Fuel starvation or.....................

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Fuel starvation or.....................

Viper57
I have a 1998 Trophy 1200 and its a great motorcycle - fast, smooth, heaps of power etc etc. Such a lot of motorcycle for the money I paid for it ($3500 AUD)

BUT...................

I cannot seem to get any more out of a tank of fuel than 310 km before it starts to lose power - then it starts the whole 'fuel starvation splutter'. I coast to the side of the road, bike dies, switch to reserve - put on prime for a few seconds to fill the carbies/lines - then cough - cough - splutter - fires - then I get a few KM down the road and it starts again.

When I get to a service station the tank takes 20 litres at most so there should be 4-5 litres left

I have replaced all of the fuel and vac lines, made extra sure that they were not kinked, cleaned out the tank vent line , bought a new fuel tank cap, replaced the diaphragm / seals in the petcock using a rebuild kit from the UK (also cleaned out some gunk while it was apart), cleaned out the small mesh inline filters near the carbies.

Crank sensor replaced, new coils fitted

I am at a loss as to 'why'? should I just 'suck it up' and fill up before 300km or does anyone have some words of wisdom???

Thanks in advance

Cheers
Gary
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Re: Fuel starvation or.....................

Triumph Trophy mailing list
Have you cleaned the gauze filter inside the tank? It sits on top of the petrol cock so you have to drain the tank and remove the petrol cock assy.
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Re: Fuel starvation or.....................

Triumph Trophy mailing list
In reply to this post by Viper57
Hi Gary,
You're getting 310km (192 miles) to a tank before fuel starvation on a Trophy 1200.
I get about 167.5 miles (270km) before fuel starvation on my Trophy 1200.
Like yours, switching to RES or PRI doesn't feed fuel fast enough for me to keep the engine running long.
There is a potential issue with the air vent in the fuel cap.  The one-way valves can tend to get stuck and not allow ventilation, causing a vacuum build-up.  This is usually seen at about 1/4 tank on the fuel gauge, though.
I think that on my bike, I see an issue where the following happens:- Fuel runs out in the tank on the main circuit and I get sputtering.- I switch to PRI or RES and the bike starts back up, but I only get another 2 or 3 miles before it starts sputtering again.
I spent quite a bit of time trying to troubleshoot this, and I've arrived at the following guess after installing Tygon fuel lines that allow me to see the fuel in the lines:- The fuel lines get air in them.  When I look at the routing of my fuel lines, they must pass uphill in their transit from the petcock to the "H" behind the carburetors.  - When I fill my tank, the head pressure compresses the air and allows fuel to pass by.  Some of the air may even get pushed to the carb bowls and vented, but I don't think so.  My best bet is to disconnect the vacuum line from carb 2 and run the carbs out of gas, then manually apply vacuum to it (on a full tank).  This causes a "flush" siphon effect that pushes the air down into the carbs and out the vents.- When I run out of gas on the road, I think that there isn't enough fuel head pressure in the tank to flush the air through the lines, and I get a lingering air bubble that blocks fuel flow.
Again, this is a guess, but it does describe what I'm seeing.
Since my commute is 33 miles (53km) each way, and since I have only 3 ethanol-free fuel stations on my commute, I tend to refill every other day at 134 miles (215km).  If I rode the extra ~33 miles of a one-way trip, I'd be pushing right up against my range limit.
- Dave

 
      From: "Viper57 [hidden email] [TriumphTrophy]" <[hidden email]>
 To: [hidden email]
 Sent: Thursday, October 27, 2016 1:41 AM
 Subject: [TriumphTrophy] Fuel starvation or.....................
   
    I have a 1998 Trophy 1200 and its a great motorcycle - fast, smooth, heaps of
power etc etc. Such a lot of motorcycle for the money I paid for it ($3500
AUD)

BUT...................

I cannot seem to get any more out of a tank of fuel than 310 km before it
starts to lose power - then it starts the whole 'fuel starvation splutter'.
I coast to the side of the road, bike dies, switch to reserve - put on prime
for a few seconds to fill the carbies/lines - then cough - cough - splutter
- fires - then I get a few KM down the road and it starts again.

When I get to a service station the tank takes 20 litres at most so there
should be 4-5 litres left

I have replaced all of the fuel and vac lines, made extra sure that they
were not kinked, cleaned out the tank vent line , bought a new fuel tank
cap, replaced the diaphragm / seals in the petcock using a rebuild kit from
the UK (also cleaned out some gunk while it was apart), cleaned out the
small mesh inline filters near the carbies.

Crank sensor replaced, new coils fitted

I am at a loss as to 'why'? should I just 'suck it up' and fill up before
300km or does anyone have some words of wisdom???

Thanks in advance

Cheers
Gary

--
View this message in context: http://triumph-trophy.10955.n7.nabble.com/Fuel-starvation-or-tp38019.html
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Re: Fuel starvation or.....................

Triumph Trophy mailing list
In reply to this post by Viper57
Hi Gary!
   You are experiencing a genetic small trouble #1 with you new bike. You really should sit down, for a couple hours, and read the facts file. We are a tiny segment in motorcycle community. These Trophy years, are amazing bikes, especially, if you enjoy doing your own work. We have checked off almost everything possible, that can befall a Triumph of those early years. You have, a clog in the gas cap vent hole, an air leak in the petcock vacuum line to #4 carb. It’s the fairly dreaded, and very common, "Quarter tank = empty behavior" syndrome. You’ll find plenty about it at our group site "FAX" file. It’s Likely an easy fix. READ the files! We have gone to great lengths to talk about all (ALL!) the most common fails, and hear new owners ask the same questions over and over again. Read the file, and then if you can’t make any sense of the problem, we love to find new troubles (very-very rare!), and analyze them ad nausium (sorry fellas!), but we are a group with many who have fantastic tech wisdom in almost anything to do with these. I bought mine new, when Triumph first returned to the States, in ’95. My BMW shop got the dealership. Like most of us when I was in high school in the '60s, a small single was how most of my chums got around. We had paper routes, that we did each morning, riding a bicycle. I and my pals, could knock out our routes in half the time (collecting was the hard part!). Little by little our bikes got bigger, and faster. Some of the adult motorcyclists, in our 'hood, took pity on us, and would help us keep them all running. I was eagerly taught the basics, by the adults we knew from our paper routes, where we’d see bikes. I have really enjoyed never seeing a bike like mine in a huge rally crowd, and extremely rare out on the road. The very cool thing we’ve learned is that in the early years of Triumph’s "Rise from oblivion", that Triumph bought almost all the parts from very common vendors, for most parts. So, we can shop for parts in almost any other marquis'! Sweet! You got a lot of motorcycle there!
 Kindest regards, and welcome,
    Poppa Jack - Buena Park, Ca.

> On Oct 26, 2016, at 10:41 PM, Viper57 [hidden email] [TriumphTrophy] <[hidden email]> wrote:
>
> I have a 1998 Trophy 1200 and its a great motorcycle - fast, smooth, heaps of
> power etc etc. Such a lot of motorcycle for the money I paid for it ($3500
> AUD)
>
> BUT...................
>
> I cannot seem to get any more out of a tank of fuel than 310 km before it
> starts to lose power - then it starts the whole 'fuel starvation splutter'.
> I coast to the side of the road, bike dies, switch to reserve - put on prime
> for a few seconds to fill the carbies/lines - then cough - cough - splutter
> - fires - then I get a few KM down the road and it starts again.
>
> When I get to a service station the tank takes 20 litres at most so there
> should be 4-5 litres left
>
> I have replaced all of the fuel and vac lines, made extra sure that they
> were not kinked, cleaned out the tank vent line , bought a new fuel tank
> cap, replaced the diaphragm / seals in the petcock using a rebuild kit from
> the UK (also cleaned out some gunk while it was apart), cleaned out the
> small mesh inline filters near the carbies.
>
> Crank sensor replaced, new coils fitted
>
> I am at a loss as to 'why'? should I just 'suck it up' and fill up before
> 300km or does anyone have some words of wisdom???
>
> Thanks in advance
>
> Cheers
> Gary
>
> --
> View this message in context: http://triumph-trophy.10955.n7.nabble.com/Fuel-starvation-or-tp38019.html <http://triumph-trophy.10955.n7.nabble.com/Fuel-starvation-or-tp38019.html>
> Sent from the Triumph Trophy mailing list archive at Nabble.com <http://nabble.com/>.
>
>

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Re: Fuel starvation or.....................

Triumph Trophy mailing list
In reply to this post by Triumph Trophy mailing list
Hi Gary,

Make sure to replace all four of the small o-rings which seal the vacuum
ports below the carb tops. If possible take vacuum readings on all of the
vacuum ports before and after replacing those. Switch the take off hose to
the one that reads the highest. My guess is the petcock is only partially
opening. Which could be caused by low vacuum or a dirty petcock. Or a
combination of both. Dismantle the petcock and clean out all the micro rust
powder. Then make sure that it is completely sealed with no vacuum leaks
when reassembled. It should fully open and close with only light mouth
suction applied.

Also be careful with those take off ports as they snap off easily. One of
mine is epoxied now. Actually the next time I pull the tops I intend on
reinforcing them all with epoxy before they snap off.

Hope this helps.

Samuel
On Oct 27, 2016 7:56 AM, "[hidden email] [TriumphTrophy]" <
[hidden email]> wrote:

>
>
> Have you cleaned the gauze filter inside the tank? It sits on top of the
> petrol cock so you have to drain the tank and remove the petrol cock assy.
>
>
>
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Re: Fuel starvation or.....................

Triumph Trophy mailing list
In reply to this post by Triumph Trophy mailing list
Thanks everyone for the replies [😊]   lots to ponder on


David - I see your point about air in the fuel lines - it describes what happens to my Trophy exactly. Never thought of it that way actually


I find that if I keep the fuel tap on the 'res' position and keep an eye on the trip meter for distance travelled it allows me to travel the most distance before the issue presents itself


Again, thanks everyone for the advice/assistance


Cheers

gary


________________________________
From: [hidden email] <[hidden email]> on behalf of David Webb [hidden email] [TriumphTrophy] <[hidden email]>
Sent: 28 October 2016 00:25
To: [hidden email]
Subject: Re: [TriumphTrophy] Fuel starvation or.....................



Hi Gary,

You're getting 310km (192 miles) to a tank before fuel starvation on a Trophy 1200.

I get about 167.5 miles (270km) before fuel starvation on my Trophy 1200.

Like yours, switching to RES or PRI doesn't feed fuel fast enough for me to keep the engine running long.

There is a potential issue with the air vent in the fuel cap.  The one-way valves can tend to get stuck and not allow ventilation, causing a vacuum build-up.  This is usually seen at about 1/4 tank on the fuel gauge, though.

I think that on my bike, I see an issue where the following happens:
- Fuel runs out in the tank on the main circuit and I get sputtering.
- I switch to PRI or RES and the bike starts back up, but I only get another 2 or 3 miles before it starts sputtering again.

I spent quite a bit of time trying to troubleshoot this, and I've arrived at the following guess after installing Tygon fuel lines that allow me to see the fuel in the lines:
- The fuel lines get air in them.  When I look at the routing of my fuel lines, they must pass uphill in their transit from the petcock to the "H" behind the carburetors.
- When I fill my tank, the head pressure compresses the air and allows fuel to pass by.  Some of the air may even get pushed to the carb bowls and vented, but I don't think so.  My best bet is to disconnect the vacuum line from carb 2 and run the carbs out of gas, then manually apply vacuum to it (on a full tank).  This causes a "flush" siphon effect that pushes the air down into the carbs and out the vents.
- When I run out of gas on the road, I think that there isn't enough fuel head pressure in the tank to flush the air through the lines, and I get a lingering air bubble that blocks fuel flow.

Again, this is a guess, but it does describe what I'm seeing.

Since my commute is 33 miles (53km) each way, and since I have only 3 ethanol-free fuel stations on my commute, I tend to refill every other day at 134 miles (215km).  If I rode the extra ~33 miles of a one-way trip, I'd be pushing right up against my range limit.

- Dave

________________________________
From: "Viper57 [hidden email] [TriumphTrophy]" <[hidden email]>
To: [hidden email]
Sent: Thursday, October 27, 2016 1:41 AM
Subject: [TriumphTrophy] Fuel starvation or.....................


I have a 1998 Trophy 1200 and its a great motorcycle - fast, smooth, heaps of
power etc etc. Such a lot of motorcycle for the money I paid for it ($3500
AUD)

BUT...................

I cannot seem to get any more out of a tank of fuel than 310 km before it
starts to lose power - then it starts the whole 'fuel starvation splutter'.
I coast to the side of the road, bike dies, switch to reserve - put on prime
for a few seconds to fill the carbies/lines - then cough - cough - splutter
- fires - then I get a few KM down the road and it starts again.

When I get to a service station the tank takes 20 litres at most so there
should be 4-5 litres left

I have replaced all of the fuel and vac lines, made extra sure that they
were not kinked, cleaned out the tank vent line , bought a new fuel tank
cap, replaced the diaphragm / seals in the petcock using a rebuild kit from
the UK (also cleaned out some gunk while it was apart), cleaned out the
small mesh inline filters near the carbies.

Crank sensor replaced, new coils fitted

I am at a loss as to 'why'? should I just 'suck it up' and fill up before
300km or does anyone have some words of wisdom???

Thanks in advance

Cheers
Gary

--
View this message in context: http://triumph-trophy.10955.n7.nabble.com/Fuel-starvation-or-tp38019.html
Sent from the Triumph Trophy mailing list archive at Nabble.com.





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Re: Fuel starvation or.....................

Triumph Trophy mailing list
In reply to this post by Triumph Trophy mailing list
Thanks samuel


the 'o' rings you mentioned on the vacuum ports - are they standard fittings? mine didnt have them on any of the vacuum ports, just a combination of OEM ones and two new ones


Do they fit under the caps?


________________________________
From: [hidden email] <[hidden email]> on behalf of Samuel Crider [hidden email] [TriumphTrophy] <[hidden email]>
Sent: 28 October 2016 00:31
To: [hidden email]
Subject: Re: [TriumphTrophy] Re: Fuel starvation or.....................



Hi Gary,

Make sure to replace all four of the small o-rings which seal the vacuum ports below the carb tops. If possible take vacuum readings on all of the vacuum ports before and after replacing those. Switch the take off hose to the one that reads the highest. My guess is the petcock is only partially opening. Which could be caused by low vacuum or a dirty petcock. Or a combination of both. Dismantle the petcock and clean out all the micro rust powder. Then make sure that it is completely sealed with no vacuum leaks when reassembled. It should fully open and close with only light mouth suction applied.

Also be careful with those take off ports as they snap off easily. One of mine is epoxied now. Actually the next time I pull the tops I intend on reinforcing them all with epoxy before they snap off.

Hope this helps.

Samuel

On Oct 27, 2016 7:56 AM, "[hidden email]<mailto:[hidden email]> [TriumphTrophy]" <[hidden email]<mailto:[hidden email]>> wrote:


Have you cleaned the gauze filter inside the tank? It sits on top of the petrol cock so you have to drain the tank and remove the petrol cock assy.



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Re: Fuel starvation or.....................

Triumph Trophy mailing list
In reply to this post by Triumph Trophy mailing list
Hi Gary,
One note:
My bike had a rust problem in the fuel tank that had been "fixed" with a badly applied liner.  In other words, it had a rust problem and a liner problem.  I addressed it with a pressure washer, electrolysis, and rust-converter.
I did this because my bike also has another problem.  The fuel tap has a "screen that is intended to keep debris in the fuel tank and not in the fuel tap or carburetors.  Your bike was also built with a last-resort measure of 2 screens installed at the inlets of the tees between your #1/#2, and #3/#4 carburetors.  A previous owner had removed the screens from my bike in an effort to improve fuel flow.
So, the fuel screen is a solid dual-chamber part with one chamber that is stepped up about 2.5cm and the other chamber is open at the bottom.  On the stepped-up chamber, it has an o-ring around the nipple that fits into the fuel tap port for the ON position on the fuel tap.  For the PRI and RES positions, it just relies on a somewhat flush fit in it's recess on the top of the fuel tap extension adapter.
On my bike, the fuel screen appears to be completely intact and in-spec, but debris in my fuel tank can slip under the base of the fuel screen into the PRI and RES side of the fuel screen.  If my fuel tap is drawing fuel on PRI or RES, that debris can be sucked into the fuel tap and then towards the carburetors.
Three things can happen:1. The fuel tap can get stuck open.  This is the same as running on PRI all the time.2. The debris can clog the screens between the carburetors.3. If a previous owner removed those screens, the debris can cause the float needles in the carburetors to become stuck open.
If 1 happens by itself, no big issue.If 2 happens, your bike will start to develop fuel starvation issues at anything other than leisurely speeds.If 3 happens, your fuel lines will empty into your stuck carburetor while your engine is running, and you will have fuel economy and performance issues.If 1 & 3 happen at the same time, or if 3 happens and you leave it on PRI, then your fuel tank will drain into the offending carburetor, and then the fuel will run downhill into the engine, where it will cause a hydraulic lock.  This can cause serious mechanical problems if you try to start your engine with a hydraulic lock, including sprag clutch failure, or holed pistons.
I got lucky.  I discovered the issue and when I stupidly tried to start my engine, it didn't cause catastrophic damage.  After an oil change, carburetors rebuild, and fuel system clean-up, my bike runs close to perfectly.
But - I don't like to run on RES.
Just a thought...
- Dave

 
      From: "Gary Vesper [hidden email] [TriumphTrophy]" <[hidden email]>
 To: "[hidden email]" <[hidden email]>
 Sent: Thursday, October 27, 2016 5:15 PM
 Subject: Re: [TriumphTrophy] Fuel starvation or.....................
   
    Thanks everyone for the replies   lots to ponder on
David - I see your point about air in the fuel lines - it describes what happens to my Trophy exactly. Never thought of it that way actually
I find that if I keep the fuel tap on the 'res' position and keep an eye on the trip meter for distance travelled it allows me to travel the most distance before the issue presents itself

Again, thanks everyone for the advice/assistance
Cheersgary


From: [hidden email] <[hidden email]> on behalf of David Webb [hidden email] [TriumphTrophy] <[hidden email]>
Sent: 28 October 2016 00:25
To: [hidden email]
Subject: Re: [TriumphTrophy] Fuel starvation or.....................  Hi Gary,
You're getting 310km (192 miles) to a tank before fuel starvation on a Trophy 1200.
I get about 167.5 miles (270km) before fuel starvation on my Trophy 1200.
Like yours, switching to RES or PRI doesn't feed fuel fast enough for me to keep the engine running long.
There is a potential issue with the air vent in the fuel cap.  The one-way valves can tend to get stuck and not allow ventilation, causing a vacuum build-up.  This is usually seen at about 1/4 tank on the fuel gauge, though.
I think that on my bike, I see an issue where the following happens:- Fuel runs out in the tank on the main circuit and I get sputtering.- I switch to PRI or RES and the bike starts back up, but I only get another 2 or 3 miles before it starts sputtering again.
I spent quite a bit of time trying to troubleshoot this, and I've arrived at the following guess after installing Tygon fuel lines that allow me to see the fuel in the lines:- The fuel lines get air in them.  When I look at the routing of my fuel lines, they must pass uphill in their transit from the petcock to the "H" behind the carburetors.  - When I fill my tank, the head pressure compresses the air and allows fuel to pass by.  Some of the air may even get pushed to the carb bowls and vented, but I don't think so.  My best bet is to disconnect the vacuum line from carb 2 and run the carbs out of gas, then manually apply vacuum to it (on a full tank).  This causes a "flush" siphon effect that pushes the air down into the carbs and out the vents.- When I run out of gas on the road, I think that there isn't enough fuel head pressure in the tank to flush the air through the lines, and I get a lingering air bubble that blocks fuel flow.
Again, this is a guess, but it does describe what I'm seeing.
Since my commute is 33 miles (53km) each way, and since I have only 3 ethanol-free fuel stations on my commute, I tend to refill every other day at 134 miles (215km).  If I rode the extra ~33 miles of a one-way trip, I'd be pushing right up against my range limit.
- Dave


From: "Viper57 [hidden email] [TriumphTrophy]" <[hidden email]>
To: [hidden email]
Sent: Thursday, October 27, 2016 1:41 AM
Subject: [TriumphTrophy] Fuel starvation or.....................

 I have a 1998 Trophy 1200 and its a great motorcycle - fast, smooth, heaps of
power etc etc. Such a lot of motorcycle for the money I paid for it ($3500
AUD)

BUT...................

I cannot seem to get any more out of a tank of fuel than 310 km before it
starts to lose power - then it starts the whole 'fuel starvation splutter'.
I coast to the side of the road, bike dies, switch to reserve - put on prime
for a few seconds to fill the carbies/lines - then cough - cough - splutter
- fires - then I get a few KM down the road and it starts again.

When I get to a service station the tank takes 20 litres at most so there
should be 4-5 litres left

I have replaced all of the fuel and vac lines, made extra sure that they
were not kinked, cleaned out the tank vent line , bought a new fuel tank
cap, replaced the diaphragm / seals in the petcock using a rebuild kit from
the UK (also cleaned out some gunk while it was apart), cleaned out the
small mesh inline filters near the carbies.

Crank sensor replaced, new coils fitted

I am at a loss as to 'why'? should I just 'suck it up' and fill up before
300km or does anyone have some words of wisdom???

Thanks in advance

Cheers
Gary

--
View this message in context: http://triumph-trophy.10955.n7.nabble.com/Fuel-starvation-or-tp38019.html
Sent from the Triumph Trophy mailing list archive at Nabble.com.



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Re: Fuel starvation or.....................

Triumph Trophy mailing list
In reply to this post by Triumph Trophy mailing list
Hi Gary,
These o-rings are underneath the carburetor caps.  They seal the vacuum port to the top of the carburetor body.
- Dave

 
      From: "Gary Vesper [hidden email] [TriumphTrophy]" <[hidden email]>
 To: "[hidden email]" <[hidden email]>
 Sent: Thursday, October 27, 2016 5:16 PM
 Subject: Re: [TriumphTrophy] Re: Fuel starvation or.....................
   
    Thanks samuel
the 'o' rings you mentioned on the vacuum ports - are they standard fittings? mine didnt have them on any of the vacuum ports, just a combination of OEM ones and two new ones
Do they fit under the caps?


From: [hidden email] <[hidden email]> on behalf of Samuel Crider [hidden email] [TriumphTrophy] <[hidden email]>
Sent: 28 October 2016 00:31
To: [hidden email]
Subject: Re: [TriumphTrophy] Re: Fuel starvation or.....................  Hi Gary,Make sure to replace all four of the small o-rings which seal the vacuum ports below the carb tops. If possible take vacuum readings on all of the vacuum ports before and after replacing those. Switch the take off hose to the one that reads the highest. My guess is the petcock is only partially opening. Which could be caused by low vacuum or a dirty petcock. Or a combination of both. Dismantle the petcock and clean out all the micro rust powder. Then make sure that it is completely sealed with no vacuum leaks when reassembled. It should fully open and close with only light mouth suction applied. Also be careful with those take off ports as they snap off easily. One of mine is epoxied now. Actually the next time I pull the tops I intend on reinforcing them all with epoxy before they snap off.Hope this helps.SamuelOn Oct 27, 2016 7:56 AM, "[hidden email] [TriumphTrophy]" <[hidden email]> wrote:



Have you cleaned the gauze filter inside the tank? It sits on top of the petrol cock so you have to drain the tank and remove the petrol cock assy.


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Re: Fuel starvation or.....................

Triumph Trophy mailing list
Thanks Dave


I will have a look at those o rings tonight


and yes I did clean the gauze filter in the fuel tank [😊]


cheers

Gary


________________________________
From: [hidden email] <[hidden email]> on behalf of David Webb [hidden email] [TriumphTrophy] <[hidden email]>
Sent: 28 October 2016 11:48
To: [hidden email]
Subject: Re: [TriumphTrophy] Re: Fuel starvation or.....................



Hi Gary,

These o-rings are underneath the carburetor caps.  They seal the vacuum port to the top of the carburetor body.

- Dave


________________________________
From: "Gary Vesper [hidden email] [TriumphTrophy]" <[hidden email]>
To: "[hidden email]" <[hidden email]>
Sent: Thursday, October 27, 2016 5:16 PM
Subject: Re: [TriumphTrophy] Re: Fuel starvation or.....................


Thanks samuel

the 'o' rings you mentioned on the vacuum ports - are they standard fittings? mine didnt have them on any of the vacuum ports, just a combination of OEM ones and two new ones

Do they fit under the caps?


________________________________
From: [hidden email] <[hidden email]> on behalf of Samuel Crider [hidden email] [TriumphTrophy] <[hidden email]>
Sent: 28 October 2016 00:31
To: [hidden email]
Subject: Re: [TriumphTrophy] Re: Fuel starvation or.....................


Hi Gary,
Make sure to replace all four of the small o-rings which seal the vacuum ports below the carb tops. If possible take vacuum readings on all of the vacuum ports before and after replacing those. Switch the take off hose to the one that reads the highest. My guess is the petcock is only partially opening. Which could be caused by low vacuum or a dirty petcock. Or a combination of both. Dismantle the petcock and clean out all the micro rust powder. Then make sure that it is completely sealed with no vacuum leaks when reassembled. It should fully open and close with only light mouth suction applied.
Also be careful with those take off ports as they snap off easily. One of mine is epoxied now. Actually the next time I pull the tops I intend on reinforcing them all with epoxy before they snap off.
Hope this helps.
Samuel
On Oct 27, 2016 7:56 AM, "[hidden email]<mailto:[hidden email]> [TriumphTrophy]" <[hidden email]<mailto:[hidden email]>> wrote:


Have you cleaned the gauze filter inside the tank? It sits on top of the petrol cock so you have to drain the tank and remove the petrol cock assy.






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Re: Fuel starvation or.....................

Triumph Trophy mailing list
In reply to this post by Triumph Trophy mailing list
They are under the black caps. And they tend to cook first being so close
to the head. They are quite small and easy to dislodge on reassembly. I
couldn't source them from the parts stores and had to order them. But check
with the Suzuki and Kawasaki shops and you might get lucky.

Samuel
On Oct 27, 2016 4:24 PM, "Gary Vesper [hidden email]
[TriumphTrophy]" <[hidden email]> wrote:

>
>
> Thanks samuel
>
>
> the 'o' rings you mentioned on the vacuum ports - are they standard
> fittings? mine didnt have them on any of the vacuum ports, just a
> combination of OEM ones and two new ones
>
>
> Do they fit under the caps?
>
>
> ------------------------------
> *From:* [hidden email] <[hidden email]> on
> behalf of Samuel Crider [hidden email] [TriumphTrophy] <
> [hidden email]>
> *Sent:* 28 October 2016 00:31
> *To:* [hidden email]
> *Subject:* Re: [TriumphTrophy] Re: Fuel starvation or.....................
>
>
>
> Hi Gary,
>
> Make sure to replace all four of the small o-rings which seal the vacuum
> ports below the carb tops. If possible take vacuum readings on all of the
> vacuum ports before and after replacing those. Switch the take off hose to
> the one that reads the highest. My guess is the petcock is only partially
> opening. Which could be caused by low vacuum or a dirty petcock. Or a
> combination of both. Dismantle the petcock and clean out all the micro rust
> powder. Then make sure that it is completely sealed with no vacuum leaks
> when reassembled. It should fully open and close with only light mouth
> suction applied.
>
> Also be careful with those take off ports as they snap off easily. One of
> mine is epoxied now. Actually the next time I pull the tops I intend on
> reinforcing them all with epoxy before they snap off.
>
> Hope this helps.
>
> Samuel
> On Oct 27, 2016 7:56 AM, "[hidden email] [TriumphTrophy]" <
> [hidden email]> wrote:
>
>>
>>
>> Have you cleaned the gauze filter inside the tank? It sits on top of the
>> petrol cock so you have to drain the tank and remove the petrol cock assy.
>>
>>
>
>
>
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Re: Fuel starvation or.....................

Triumph Trophy mailing list
In reply to this post by Viper57
It ain't broke. They were like that from new. Many spend time trying to "fix it". As standard mine would never do more than 60mph when on reserve without starving.

Sent from my iPhone

> On 27 Oct 2016, at 06:41, Viper57 [hidden email] [TriumphTrophy] <[hidden email]> wrote:
>
> I have a 1998 Trophy 1200 and its a great motorcycle - fast, smooth, heaps of
> power etc etc. Such a lot of motorcycle for the money I paid for it ($3500
> AUD)
>
> BUT...................
>
> I cannot seem to get any more out of a tank of fuel than 310 km before it
> starts to lose power - then it starts the whole 'fuel starvation splutter'.
> I coast to the side of the road, bike dies, switch to reserve - put on prime
> for a few seconds to fill the carbies/lines - then cough - cough - splutter
> - fires - then I get a few KM down the road and it starts again.
>
> When I get to a service station the tank takes 20 litres at most so there
> should be 4-5 litres left
>
> I have replaced all of the fuel and vac lines, made extra sure that they
> were not kinked, cleaned out the tank vent line , bought a new fuel tank
> cap, replaced the diaphragm / seals in the petcock using a rebuild kit from
> the UK (also cleaned out some gunk while it was apart), cleaned out the
> small mesh inline filters near the carbies.
>
> Crank sensor replaced, new coils fitted
>
> I am at a loss as to 'why'? should I just 'suck it up' and fill up before
> 300km or does anyone have some words of wisdom???
>
> Thanks in advance
>
> Cheers
> Gary
>
> --
> View this message in context: http://triumph-trophy.10955.n7.nabble.com/Fuel-starvation-or-tp38019.html
> Sent from the Triumph Trophy mailing list archive at Nabble.com.
>
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Re: Fuel starvation or.....................

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Hi Nigel, Yours is broke. Greg
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Re: Fuel starvation or.....................

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How does the bike run with a full tank with the fuel switch on reserve? I'll be trying that myself actually, as my fuel switch is broken at present. I'm sure I've heard of people who run it like that.
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Re: Fuel starvation or.....................

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Greg, so was the 97 I also bought brand new.

Sent from my iPhone

> On 30 Oct 2016, at 03:46, [hidden email] [TriumphTrophy] <[hidden email]> wrote:
>
> Hi Nigel, Yours is broke.
>
> Greg
>
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Re: Fuel starvation or.....................

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In reply to this post by Viper57

   
I would think, for full volume and fuel flow "on" would be the optimum position to ride on.
Bob


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-------- Original message --------
From: "[hidden email] [TriumphTrophy]" <[hidden email]>
Date: 10/30/16  2:17 AM  (GMT-05:00)
To: [hidden email]
Subject: Re: [TriumphTrophy] Fuel starvation or.....................


 



 


   
     
     
      How does the bike run with a full tank with the fuel switch on reserve? I'll be trying that myself actually, as my fuel switch is broken at present. I'm sure I've heard of people who run it like that. 

   
     

   
   


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Re: Fuel starvation or.....................

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Because the petrol is denser than air you will find that, irrespective of air bubbles in the line, the fuel will always pass by the trapped air, it does not need to force the air out, it will simply flow by it. Try with an old wash liquid bottle and clear pipe to see if you can make trapped bubbles prevent flow!

Regards
Ivor
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Re: Fuel starvation or.....................

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Mine hasn't moved off reserve now for years. Still will do a good 140 if
desired. I rarely run under a quarter tank just out of habit. No starvation
issues since the last service. I think using fuel injection rated fuel hose
for the vacuum line helped as well. No kinking or collapsing stunts and
will last as its much thicker.

Samuel
On Oct 30, 2016 7:55 AM, "[hidden email] [TriumphTrophy]" <
[hidden email]> wrote:

>
>
> How does the bike run with a full tank with the fuel switch on reserve?
> I'll be trying that myself actually, as my fuel switch is broken at
> present. I'm sure I've heard of people who run it like that.
>
>
>
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