Throttle Woes Pt. 2

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Throttle Woes Pt. 2

Bud Izen
Okay, I just pulled the carbs off the bike and had a look, and now I am
more puzzled than before.

A couple of guys weighed in and said I should be capable of rotating the
twist grip approximately 90 degrees. So, if we think about it, that
means that the butterflies should likewise rotate 90 degrees.

Well, I pushed down on the throttle block where the throttle cable
connects to the carbs, and, looking inside, it is clear that the
butterflies (all 3 in perfect sync) only open about 45 degrees. They
close all the way down, just fine, but there is no way that I can see to
get them to move any further.

My basic problem is that it has been several years since I had the carbs
off the bike and I have no recall whatsoever as to what normal operation
might have looked like before the bike developed the issue it has now.

So, for any of you with a set of carbs available, can someone please
look inside and ascertain approximately how many degrees the butterflies
open? Closer to 90 (which means they would be lying almost flat,
parallel to the ground when fully open) or closer to 45 degrees
(obviously about half way between completely closed and completely open
parallel to the ground). I cannot see anything that is keeping them from
opening up further, nor can I see how they could open any further.
Something is certainly wrong somewhere, but without a known good set of
carbs to look at, I am at full stop for the moment.

I did spray the throttle mechanism and springs with carb cleaner, and
that certainly helped them move more freely, but there wasn't much of
difference in ease of movement and certainly no difference in range of
motion.

Assistance will be greatly appreciated.


Bud Izen

'99 Platinum 900

Springfield OR


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RE: Throttle Woes Pt. 2

JohnM
Hi Bud
I haven’t conversed with you for a while. I hoe things are well with you.
The carb butterfly’s should be presenting the least amount of resistance to airflow in the venturi at wide open throttle (WOT). Therefore, they should be parallel to the ground at WOT in your terminology.
There are two things that could be happening. Something restricting the linkage mechanism of the carb rack or the spindles on the butterfly’s are seizing at about 45 degrees. The butterfly’s should be able to be opened easily to full open and should “Snap” back very quickly when let go. I would suggest by your symptoms the spindles are binding and need to be freed. Mine did start to bind up at about 45deg a while ago but I lubricated the spindles and cable until they freed up again. No problem ever since.  When you think about it, we (generally) only ever open the throttles to about 45deg 90% of the time so they may gum up or “gall” for the remainder of the travel. (I know there are a few on this forum who probably invert this ratio)
Some of our LAM’s (Learner Approved Motorcycle) bikes in Aus. do have a butterfly restrictor to prevent full power but I don’t think this would apply in your case.

Cheers
JohnM
’96 BBBB Pacific Blue

From: [hidden email] <[hidden email]>
Sent: Wednesday, 23 May 2018 5:49 AM
To: [hidden email]
Subject: [TriumphTrophy] Throttle Woes Pt. 2



Okay, I just pulled the carbs off the bike and had a look, and now I am
more puzzled than before.

A couple of guys weighed in and said I should be capable of rotating the
twist grip approximately 90 degrees. So, if we think about it, that
means that the butterflies should likewise rotate 90 degrees.

Well, I pushed down on the throttle block where the throttle cable
connects to the carbs, and, looking inside, it is clear that the
butterflies (all 3 in perfect sync) only open about 45 degrees. They
close all the way down, just fine, but there is no way that I can see to
get them to move any further.

My basic problem is that it has been several years since I had the carbs
off the bike and I have no recall whatsoever as to what normal operation
might have looked like before the bike developed the issue it has now.

So, for any of you with a set of carbs available, can someone please
look inside and ascertain approximately how many degrees the butterflies
open? Closer to 90 (which means they would be lying almost flat,
parallel to the ground when fully open) or closer to 45 degrees
(obviously about half way between completely closed and completely open
parallel to the ground). I cannot see anything that is keeping them from
opening up further, nor can I see how they could open any further.
Something is certainly wrong somewhere, but without a known good set of
carbs to look at, I am at full stop for the moment.

I did spray the throttle mechanism and springs with carb cleaner, and
that certainly helped them move more freely, but there wasn't much of
difference in ease of movement and certainly no difference in range of
motion.

Assistance will be greatly appreciated.


Bud Izen

'99 Platinum 900

Springfield OR


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Re: Throttle Woes Pt. 2

IVOR COLLINS
In reply to this post by Bud Izen
Why don't you open the twistgrip, remove the cable and pull it as far as you can with pliers. If the butterflies are all the way open at 90degrees you will know the cable and carbs are okay

Ivor
--------------------------------------------
On Tue, 22/5/18, Bud Izen [hidden email] [TriumphTrophy] <[hidden email]> wrote:

 Subject: [TriumphTrophy] Throttle Woes Pt. 2
 To: "[hidden email]" <[hidden email]>
 Date: Tuesday, 22 May, 2018, 20:49
 
 
  
 
 
 
   
 
 
     
       
       
       Okay, I just pulled the carbs off the bike and had
 a look, and now I am
 
 
 more puzzled than before.
 
 
 
 
 
 A couple of guys weighed in and said I should be capable of
 rotating the
 
 
 twist grip approximately 90 degrees. So, if we think about
 it, that
 
 
 means that the butterflies should likewise rotate 90
 degrees.
 
 
 
 
 
 Well, I pushed down on the throttle block where the throttle
 cable
 
 
 connects to the carbs, and, looking inside, it is clear that
 the
 
 
 butterflies (all 3 in perfect sync) only open about 45
 degrees. They
 
 
 close all the way down, just fine, but there is no way that
 I can see to
 
 
 get them to move any further.
 
 
 
 
 
 My basic problem is that it has been several years since I
 had the carbs
 
 
 off the bike and I have no recall whatsoever as to what
 normal operation
 
 
 might have looked like before the bike developed the issue
 it has now.
 
 
 
 
 
 So, for any of you with a set of carbs available, can
 someone please
 
 
 look inside and ascertain approximately how many degrees the
 butterflies
 
 
 open? Closer to 90 (which means they would be lying almost
 flat,
 
 
 parallel to the ground when fully open) or closer to 45
 degrees
 
 
 (obviously about half way between completely closed and
 completely open
 
 
 parallel to the ground). I cannot see anything that is
 keeping them from
 
 
 opening up further, nor can I see how they could open any
 further.
 
 
 Something is certainly wrong somewhere, but without a known
 good set of
 
 
 carbs to look at, I am at full stop for the moment.
 
 
 
 
 
 I did spray the throttle mechanism and springs with carb
 cleaner, and
 
 
 that certainly helped them move more freely, but there
 wasn't much of
 
 
 difference in ease of movement and certainly no difference
 in range of
 
 
 motion.
 
 
 
 
 
 Assistance will be greatly appreciated.
 
 
 
 
 
 
 
 
 Bud Izen
 
 
 
 
 
 '99 Platinum 900
 
 
 
 
 
 Springfield OR
 
 
 
 
 
 
 
 
 ---
 
 
 This email has been checked for viruses by Avast antivirus
 software.
 
 
 https://www.avast.com/antivirus
 
 
 
 
 
 
 
     
     
 
     
     
 
 
 
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