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Runs on choke, Dies as soon as I pull the throttle...

  • Thread starter Thread starter Higgibaby
  • Start date Start date
H

Higgibaby

Guest
Ok, Ive just done rebuilding my bike...I've got everything ready to go...I fired it up for the first time tonight and she started well...with the choke out, but as soon as I pull the throttle to rev the engine....it dies, or loses revs...any ideas?
 
Aparently getting everything ready to go did not include cleaning the carburetors thoroughly.

They need it.
 
Higgibaby said:
If you haven't got anything useful to say and all you can do is sarcasm...stay off the forums!
Click to expand...
There is usually no extra charge for sarcasm. :o

Congratulations, you have just alienated two of the more-prominent assets on the forum. :eek:

Good luck with your project. :-\\\

.
 
They are both right and it sounds like something wasn't done properly. However, I'll add one point here - is the airbox on?
 
cowboyup3371 said:
They are both right and it sounds like something wasn't done properly. However, I'll add one point here - is the airbox on?
Click to expand...
A couple of points here:
1. You are "done rebuilding my bike". What all got "rebuilt"? Some guys go through all the cosmetics and call it a "rebuild". Other guys will do a frame-off restoration, refreshing or replacing virtually every part on the bike and call that a "rebuild". What all did you do? The focus here would be on engine maintenance, specifically valve adjustment and carb work.
2. Although the engine will start and run without the airbox, any attempts to add throttle will make it stumble and die. Adding 'pod' filters will help, but the carbs will have to be re-jetted to re-gain anything resembling 'proper' operation.

I will join Steve in wishing you good luck with your project and let you know that in the process of alienating those two first responders, you have lost access to some valuable experience. I doubt that either one of them will answer any of your questions, probably including the time of day.
 
Any or every time I have asked for help around here Tken had has always been one of the first to reply and has nailed solving my problems every time , based on what little information or knowledge I have provided ..remember people here are taking there time to help you out !!
 
Datsa Noydb said:
A couple of points here:
1. You are "done rebuilding my bike". What all got "rebuilt"? Some guys go through all the cosmetics and call it a "rebuild". Other guys will do a frame-off restoration, refreshing or replacing virtually every part on the bike and call that a "rebuild". What all did you do? The focus here would be on engine maintenance, specifically valve adjustment and carb work.
2. Although the engine will start and run without the airbox, any attempts to add throttle will make it stumble and die. Adding 'pod' filters will help, but the carbs will have to be re-jetted to re-gain anything resembling 'proper' operation.

I will join Steve in wishing you good luck with your project and let you know that in the process of alienating those two first responders, you have lost access to some valuable experience. I doubt that either one of them will answer any of your questions, probably including the time of day.
Click to expand...

It was a rebuild, a complete strip to the frame...I repainted and replaced everything virtually, new nuts/bolts, no the carbs were in good shape before hand and the bike ran beautifully before I stripped it...(always the case...lol) I have tried with both the airbox on and off and it's the same deal...fuel is definitely getting in, but I will look at the carbs again this weekend and clean them again just incase I missed something. As for the engine I didn't touch that, I actually left that alone other than move it out of the frame to paint it...mechanically apart from the carbs it wasn't touched.

As for alienating, I needed, need help and if some guy is just going to troll around forums and just not be helpful or sarcastic, then don't say anything at all! That's all I was saying!
 
Do your valve lash adjustments, make sure you have good boots on your carbs (both ends), and good O-rings on the intake boots. Make sure your airbox is properly sealed. Any vacuum leaks (is your vacuum line to the petcock good and attached?) will cause the problem you're describing. I thought had rebuilt the engine from your original post.
 
Higgibaby said:
It was a rebuild, a complete strip to the frame...I repainted and replaced everything virtually, new nuts/bolts, no the carbs were in good shape before hand and the bike ran beautifully before I stripped it...(always the case...lol) I have tried with both the airbox on and off and it's the same deal...fuel is definitely getting in, but I will look at the carbs again this weekend and clean them again just incase I missed something. As for the engine I didn't touch that, I actually left that alone other than move it out of the frame to paint it...mechanically apart from the carbs it wasn't touched.

As for alienating, I needed, need help and if some guy is just going to troll around forums and just not be helpful or sarcastic, then don't say anything at all! That's all I was saying!
Click to expand...

If you cant handle a little sarcasm , this garage is the wrong place to be !! . The very first reply from Tken02 told you whats wrong ... carb issue !!
Good luck with your project ..:D
 
DanTheMan said:
Do your valve lash adjustments, make sure you have good boots on your carbs (both ends), and good O-rings on the intake boots. Make sure your airbox is properly sealed. Any vacuum leaks (is your vacuum line to the petcock good and attached?) will cause the problem you're describing. I thought had rebuilt the engine from your original post.
Click to expand...

I did check the boots on the manifold and carbs, they seem to be in good shape...I will check the vacuum lines tonight and make sure it's all sealed....I will also take the carbs off (again), I do have some new orings I can replace, although they seemed quite good when I checked, but I'll try anything right now...have to ride by Father's Day!
 
lrgguy said:
If you cant handle a little sarcasm , this garage is the wrong place to be !! . The very first reply from Tken02 told you whats wrong ... carb issue !!
Good luck with your project ..:D
Click to expand...

It was the part where he said **** off after I mentioned his sarcasm! I can handle sarcasm, but being told to **** off....nah
 
Well now that the pleasantries are over, how long did bike sit idle while you did this work? Removing carbs (that ran well) disturbs boots - might seal poorly now. And why did you ultrasonically clean carbs, if they were running right before? Did you remove the idle/air mixture screw stuff (hidden under plug) on each carb prior to bath?
 
My first time I had to clean and rebuild the carbs twice before the bike ran properly...Missed the idle/air mixture screw the first time around. Also did you do a bench sync after the rebuild?
 
Must be carbs

Must be carbs

I'm working through the same problem:

https://www.youtube.com/watch?v=iDTGHHz0G8Y

See my blog: GS1150 ES

I've been working on the theory that I assembled the needles incorrectly (spring on top instead of on the bottom of the needle AND that the float valves were worn to the point where I had adjusted the tangs on the floats way too much:

P1100711.jpg


This week I have put in new valves which allow my float tangs to be almost flat (which is what most carbs are) and give the required float height.

I haven't put the carbs back on yet but I will do this weekend.

I'll let you know how it goes.

I'd say definitely carbs. They may not be dirty but main jets are not working for some reason.

Greetings
 
londonboards said:
I'm working through the same problem:

https://www.youtube.com/watch?v=iDTGHHz0G8Y

See my blog: GS1150 ES

I've been working on the theory that I assembled the needles incorrectly (spring on top instead of on the bottom of the needle AND that the float valves were worn to the point where I had adjusted the tangs on the floats way too much:

P1100711.jpg


This week I have put in new valves which allow my float tangs to be almost flat (which is what most carbs are) and give the required float height.

I haven't put the carbs back on yet but I will do this weekend.

I'll let you know how it goes.

I'd say definitely carbs. They may not be dirty but main jets are not working for some reason.

Greetings
Click to expand...

Richard,

I follow your blog a lot, it was kind off my inspiration to restore my bike like your dad's GS! I used to live just outside of Canterbury as well, now I'm in the states!

This problem is baffling me so I'm looking to really go through the carbs again this weekend
 
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