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backfiring, carb adjustment, float bowl adjustment, reserve, sputtering

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  #1  
Old 7th July 2015
Steelhead760 Steelhead760 is offline
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Default bike only running on reserve even w/ full tank

So i've fixed my gen problems, my brace situation, and now to move the focus on the carb or petcock.


At about 1/2 way open on the throttle i'll get some sputtering and a lurch, it'll be so persistent that i have to pull over.

I'll flip the petcock to reserve and be able to make it home fine. light sputtering at about 1/2 but thats all.

sound like anything in particular?

It's a harley davidson CV carb from an 03'

i'm thinking it could be needing a float adjustment but that's all i can come up with.
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  #2  
Old 7th July 2015
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Checked petcock flow in both on and reserve positions?. . . what is inside on the petcock?. . a gauze screen?
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  #3  
Old 7th July 2015
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Float was my first thought. Had the same symptoms.
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  #4  
Old 7th July 2015
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Quote:
Originally Posted by russzx6 View Post
Checked petcock flow in both on and reserve positions?. . . what is inside on the petcock?. . a gauze screen?
Quote:
Originally Posted by IronMick View Post
Float was my first thought. Had the same symptoms.
Could be either one of these. Do you have an inline filter and the petcock screen? If so, lose one of them. Also, some aftermarket petcocks start to have flow issues, so checking flow is a good idea. Should run freely as a stream as wide as hose ID. If all that checks, remove gas cap to check for venting issue.

If all that checks, on to the carb/float.
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Old 7th July 2015
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I had one of those sintered bronze fuel filters for about 1/2 a second, damn thing wouldn't flow a thing
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Quote:
Originally Posted by Steelhead760 View Post
So i've fixed my gen problems, my brace situation, and now to move the focus on the carb or petcock.


At about 1/2 way open on the throttle i'll get some sputtering and a lurch, it'll be so persistent that i have to pull over.

I'll flip the petcock to reserve and be able to make it home fine. light sputtering at about 1/2 but thats all.

sound like anything in particular?

It's a harley davidson CV carb from an 03'

i'm thinking it could be needing a float adjustment but that's all i can come up with.
Drain the tank, pull the petcock,check the screen,remove any debris.
Pull the petcock apart and check the rubber diverter inside for integrity. They sometimes get swollen up from years of service and/or ethanol laden fuel that we have now days......
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  #7  
Old 7th July 2015
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Can you put a clear hose on the bowl drain, run it up the side of the carb, and open the drain? That should show you the gas level in the bowl with the bike upright.

sent with :-P
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