Carb issues
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Joined: Dec 2009
Posts: 52
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From: Houston,Tx
Carb issues
Im posting this here because I posted on the carb board first and had no responses in over a week.
As the title reads I have an 05 sporty that is carbed. The bike has been sitting for about a year so today I opened up the carb and cleaned her out. Took the bowl off and cleaned and basically "pressure washed" the entire carb with carb cleaner and compressed air.
The bike fired right up but did not want to idle so I tried giving it throttle and it just kept dieing. Finally I figure out if I would just rev it back and forth instead of holding the throttle open it that it would stay alive and finally it warmed up enough to idle.
Well it is idling like crap and if I try to slowly accelerate the throttle the bike stumbles and backfires out of the carb. When I just rev it by flicking my wrist but not holding it the bike sounds fine and doesnt stumble.
Any ideas? Help is greatly appreciated.
As the title reads I have an 05 sporty that is carbed. The bike has been sitting for about a year so today I opened up the carb and cleaned her out. Took the bowl off and cleaned and basically "pressure washed" the entire carb with carb cleaner and compressed air.
The bike fired right up but did not want to idle so I tried giving it throttle and it just kept dieing. Finally I figure out if I would just rev it back and forth instead of holding the throttle open it that it would stay alive and finally it warmed up enough to idle.
Well it is idling like crap and if I try to slowly accelerate the throttle the bike stumbles and backfires out of the carb. When I just rev it by flicking my wrist but not holding it the bike sounds fine and doesnt stumble.
Any ideas? Help is greatly appreciated.
Cruiser
Joined: Mar 2014
Posts: 218
Likes: 1
From: Michigan
Assuming you cleaned out the jets and stuff. Did you properly set the idle SPEED screw? Has the idle MIX screw cap been opened up yet? Is the carb seated properly? Intake seals shot?
Also check your battery cables. Are they clean and tight? I chased "fuel" problems for months before I found my battery cables were loose.
Also check your battery cables. Are they clean and tight? I chased "fuel" problems for months before I found my battery cables were loose.
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Joined: Dec 2009
Posts: 52
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From: Houston,Tx
I never took the carb off the bike, i just just took it aparty while mounted. Popped off the bowl and cleaned each part individually with air pressure and carb cleaner. Everything seems to be seating normally. I did not mess with the speed screw. If I revv it past 3k it backfires through the carb and it just doesnt want to stay running.
Club Member
Joined: Feb 2007
Posts: 16,320
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From: Boynton Beach, FloriDuh
I never took the carb off the bike, i just just took it aparty while mounted. Popped off the bowl and cleaned each part individually with air pressure and carb cleaner. Everything seems to be seating normally. I did not mess with the speed screw. If I revv it past 3k it backfires through the carb and it just doesnt want to stay running.
It sounds like your pilot jet circuit is plugged up.
FYI, keeping it running by twisting the throttle open & closed only proves that the accelerator pump is working.
Cruiser
Joined: Aug 2009
Posts: 160
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Sorry, but it would probably take a magician to properly clean the carb without removing it from the bike and then completely disassembling it.
It sounds like your pilot jet circuit is plugged up.
FYI, keeping it running by twisting the throttle open & closed only proves that the accelerator pump is working.
It sounds like your pilot jet circuit is plugged up.
FYI, keeping it running by twisting the throttle open & closed only proves that the accelerator pump is working.
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Joined: Dec 2009
Posts: 52
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From: Houston,Tx
What parts are blocked by the carb being on the bike? I was able to pull out all of the jets and clean the ports they were in with no problem, unless I am missing something and there are more than two jets?
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Road Master
Joined: Jul 2011
Posts: 1,030
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From: Calgary AB
you didn't pull it slightly, out of the carb to manifold seal? Or the seal off the manifold a hair?
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Tourer
Joined: Mar 2013
Posts: 320
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From: Muskegon, MI
whats your gas like? did you put in new gas? leaving the carb on the intake is like doing the job 95% but if that works for you, your bike. I have a sneaky suspition the pilot jet still has something in it. the pilot jet feets the card up to 25% that it moves to the main by % of throttle given. this would account for the stumble with while slowly twisting the throttle. If you have it idling OK now take some carb cleaner or starting fluid and spray it around the intake rubber if it accelerates you intake rubber needs to be replaced. make sure it is seated correctly before doing this so you dont get a false reading. Hope this helps.
Stellar HDF Member
Joined: Jan 2013
Posts: 3,466
Likes: 425
From: Illinois
It would be easy to mess up the float setting taking the bowl off that way. As said,take it off,clean it up,[soaking in actual carb cleaner] and set the float level as in your shop manual. I have sometimes spent over an hour just getting the float adjusted on these things,it is critical.