Engine problems, please help... getting desperate
Outstanding HDF Member
Joined: Jul 2011
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From: North London, UK
Of course, someone with more technical expertise might be able to discount this...
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Cruiser
Joined: Feb 2012
Posts: 160
Likes: 2
From: North Florida
Would too big of a slow jet cause it to stumble on one cylinder? That's the most puzzling thing to me, the front has great rhythm, steady and clean, the rear runs like crap
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Joined: Feb 2012
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From: Reality TV
I was going to make a bunch of jokes and be a bit of an @$$ but instead I called a great tech who just happens to deal with this allot. He said that yes in fact the front cylinder can be beautiful in every way and the rear can go to hell or the other way around and that what you are describing is probably due to the leak you found. The jets should not be an issue.
Stellar HDF Member
Joined: Oct 2010
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From: east texas
front and rear cylinder's run on the same jets, It aint your carb.
start with the basics, compression test? index spark timing both cylinders. swap plugs (new doesnt mean they are good )
check /swap (if you can) plug leads.
you already have checked for manifold leaks ,do it again.( but if front runs good , it is probably ok , leaks causes vacumn problem on both jugs.
idle that baby to about 900 ,see what u got ..potato --pause----potato.
aint good even tho it sounds neat...
start with the basics, compression test? index spark timing both cylinders. swap plugs (new doesnt mean they are good )
check /swap (if you can) plug leads.
you already have checked for manifold leaks ,do it again.( but if front runs good , it is probably ok , leaks causes vacumn problem on both jugs.
idle that baby to about 900 ,see what u got ..potato --pause----potato.
aint good even tho it sounds neat...
Last edited by heybaylor; Feb 27, 2012 at 08:18 AM. Reason: add info
Outstanding HDF Member
Joined: Mar 2010
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From: Hudson Valley, NY
Did you hook up the VOES correctly? Or test it? I missed that when rebuilding my carb and the bike idled and ran like ****.
Other than that maybe an exhaust leak on the poor running cylinder, I would also toss in known good plugs and give it a shot.
I wouldn't think it's the jets, one carb feeds both cylinders so if one is running perfect and the other isn't the carb is probably fine.
Other than that maybe an exhaust leak on the poor running cylinder, I would also toss in known good plugs and give it a shot.
I wouldn't think it's the jets, one carb feeds both cylinders so if one is running perfect and the other isn't the carb is probably fine.
Last edited by babalu; Feb 27, 2012 at 08:53 AM.
Seasoned HDF Member
Joined: Apr 2006
Posts: 10,675
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From: Billings,Mt.
Could be the carb is leaking inside somewhere and or intake leak?
All of you guys bring up good and valid points but the thing that has me is that there is no change when he adjusts the slow idle jet from almost all the way in to all the way out no change.
Dude, Try the smaller jet and see if it changes at all???????
It's Worth a shot. You have the smaller jet so it's just a little time to change to see if it affects it at all.
Dude, Try the smaller jet and see if it changes at all???????
It's Worth a shot. You have the smaller jet so it's just a little time to change to see if it affects it at all.
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Outstanding HDF Member
Joined: Mar 2010
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From: Hudson Valley, NY
I'm no expert at all though so take my advice with a grain of salt.