Possible bent valve?
Thread Starter
|
Novice
Joined: Dec 2009
Posts: 19
Likes: 0
Possible bent valve?
OK guys....hope someone can help. I have an S&S carb on a 111 S&S motor with a spike air cleaner and V&H ground ponder pipes. When the pipes and carb were installed the bike ran great for 2 years. In September I took the bike out, and about 15 miles out it started to back fire sputter, stall, make all types of popping noises. After re-starting several times, feathering the clutch...I got the bike home. Next day drained fuel
refilled with new fuel, replaced plugs, took the bike out for 2 miles and it ran fine.
Today took bike out 2 or 3 miles and the same problem started again. Brought it to a bike mechanic and he tried changing the jets to bigger, then smaller and back to original, tried adjusting accelerator screw, adjusted idle screw, new plugs, checked fuel filter and the problem still exists. He mentioned it might be either the coil, or ignition. He calls me today and says he wants to do a compression check, it may be a bent vave does this make sense? Does anyone have any other suggestions that may be the answer? Please help!
refilled with new fuel, replaced plugs, took the bike out for 2 miles and it ran fine. Today took bike out 2 or 3 miles and the same problem started again. Brought it to a bike mechanic and he tried changing the jets to bigger, then smaller and back to original, tried adjusting accelerator screw, adjusted idle screw, new plugs, checked fuel filter and the problem still exists. He mentioned it might be either the coil, or ignition. He calls me today and says he wants to do a compression check, it may be a bent vave does this make sense? Does anyone have any other suggestions that may be the answer? Please help!
Banned
Joined: Aug 2009
Posts: 771
Likes: 2
From: Hurricane,WV
If it does not do it all the time, you can rule a bent valve out my friend. If a valve is bent ,it will stay bent no matter what. It does sound to me like your ignition may be about to go out on you. It is not uncommon for them to act up one minute and run fine the next. Not saying anything about your mechanic, but it may just be that the ignition is not messing up right now. I would be willing to bet you that it is either the coil or ignition. A coil going bad will be fine when the motor is cold. But, once it heats up it starts running bad and stays that way until the engine cools off again. Alot of times your ignition will cause the bike to only run on one cylinder when it is acting up. It will also backfire spit, and sputter. That's what it sounds like to me. Hope that helps.
Thread Starter
|
Novice
Joined: Dec 2009
Posts: 19
Likes: 0
UPDATE....
Mechanic was fired. After I told him to put the bike back together I cant afford to do anymore trial and error.....he leaned towards replacing the coil/ignition. LOL what an assh***. I then asked him about the compression test and he said the hard thing was going to be for him to find someone who has the tester for him to borrrow. WTF? I brought the bike home and will keep you all posted! Thank you for all of your help IT IS APPRECIATED!!!!! Any other thoughts and suggestions are still welcomed.
Mechanic was fired. After I told him to put the bike back together I cant afford to do anymore trial and error.....he leaned towards replacing the coil/ignition. LOL what an assh***. I then asked him about the compression test and he said the hard thing was going to be for him to find someone who has the tester for him to borrrow. WTF? I brought the bike home and will keep you all posted! Thank you for all of your help IT IS APPRECIATED!!!!! Any other thoughts and suggestions are still welcomed.
Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
we did warranty work on AIH bikes,replace the ignition.we had alot of probs with stock ignitions,we replaced them with dyna S`s
kirby
facebokk: kirby apathy
kirby
facebokk: kirby apathy
Trending Topics
Thread Starter
|
Novice
Joined: Dec 2009
Posts: 19
Likes: 0
Update......
fired last mechanic. took bike to another shop. hasnt had much time to look at my bike. said he had it on dyna machine...bike ran fine than started to act up. said he wants to try a few more things. mentioned a bad electronic compression release. any thoughts?
fired last mechanic. took bike to another shop. hasnt had much time to look at my bike. said he had it on dyna machine...bike ran fine than started to act up. said he wants to try a few more things. mentioned a bad electronic compression release. any thoughts?
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
