Bike stumbling, missing, backfiring until warmed up... HELP
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Tourer
Joined: Aug 2013
Posts: 275
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From: co
Bike stumbling, missing, backfiring until warmed up... HELP
Started doing this just recently for the 1st couple minutes on the road every time I stop, shut it down for more than an hour and start again. Runs great after it gets going with no issues.
I do let it idle a while before I go too and it doesn't help. I checked for intake leaks and it's very tight, no leaks. I am stumped.
Anybody know what could be the cause and help me to fix please?
I do let it idle a while before I go too and it doesn't help. I checked for intake leaks and it's very tight, no leaks. I am stumped.
Anybody know what could be the cause and help me to fix please?
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
I can't tell you how to fix your problem but when I first got my bike she was doing the same thing.
I had the carb rebuilt by a local indy (they fixed many problems) and it got better but was still doing it (just not as much).
I got an S&S Super E with intake and haven't had a problem since.
I had the carb rebuilt by a local indy (they fixed many problems) and it got better but was still doing it (just not as much).
I got an S&S Super E with intake and haven't had a problem since.
Seasoned HDF Member
Joined: May 2008
Posts: 21,174
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From: South Carolina
Does it still have the original butterfly carb with the rubber compliance fittings between the heads and the manifold?
How did you check for intake leaks?
Try something easy, drop the fuel bowl and give the carb a shot of carb cleaner. Maybe there is some debris in there.
How did you check for intake leaks?
Try something easy, drop the fuel bowl and give the carb a shot of carb cleaner. Maybe there is some debris in there.
Last edited by Dan89FLSTC; Mar 31, 2014 at 05:58 PM.
Road Warrior
Joined: Dec 2007
Posts: 1,666
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From: Styxville
Mine did that when I first bought it. Would've sworn it was carb/intake problem.
But the starter was cranking slow so I put a new battery in it and hey presto the coughing and spluttering went away.
I had to put a new regulator on it a few months later, so that may have been the root cause of it all.
But the starter was cranking slow so I put a new battery in it and hey presto the coughing and spluttering went away.
I had to put a new regulator on it a few months later, so that may have been the root cause of it all.
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Tourer
Joined: Aug 2013
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From: co
Well I have been warming it up more than usual with the enricher on since the rebuild thinking that I don't want to blow out a base gasket as recommended.
I am thinking that idling that long with the enricher wide open may have been fouling the plugs. When riding to and from work today I kept the enricher on only for like 1 minute (instead of over 5 minutes) then revved the motor up to about 4,000 rpm a few times before taking off.
It didn't backfire, stumble, or surge this time. Related? Could I have been fouling plugs with the enricher on for so long? It wasn't giving any indication while idling that it was missing or backfiring, but I did smell a rich burning exhaust fume for sure.
How long should I leave the enricher on? New to the CV carb, since it is a recent upgrade.
Thanks
I am thinking that idling that long with the enricher wide open may have been fouling the plugs. When riding to and from work today I kept the enricher on only for like 1 minute (instead of over 5 minutes) then revved the motor up to about 4,000 rpm a few times before taking off.
It didn't backfire, stumble, or surge this time. Related? Could I have been fouling plugs with the enricher on for so long? It wasn't giving any indication while idling that it was missing or backfiring, but I did smell a rich burning exhaust fume for sure.
How long should I leave the enricher on? New to the CV carb, since it is a recent upgrade.
Thanks
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Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
I use the choke to start the bike then like a minute later (if that long) I close the choke and use the throttle lock to set the bike to about 1500 rpms to finish warming up.
It sounds like you were fouling your plugs. 5 or more minutes is way to long in my opinion.
It sounds like you were fouling your plugs. 5 or more minutes is way to long in my opinion.
