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Discussion Starter · #1 ·
83' Shovelhead

I have it about a year and been running well. This season it began to hesitate for short spurts and then back to good running. Seems to be getting worse. I put in new plugs and wires with no change, also checked for manifold leaks and all seems good. Any advice?

Thanks
 

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Discussion Starter · #3 ·
Hi,

I have a single fire ignition.

This didn't happen at all last year.......happened very little beginning of this season ,now its hesitating for most of the ride, seems like the first 5mins or so is fine then it starts.....last ride got stuck in that hesitation mode and then it like "popped" out of it and ran great fro a few minutes ( smooth) , then back to hesitating......I cant "throttle" out of it either......when its hesitating the low end of each gear is a real struggle, I have to run a lower gear at high rpms just to keep moving
 

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That sounds exactly like an intake leak. Maybe go back and recheck for leaks. How did you do it the first time? Pay close attention to the back of the carburetor where it mounts to the manifold.

Another possibility is the low speed / off idle circuit in the carburetor. Is it an S&S carburetor?

The third thing that comes to mind is an ignition issue of some kind. Like the advance isn't working right. Is it an older Dyna single fire unit or is it an all electronic unit?
 

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Discussion Starter · #5 ·
I have an S&S E carb and not sure about the ignition I just know the basics lol, to check for leaks I sprayed WD-40 where the exhaust meets the heads.....what should I try?
 

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Try using the WD-40 again but also spraying it around the joint where the carburetor attaches to the manifold. Do the whole test after the bike has warmed up. In other words if it runs right when you first start it, and you do the test at that same time, it likely won't show the leak. It'll be easier to find if it's running rough. Hot temperatures can change the seals and cause a leak.

If it's a small leak that opens and closes you'll hear just a slight little change in the engine when the WD-40 hits it, and it won't last long. Listen for just any slight change.
 

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I had that issue last year - the intake would only leak when I ran higher speeds for a while and heated things up.
 
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