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Repair guides and support for motorcycles manufactured by Harley-Davidson.

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06 Fat Boy 88cu in misfiring

I've owned the bike for many years and it has always had what I feel is a misfire but now it is very frequent. I have changed plugs and wires. Compression check wide open throttle had front cylinder about 100psi and back 125psi. Changed intake/exhaust valves on front cylinder and now both have 125psi but problem still exists. If you put your hand in front of the air intake when it happens, a puff of air comes out against your hand. Has anyone else had this problem or an idea as to what is causing it?

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I am not a mechanic and I never owned a HD, but logically, if air is coming out of the air cleaner when it misfires, there must be a valve timing problem.

That may have been the cause of your valve problem. From your description, it sounds like it is only the front cylinder. If it has solid lifters, the clearance must be set properly. If it is hydraulic lifters you may have a defective one on the intake valve. It could be that there is a mfg defect with the cam since it has been there from the get go, but that might be a stretch. If a timing chain were off it would affect both cylinders.

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Kevin Luckenbill 영원히 감사할 것입니다.
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