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stuttering, bucking, misfiring at steady 2-4k rpm

Old 01-10-2007, 09:54 AM
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stuttering, bucking, misfiring at steady 2-4k rpm

The superhawk is acting up. At steady speed between 2000-4000rpm, like going 30mph, the engine "hiccups" quite a bit. It sounds like a misfire, engine bucks and then smooths out. I think it's running lean, but I'm not sure. I have devil pipes and a K&N jet kit. The jet kit has been in place for 22,000 miles with no problems before.

I'm thinking about re-syncing the carbs and checking for vacuum leaks. Maybe I should also change the plugs. Any other suggestions? Anyone have this problem?

It runs great while accelerating or running on the highway.
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Old 01-10-2007, 01:05 PM
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Originally Posted by zimm View Post
The jet kit has been in place for 22,000 miles with no problems before.

I'm thinking about re-syncing the carbs and checking for vacuum leaks. Maybe I should also change the plugs. Any other suggestions? Anyone have this problem?
Mine was behaving identically and in roughly the same condition (jet kit, pipes, mileage) as yours. Going up a notch on the needles did the trick.
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Old 01-10-2007, 01:13 PM
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Raise the needles a notch, or raise the clip a notch on the needles?
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Old 01-10-2007, 11:50 PM
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Then sync the carbs. Clean your air filter too.

I think he meant go richer, which would be lowering the clip, thus raising the needle.
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Old 01-12-2007, 02:20 PM
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Are the needles titanium?
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Old 01-12-2007, 03:01 PM
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No, stainless steel. I just raised them a notch this afternoon and re-sync'd the carbs too. I'll do a test ride tomorrow and report back.
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