Vibration worse after fitting exhaust headers question

RayNeal19

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Jun 13, 2006
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Reading, England
I fitted some Keihan exhaust headers yesterday and during a run today found that the engine revs throught the mid-range better but there is worse vibration from around 3.5k - 4.5k revs than with the standard headers.

Can anyone tell me if this is normal while the fuel injections sorts itself out for the new headers or have I fitted them incorrectly?
 


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