Why is my zxr400 vibrating at 5000 rpm

Kawasaki ZXR 400 discussion forum:


Why is my zxr400 vibrating at 5000 rpm

Why is my zxr400 vibrating at 5000 rpm 
Debs said 2004-07-30 15:44 
 
At 5000 rpm my bike really vibrates and sounds awful but once the revs get over 6000 the noise fades out.
since putting a race exhaust system on my bike the sound has got louder as the vibration comes through the exhaust, it doesnt feel juddery it just sounds rough.
Ive checked the air filter and that is fine.
The bike only vibrates when its being ridden. 
 
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