I had to replace mine with less than 3000mi on it. I put a manual tensioner on it and have had no problems. The manual one is only $50 and if it starts making noise again you only have to tighten it. It appears to be a common prob on 98-99 bikes
What have you been doing to your bikes? I've just clocked over 180,000k's and the only thing that's been replaced in the engine is the rocker cover gasket.
Cam chain still sounds sweet.
My bike is one of the very first batch of ZX-6R's made, in '94. So much for the first year of a model being riddled with problems.
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