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NorCal426

426 tranny or chain?

4 posts in this topic

Hey, i have an '01 yz426 that runs great, shifts fine (other than the hitting nutruel while shifting between 1st and 2nd, soposedly common with these bikes), and i have been curious about a noise i've been hearing. when i'm not on the gas and am sort of lugging it in whatever gear im in, i hear a slight clanking noise when i suddenly hit the throttle. i was wondering is this just the chain getting some slack off then being slapped back from when i hit the gas? or is this a serious problem i should have looked at? the sound goes away once i start going and drives fine in every gear, its just the part when im sort of lugging it then hit the gas hard. any input is greatly appreciated, thanks

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Its likley the chain. My bike does that too. The noise almost went away when I put a new o-ring chain on it.

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It is probably the chain slapping the guard on the top of the swingarm, if you dont hear it then your chain is too tight. When the chain is too tight, snapping sprockets, bolts etc. is a real possibility.

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does the noise happen when you are sitting still with the motor running? I had to tighten up three nuts that worked them selves loose behind the clutch basket. A mechanic said this was common for these bikes and once I did that the noise went away...

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