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yamaha2004r6

wr 400 rattling

5 posts in this topic

hi i hope some one can help :smirk: i have a 1998 wr400f which is making a clanking noise from the left side of the engine. It is quite loud and erratic and not a constant rattle you can hear it when idling standing still and when you ride it. It starts just fine and pulls really well.

Does any one any ideas many thanks.........:thumbsup:

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Check the valve clearance. Mine started doing the same thing this summer. Turned out the piston was hitting the valve. Cost me a new top end. Wiseco piston---tolerance to close!!!

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Funny how both your YZ and WR have the same issue....

So which bike do you REALLY have - it could be helpful to us in diagnosing.....

Where on the left is the noise? Top, bottom, middle??

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Funny how both your YZ and WR have the same issue....

So which bike do you REALLY have - it could be helpful to us in diagnosing.....

Where on the left is the noise? Top, bottom, middle??

i thought being more or less the same engine i would have better luck posting on both but it is a wr 400

And the noise is fo the left middle to bottom thanks

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Take off the timing chain tensioner first - while you take it off, see if and how much it is pushing itself out as you loosen the screws - if it's not pushing itself out then there's a problem with the tensioner.

If it does push itself out, then the next step I would take is to remove the stator cover and look inside, could be a loose/fallen bolt (rear timing chain guide has a bolt behind flywheel.

Just wondering how many hours are on this machine and when was the last time the timing chain was replaced - could be that it's so stretched it's slapping around in there like crazy. Not a good thing.

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