Help me with enigine knocking noises while lugging engine

hmm i can't see how jetting could affect this but maybe you were lean and knocking/pinging

my 2004 WR450 used to do this until I installed the JD jetting and the zip/ty fuel screw. All noises gone now and huals butt!

you sound like a sales man :ride:

So is the chain slap caused from preignition, or just the tractor pop from the motor. Mine just started slapping aliitle more, and I contribute it to the chain stretch as I see it sagging some more. It dont take long to stretch this chain when your hitting the back wheel with 50+HP.

yeah, mine got worse as the chain stretched, then i checked the specs, i'ts all good, so no adjustment needed yet.

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