Strange noise...

Been out with the lads (and my wife, pretty cool, she only fell off twice, which considering she'd never ridden a bike at all before Oct07 is pretty good) done some gentle green laning (and some not so gentle) all fine until the ride home and the bikes knocking when I accelerate hard at low revs. It sounds like chain/sprocket sort of area that the noise is coming from, but it's not the normal noise it makes if the chains loose - heavier, sort of rhythmic knock. Any idea's?

Sure your not just lugging the motor?

Depending on your chain tension, it can get into a nice resonance at lugging speeds. I noticed it when I first got my DRZ with the chain properly tensioned. After much advice from riders here I started keeping the bike revved a bit higher...which it prefers.

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