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[QUOTE="Micahdawg, post: 885385, member: 21668"]
Thanks for the tips guys.  You know, amazingly enough, I never did measure the cylinder bore.  The guy I bought it from said he sent the jug to be stripped and replated so I assumed it was the standard bore.  I has to be if a standard 67.4mm piston fits this good and has had no other problems.

What if this were NOT piston slap....what else could make a low end knocking noise.

Also, just revving the motor does not produce any noticable noise.  It gets noticable sometimes under load.  Imagine taking off from a standstil on a 30 degree grade going up hill.  Slip the clutch out slowly and gas it a little.  You'll hear a very slight knocking on the low end that goes away as you increase throttle.  I don't think it is the motor noise drowing it out because....moving the throttle from a "little" to a "little more" doesn't make much more engine noise.  It's already hard to hear anyway....I was trying to point it out to a friend and it took him a little while to hear it himself.  It is definitely an issue under load though.

Wouldn't piston slap be occuring at idle and slight throttle as the bike is on the stand?

Micah
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