Hi all. I've got a '94 900rr with a knock in #3 piston/cylinder. I've got the top end off, and can notice an obvious problem w/ the #3 piston. It doesn't rise as far as the others, and on the downstroke, I can tap the top of the piston w/a deadblow hammer and hear the piston 'seat' down onto either the pin or the crank. Now, I knew this was probably the case when I bought this bike, so no suprises so far. My question is, is this a known problem with the '93-'95 RR's? Seems that every post I've read on the 'net regarding motor woes with this model all revolve around the #3 piston/rod/crankpin (one was a gent selling a set of pistons, one of which had suffered the "dreaded #3" failure). And if this is the case, is there anyone who's been thru the rebuild process themselves. I'm just curious whether to expect to have to machine the crank, or maybe get lucky and just replace the piston/rod/wristpin. As much fun as I'm having tearing the motor down(really, I've never been this deep into a modern 4-stroke, it's interesting), I'm just starting to wonder if I wouldn't be better off simply picking up a used motor (easier said than done) for $700-$1200, or soldier on w/the rebuild of my existing motor. Anybody w/past experience, I'd love to hear from ya'! Thanks everybody.

(/me goes back to watching AMA Superbike on Speed)

 

whats up , yea i have a 94 900 with 30,000 miles mine had the same prob 3 months ago i spun out #3 crank bearing knocked a lil bit but i got it re welded for like 320 with balance at A.P.E based out of cali, i got rods falcon 800 for a set , but its up to u i got like 2,000 into my rebuild with bore out to a 945 and an **** load of other work don't think there is much else to do but turbo and nos ... but for what its worth its up to u ..........

 

Sweet. Thanks for the reply.
Oh yeah, how's yours run now....or is it back in the bike yet?. Interested in how the overbore went.
Will

 

Well i just got all my parts this wed. im puttin her back together now some what but im still waiting for the crank main bearings and rod and then im good to go ....i will let ya know , the guy at the shop said i should be in the 9's somewhere