my '97 has 11,000 miles on it still runs great and has decent compresion
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2002 Polaris Edge X 800 Twin-6,700 mi
1997 Polaris XCR 600 Triple-11,100 mi
1987 Yamaha Inviter 300 Single 1,900 mi(Brothers)
all stock
top end on most sleds is like 5k.. but thats a really relaible sled and is pretty much bullet proof, ive never had one so id go with ultrafrozens advice, but the whole motor will go alot more then 7-9k, thats just topend