I don't know a lot about the ski-doo's, But... I always get told that they are known for "bottom end" issues.
My dad rides a '97 mxz 583, has to have nearly 3k on it by now (speedo don't work, and he won't buy the part to fix it) But has had few problems so far.
Good friend bought a '98 670? (same as my dad's, just bigger engine) and it wiped the crank out at approx. 400 miles. I don't know if they ever determined the cause or not.. If so, I never heard what it was.
Like everyone has said, make sure that you do the homework and try to find out why the seals are blown. I suppose it could just be they dry rotted, but never fixed that on a newer sled.. (but changed a lot of em due to rot on old John Deere sleds.)
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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