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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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