thats just bull. some people are ripping you off when they sell the snowmobile they go like "motor is recent rebuilt or new motor from powersport place or by him/herself". Not without proof of recipes or paperwork that is rebuilt or new parts in it.
I made a bad descison when I bought the vertical escape (over 3000 miles on chassis), was told that motor is rebuilt (brand new pistons, jugs, and crank), by polaris powersport store (about 200 miles on rebuilt from what I was told). I asked him for proof of recipe and he didnt have it but the motor looks like it was like new in picture. Bought it. rode about 200 miles later, the motor locked up. Then took the motor to powersport place and took it apart. He told me the crank is junk, welded on wrong spot where its not suppose to be on. I contacted to that guy who sold me the snowmobile, have not respond me back. More $$$ flushed in the toilet.
Lesson learned. I wont fall for that again... ever.
For newer sleds that just had motor rebuilt or new, must have recipes or paperwork.
just saying.
I keep the recipes of my motor that recent rebuilt with new indy dan bottom end and new pistons and clutch.