Dude, you pull it over and press your thumb on the spark plug holes and you can feel the compression. No need to start it up to know the compression. But I am with 377safari, I would always want to start up a sled and take it for a ride before I even thought about it.Originally posted by alex2929
[br]hmm how exactly can you tell just by feeling how much preasure pushes against it. Do they leave you start the snowmobiles up at the auction because you could probably tell a lot from that.