Join Date: Feb 2011
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I have the same problem did everything work out after you rebuilt it. Heres what happening with mine.
I just bought my first snowmobile used just like yours. I am having a problem with the engine. When I first got the thing it was running great really fast. Then all of a sudden it was running poorly. Then I shut it off let it sit for awhile 30mins. Then it ran good again for like 30 seconds then back to the same problem. I determined that only one cylinder was firing. Thought maybe spark plug were no good. Bought new ones, same problem. Then I bought new boots and ignition coil,the old one were corroded. Still same problem. Removed the new spark plugs both were wet, but one was black. Checked spark its good. Checked compression on both cylinders the one that's running is at 100 psi. and the one that not working its at 90 psi. It has also has had a new electric fuel pump put in from the previous owner. I don't know if that's enough compression in that cylinder? What else should I check before I take the engine apart? If anyone can help me out that would be great.