1997 Ski-doo Formula III

jhecht · Post by **jhecht** » Thu Nov 29, 2007 3:12 am

I have a sled in my shop right now that was running fine but put it on the stand to run it a little bit outside (it was about 25 degrees out and there was a dusting of white stuff on the ground) Like I said it was running fine then it started to run like it wasnt running on all 3 cylinders... I pulled the plugs and found the plug closet to the pull start (furthest from the PTO Clutch side) to show the cylinder was running very hot, and lean. I ran a compression test on the cylinders and and got about 125lbs. across the cylinders, except the one that was running hot was about 120. I put a little oil in the cylinder and ran the test again and the pressure increased to about 130-135 in all cylinders. Which is why I am thinking its the piston rings but I just want to make sure before I tear the engine apart and have to buy all the gasket kits and rings. Is there another way to find out or maybe another Idea. I just cleaned all the carbs and put brand new plugs in. Any thoughts??

_FIII · Post by **_FIII** » Sat Dec 08, 2007 9:50 pm

can't really help you out here but you should try the guys at www.dootalk.com They have all the knowledge for ski doo stuff. Go to the mach Z forums and at the top of the page is a sub forum for ski doo triples. Lots of smart guys there. That is where I get all my questions answered about my 1998 Formula III 700. Good luck with the sled.