ski doo formula mach I xtc - Snowmobile Forum: Your #1 Snowmobile Forum

locuno1 · 01-22-2008, 05:33 PM

i have a ski doo formula mach I xtc and it says it was manufactured in 1991 but i was wondering if it was a 1991 or 1992? also it does not run because the pull rope tension is too tight to pull start it and i was wondering if the bearings in the crankcase maybe bad or if it has a seized piston?

Also back in 2004 when it was last rode i was riding down the trail and the engine shut down completely maybe this will be enough to get opinion on whats wrong.

ok i did someone research and i now know that is a 1992 ski doo formula mach i xtc si that answers the first part of my question

maineack bob · 01-22-2008, 06:09 PM

it could be that you have bent your crank my buddy bent his the other day sled shut off and then it was really hard to pull over... but if your crank is bent you might want to find out what caused it

another thing you could have burnt up a piston or even scored one of your cylinders, it could be berrings try this to see if its your top end or bottom thats the problem take off the belt and slowly try and turn the crank forward and backwards if the crand can turn a little bit forward and back the crank is probobly not your problem but the more play there is forward and back the more id lean towards connecting rod berrings or rings, if your crank dosnt have this little bit of forward and back play then its probobly your crank berrings or a bent crank... the only real way to tell your problem is to take the motor apart and see.

locuno1 · 01-22-2008, 07:45 PM

Update the pistons move and the rods still move up and down so it's not seized. also i will have to try that maineack bob. the engine is in the process of being removed i just got the last motor mount bolt off so i will have it on my work bench tomorrow and i will start taking it apart from their.

maineack bob · 01-22-2008, 07:50 PM

no problem glad i could help... also to save yah some money on the head gasked just unbolt the cylinder jugs and not the cylinder head it should slide right off

"good luck"

**smallengineguy** · 01-22-2008, 08:01 PM

Those were cool sleds! Where are you located?

locuno1 · 01-22-2008, 08:07 PM

ok the crank moves with the belt on but i'm still going to look into the connecting rods and bearings when i take the engine apart. also i live in michigan smallengineguy i bought it at a repo auction i believe in the winter of 03 or 04 because the trail sticker on it is a 04 sticker. yeah it was a fast sled until it died. right now i have a 1996 polaris indy 700 triple ouput and a 1991 artic cat el tigre 532