Background information: *I picked up a '92 ski-doo formula plus x and put about 50 miles on it before it melted a piston (mag side). *I had the cylinder bored .010 over and used a new oem piston. *I pulled the carbs and they were fairly dirty so I cleaned them. *Jetting is stock.

I put it all back together and had it running. *Let it warm up good, rode it around the house twice and let it cool down. *Fired it up again and let it warm up good. *Rode it down to the lake and rode about 100 yards on the lake before it siezed. *I never exceeded ~35mph and rode less than a mile.

I pulled the head to reveal a nice vertical gouge right where the pin that aligns the ring rides. *There are a couple other areas where the piston lightly scraped the cylinder. *In its current position, I can slightly turn the crank so that the mag side piston will slide upward slightly but it won't really move. *It looks like the ring end-gap was set properly.

I could be wrong but I can see a gap in the other ring and cannot see the gap in the ring on the new piston. * Should I suggest to the dealer that he is responsible for the damage?

My other question is how do I remove the cylinder and piston from the engine. *The piston is siezed in the cylinder where I can't get to the wristpin. *Should I just pound the piston out with a peice of wood?

I snapped some pictures but they didn't turn out good. *When I pulled the plugs the PTO side (no problems with this side so far) was tan, the MAG side plug was charcoal.

Yes you can use a piece of wood and a mallet to get the piston out, a little oil probably would help it out also. *As far as the dealer responsibility is concerned, I have no idea if they would be responsible, unless they did the work, or gave you the wrong part. *I'm not really sure though. *Good luck.

I forgot to elaborate on the dealer portion. *I had the dealer bore the cylinder .010 and asked him specifically to check the ring-end gap.

It would be helpful if I had the pictures but my digital camera was acting up. *Apparently not all of the pictures I took were saved. *Stay away from the Kodak cameras, nothing but problems. *It takes good pictures, when it decides to turn on.

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (JETRep @ Jan. 27 2002, 8:40pm)</td></tr><tr><td id="QUOTE">I put it all back together and had it running. *[/b][/quote]
Let me get this straight... You put it back together and now want to blame the dealer?http://www.snowmobileworld.com/forums/iB_html/non-cgi/emoticons/confused.gif?

The way the first story sounds like you put it back together. *But when you put the rings in did you get them in the right place top ring lower ring there is a difference. *And did you use the pins in the pistons to keep the rings from turning or did you accidentaly push the pins in not knowing what there for . *The pin is probably pushed in holding the ring out on the end of the gap which worn and gouged the cylinder.

As with others, we don&#39;t know who rebuilt it. *My question, is the piston in the right way? *Arrow pointing forward?

Yes, the arrow was pointing outward. *I did the rebuild but the dealer did the boring. *I no longer believe he is at fault, however. *I think the cause of the seizure was not due to the carb itself unless I somehow missed a clog when cleaning them. *The reason I originally thought the dealer may be at fault was because I couldn&#39;t see the gap in the ring when it was in the cylinder while I could plainly see the gap in the good cylinder. *This time it seized up really good (last time it wasn&#39;t seized, just melted the piston). *I don&#39;t think it was simply jetted too lean on top because this seizure occurred when I was going no faster than 35mph, I was barely on the gas.

So I guess I need to look at fuel lines, filters, etc. *Is it possible that the brief wide-open run could have simply &#39;blown-out&#39; the MAG side seal? *I don&#39;t have a compression or leak-down tester so I could test the cylinder after rebuilding it. *Looks like a compression tester will be my next purchase.