[catmaster65]

My nephew has this same sled in which he needed those same pucks. They are less then $20 US. from AC. He had one broken but didn't replace them until it was to late. The symptoms where alot a like and he made it 250 miles before it took one piston (mag) 30#s compression and the (pto) 100#s which also has one broke also. The valves weren't updated now it's broke and oh shit and lots of $$$$$$. I hope this helps and do a compression test. You didn't say how many miles where on you're motor. What I've seen from research is this motor usually doesn't seem to last much longer then 2000-3000 miles with out new pistons due to high rev's and @ engagement and wide open. You have to remember this is a racing sled which is designed to be freshened up more often then a normal trail sled. this is also a very finicky motor to jetting to make it preform at a peak. I hope this helps and give it a once look over with a comp. test and a visual in the exh port for scoring on the piston wall and cyl. wall. Good luck.