Sleeves Gaskets Oil Seals Main Bearing Valves Exhaust Parts Water Pump Fan Belts Motormounts
Only Pro-X Snowmobile Pistons include a top end bearing as well as piston pin, rings and circlips
THE FOLLOWING IS A GUIDE ONLY WHY… Did the piston fail?
Suspension & Traction
Check for air leaks, lean fuel mixture, ignition timing or any combination of these most frequent causes. Make sure there is no foreign matter or broken pieces in the crankcase. NEVER… Never use chrome rings in chrome cylinder liners. These cylinders cannot be rebored, they must be resleeved. Our Wiseco and LA Sleeve Sections are a good guide. ALWAYS… Check cylinders for wear. Have cylinders deglazed or rebored by a competent shop. Clean case surfaces, etc. before reassembly. Use good quality new gaskets (remember air leaks) and check each piston ring gap. Approximately .004” gap per 1” of cylinder bore. Always refer to the manufacturers recommendations. Arrows should point to exhaust side of engine (Polaris points to Magneto side) . Check to make sure ring locating pins do not fall into ports.
Brakes & Cables
Be sure there are no rough, worn or sharp port openings.
Never use force to insert or remove a wrist pin, always use new circlips. On rebuilt engines avoid harsh acceleration or sustained high speeds. There is no piston or parts warranty on modified or ported cylinders. Reference to O.E.M. names or part numbers is for identification purposes only.