Piston Damage Checklist - 2 Stroke Engines - Polaris Magnum 2x4 Service Manual

ENGINE
Piston Damage Checkl ist
Piston Damage Checklist - 2 Stroke Engines
(Some items may not apply to all engines)
• Oil tank empty; oil wrong type or contaminated
Oil filter restricted
• Oil pump inoperative (drive gear, cable, pump); oil check valve restricted or faulty
Lean carburetion or oil delivery due to: Vent lines pinched, kinked, or restricted (carburetor, oil tank,
fuel tank etc.); Restricted oil or fuel passages, incorrect jetting for altitude/temperature
• Inoperative fan or low fan RPM (check fan motor amp draw-should be less than 6.5 amps; low bat-
tery, fan switch or connections, wiring)
• Cooling system, cooling fins, radiator fins restricted, air flow obstructed
• Incorrect piston to cylinder clearance
Air leaks in intake tract / air intake ducts / mounting flange (damaged or loose)
• Foreign material ingestion
• Air in oil pump / lines
Air in cooling system / low coolant level
Poor fuel quality
• Restricted exhaust
Incorrect ignition timing
• Spark plug heat range incorrect
• Fan blade incorrectly installed or damaged
Air box, carburetor, or exhaust modified
5/98 3.98
Polaris Industries Inc.