Posted by Glen D Anderson on January 18, 2009 at 18:54:46 from (75.158.71.82):
In Reply to: 440 snowmobile posted by jim malla on January 18, 2009 at 14:28:49:
Detonation, but why?
Where are the holes located?
If they are close to or right on the edge of the exhaust port side of the piston, a lean condition stemming from improper carburetor operation or vacumm leakage likely caused the problem.........
If the holes are closer to center of the piston, causes may lean towards too low of octane fuel, overheating(inadequate coolant circulation or air flow if engine is fan cooled), incorrect timing, etc............
Before the engine is operated again after the pistons are replaced the carburetor/s should be completely disassembled and properly cleaned. Proper jetting(or high speed adjustment) for your altitude should be confirmed at that time.
Proper cooling system operation should be confirmed. Proper heat range of spark plugs used. Confirm there is no leakage from engine crank seals, base gaskets, carburetor boots etc., that could causing a lean mixture...........
Lastly, use quality fuel. Premium at least............
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