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Wondering what causes a piston to fail like this. Left plug is from blown cyl, right is from good cyl. All other components look fine, no scoring on piston sides or cylinder walls.
 

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I believe it is a detonation failure. I am sure others will chime in. A friend of mine had a similar failure on a Lynx 340 when he skipped the advice to drain the 2 year old fuel out of the tank and decide to take it for a drive without fresh fuel.
 

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Wondering what causes a piston to fail like this. Left plug is from blown cyl, right is from good cyl. All other components look fine, no scoring on piston sides or cylinder walls.
Jake, a lean condition is what caused your engine to do that. On the side that burnt, check for a cracked carb intake boot, dirty carburetor etc. When one cylinder leans out. This is what happens. If it’s a fan cooled sled, look for a slipping/worn fan belt. 90% of the time the hot cylinder(cylinder furthest from the fan) will burn up if this isn’t caught right away.


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