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Chainsaw
Stihl MS-250 experienced a runaway lean condition and locked up
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<blockquote data-quote="B440" data-source="post: 6127448" data-attributes="member: 61228"><p>Air in the crankcase will always be a mix of fuel and air since it goes through the carb first, so the tiny hole in piston theory has little merit. You need incoming air from a source other than a slightly-rich tuned carb to get lean.</p><p></p><p></p><p>My money is on air leaking in through the crankshaft bearing on the clutch side. It's the most logical source from what you described. Let us know what you find out.</p></blockquote><p></p>
[QUOTE="B440, post: 6127448, member: 61228"] Air in the crankcase will always be a mix of fuel and air since it goes through the carb first, so the tiny hole in piston theory has little merit. You need incoming air from a source other than a slightly-rich tuned carb to get lean. My money is on air leaking in through the crankshaft bearing on the clutch side. It's the most logical source from what you described. Let us know what you find out. [/QUOTE]
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