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Message: <blockquote data-quote="David Atkins" data-source="post: 521404" data-attributes="member: 33198">Simple but can be complicated, as the two-stroke’s piston rises on compression, its underside pulls a partial vacuum in the crankcase. An intake port of some kind (cylinder wall port, reed valve or rotary disc valve) opens, allowing air to rush into the crankcase through a carburetor. When a 2 stroke sits the fuel can become contaminated thus all of the fuel system entry points can be clogged or loaded up with junk. Could have been the reed valves, cylinder wall port or disc valves sticking, not sure which one you have but I suspect that was issue since you said it ran fine later!</blockquote>