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lawn mower will not start?

i have checked for fuel good air filter good new spark plug and jumped seat switch ,have good compression
mike, December 2011
Change your spark plug if you haven't all ready. The porcelin down inside around the electrode might be damaged and the spark is firing inside the plug when under compression, yes it happens. I have seen it mostly with NGK Plugs. It sparks normal outside of the cylinder but not when under compression.

Luggnutt, February 2012