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Mower over heating,and will not start ?

Mower over heating, smoke coming from the back of the exhaust.When I stop the mower I have to wait until the engine is cool otherwise will not restart, i have checked for blockages, everything seems clear,any ideas?
phil, August 2013
if you have checked cooling fins and blower housing would sumise the machine is running very lean to over heat simple check take plug out see what colour it is should be grey ish loads photos online to compare

daz, August 2013
Would try cylinder head gasket may be blown. Make sure air cooling fins are clear.

Michael, August 2013