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how do i fix my honda cb 400 suprer four?

my bike wont start ,it,s getting fuel it has spark,good battrey .it juest keeps turning over and it wont fire,when it last ran it was running sweet

alan mc gearty
December 2004
suck squeeze bang blow when u test the spark plug try testing the compression at the same time what is the spark like ? lightning blue ? or a dull spark ? what is coming out of the exhaust while it is turning over ? smoke rings blue ? more info needed to diagnose exactly as it it could be anything from a worn valve seat / blown head gasket / timing anything

Mr P Allen 22years in the trade :)
December 2004
well if you have fuel and a spark, the timing could be way way out, or the fuel mix way way too lean/rich, or you dont have any compression

matt
December 2004
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