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  1. 7

    1977 xs400 backfiring

    I only use 95octane no ethanol fuel in all my smaller engines just for that reason,
  2. 7

    1977 xs400 backfiring

    Thanks for the reply, It is backfiring through the exhaust just idling only on the left side It does pop a little on the intake when you raise the throttle mainly when its warmed up, the plugs are brand new ngk plugs when I pull them out they aren't really wet they have some black carbon on them...
  3. 7

    1977 xs400 backfiring

    I have a 77 400 backfiring on the left cylinder replaced plug, set timing,adjusted valves, coil is reading 20kohms on the secondary 4ohms on the primary, checked compression, rebuilt carb put in jets replaced carb boots checked for air leaks. does anyone have any ideas?
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