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Hey Anon,
...If the bike has been sitting for a long time,.. as you state..99.999% chance its the carburetors, they are probably clogged/stopped up/dirty.. (sitting for this long has actually ruined some carbs to the point of replacement).. all the garbage that is included in gasoline now is really bad on the insides of a carb!!) Take them to a qualified professional for checking, cleaning and setting .... Check the compression on all cylinders.. you should have at least 120+psi. MINIMUM.... with no more that 20PSI. max difference between ANY two cylinders... Forget about all the minutia in the first answer.. just a bunch of copy and paste... no real life experience..he's just racking up points
Pull those spark plugs back out and check the gap, Charles. If they don't have the correct gap, they'll work poorly. If the gap is a LONG way from correct, they won't fire at all.
indicates a fuel problem
wide open throttle and back firing indicates low float level or fuel flow problems
check for tank vent is working as it could be a vacuum forming in the tank preventing full fuel flow
replace the fuel clean the carbs change the oil new plugs clean air filter check the valve clearances( if any are really wide a valve may be stuck open) I assume you have already fitted a new battery
Things need to be asked, have you had the valve clearance checked. it could be holding the valves open when the motor is warmed up and not getting the compresstion it needs.
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