How do you know it's not running on all 4? Water test on the exhaust headers? Infrared gauge showing uneven temps on them? Sounds like a subaru with a full exhaust?
if self diag is showing code 40... then just look in the manual and reset according to the manual. i had that happen to me this summer, took the bike apart and checked injectors nad some more shit... read the manual it will save u alot of hassle
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