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04 gsxr 1000 motor in 02 bike won't fire

1.7K views 5 replies 5 participants last post by  03gixxer1k  
#1 ·
Have a friend that just put a 04 1000 motor in his 02 gsxr 1000 and it will back fire about every 10 times it turns over. is the ecu different 04 vs 02 that it's not firing right? if not any ideas?
 
#5 ·
It should work just fine with only changing the cam chain sprocket/ignition rotor. You would need to machine the tooth out of the inside of the triger that lines up with the punch mark. the triger will not even go on the crank without doing this. 03 and newer cranks have one tooth filed in and the triger has a tooth missing so it can only go on the right way. 01-02 1000 is all teeth and line up the punch marks.