04 up cdi runs off the battery. 03' cdi runs of stator coils.
you can use 03 stator with 04 up cdi by not using the wires that power the cdi but cannot use an 03 cdi with 04 up stator.
other than the water outlets and the large fitting on some stators,it should interchange i thought.
you mean the 4 long bolts have different diameter? sure it's not a 148/155mm?
if you want to keep a 550 engine in it,yes they work well but you will need to port the cylinder and cut pistons following their instructions.
if you want to go fast,a 650/701/750 mod is better.
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