i got a zx636 04 without 3rd gear.... i find a 05 engine in price of trasmision cost so i decide to buy it and test it on 04 frame....Fit on frame but wont start....i thing its startor coil because my 04 no charge battery so i decide to put 05 startor coils and i cut .wirring of startor coil both of them to can add it to regulator its not same...you know if u cut wirring of startor coil before regulator u damage it?its not like normal wire inside before regulator...now im not sure buy new startor coil?or its my Crankshaft Sensor?i cant change the gear of cranshaft sensor its not the same..... i got spark and no f1 light on service manual say ignition problems =no spark and f1..did any1 know if this cranshaft sensor work without change the gear?i see guy there swap head of 05 to 04 but this no need cranshaft sensor