My bike is a 2003 WR450F. Bought it new back then and never had any of the e-starting problems these bikes had. About 3 years ago i changed the exhaust cam for a YZF one and the starter would spin but the bike couldn't fire up...so i took the battery off and kickstarted the bike since then. now that i installed a BB ice cube kit with web cams the compression increased and the kickaster stiffened a lot. So i did put a battery again to see if with the web cams the problem would be solved. Unfortunately with the stock 5Am battery just spinned the crank and then stopped. i thought that because of the compression maybe the stock battery didn't have the power to turn the motor. So i tried with a car battery, trying to find out what was the problem, but the same thing happened again. The crank just spinned and then stuck again. After a few tries it wouldn't spin at all! I removed the starting motor and found that the wires going to the one brush were cut! But the biggest problem was later to be found...the whole starting motor is "burned" (sorry but i can't find the right words to describe it). So i have to buy a new very expensive starting motor or try to fit a YZF 1000 R1 street bike starting motor, which is very similar to the stock WRF's, as a friend told me. Because i have no clue about these electric stuff, did anyone have similar problems with the starting motor? What could have caused such a problem? the 3 years i didn't use the e-start had to to do something with that?