well my 2001 xr50 hasent started in a wile it doesnt have any spark, the plug is fine plenty of compression i think it is the computer or sumpthin it gets fuel fine i swiched the wires around tried pretty much everything cept takin it to the shop. can i get a few ideas i have plenty of experiance in small motors and know all the terms so feel fre to explain in detail and technacly thanks