I just had a crank bearing replaced and paid a shop to do that but took care of the top end myself. I replaced the piston with a wiscoe. I also reshimed the valve's and made sure my timing is good. I do know that my coil has high resistance according to the manual I have its supposed to be at 9500-14300ohms and mine is at 22000 ohms. I still get a spark though. I tried ordering one off eBay but it seems no one knows how to perform a simple resistance reading. So I have tried to kick her over trying to find the sweet spot but the only response I get is a backfire every few kicks. One time smoke came out the air filter. Is that normal? I would like to know if the back fire is normal and what else I might do to start the bike for the first time after the rebuild.