I have an 04 yfz 450, and i recently seized the crank. So i tore apart the motor to replace it. Everything looked great inside. While i had the motor apart i decided to replace the piston with a wiseco 13:1 high compression piston. I got everything back together and went to start it and it seems there is not enough power to get it going. I put in a brand new fully charged battery and still, no. We pushed started it and it runs awesome, but I don't want to have to push start it on the track. Any suggestions?