I have a 1986 Yamaha Blaster the problem is that it was popping under load so it was rebuilt.I turned the pilot screw as the book states 1 and half turns out. The problem is now that it is hard to start when it does get going the engine starts to race up very fast where I have to kill it. With a little adjustment on the pilt screw the engine ran ok but stalls and I have to wait a little before starting it up What should I try next?

 

there is no such thing as a 1986 blaster...and you should try rejetting