I was ridding out on a local lake this past weekend, and my blaster was running great. Then, it stopped working. The motor quickly reved down, and i grabbed the clutch. I changed the plug, and tried everything. Then, i took off the head, and found huge scratches. What is the cause? Was i running too lean? How do i stop this?

 

you got something in your motor.

 

Did the injector stop injecting oil?

 

time for a new top-end. If you haven't blocked off the injector, block it off and check for any metal chips in the crankcase and cylinder.