I have had nothing but problems with my thumper kit, i installed in my 450.
I installed the kit and it rattled right away. Thought I had a bottom problem installed a new crank, bearings, cam. I installed everything brand new and it still rattled. I removed the piston, jug, head and sent it back to the machine shop. Now I have the machinist saying it was the kit, and thumper saying it was the machinist. This is bull, I called thumper and they act like it not there problem. The machinist is trying to help. I have over a 1000 dollars in a machine I can't drive. I will never ever buy another thumper product. When a company won't stand behind the product they ain't worth spit!!!!!!!!!!!!
