Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
How long does the engine take to overheat? Did you get the camshaft and crankshaft gears in correct time when you installed the camshaft? Was camshaft replaced?
Is this water cooled version or air cooled?