So far its been an awsome engine new cam flywheel valves and push rods springs and connecting rod left balancing wheight in turning it about 7 grand. Ive only ran it about 6 hours but it runs consistantly. Only thing that i am having problems with is the stock carb. My fuel pump will over ride the float and dump fuel. Havent had a drop of oil in my puke tank. I would recomend this engine to anyone who wants to run a horizontal engine I bought all of the components from affordable go karts