My ATV needs a bigger engine. What would be a suitable engine that will fit in the frame and bolt right up to all the original equipment? Please help.

 

Next step up would be a 425 or 500 engine,BUT there would be changes needed on motor mount locations,plus you would need the electrical harness,modules,etc in most cases. You can install almost anything in any atv,but nothing will bolt right up other than another 330 engine.Best to sell it if it's not enough machine for you and get what you want or expect to do a few modifications if you change engines.