I am new to the forum and just purchased a used 2015 Coolster ATV-3125r. It is 125 cc with automatic and reverse.
As I said I bought a used above referenced ATV, took it to a shop and had it tuned up. The mechanic says the engine is shot and will not last long. My question is, can I replace the current 125cc engine with a larger 150cc engine into the current 125cc chassis? If so, is there a video or some instructional that will lead me through the change over? I am a mechanical retard. Would appreciate any help you can give...

 

What did you end up doing with this?