Chainsaw Repair

It might sound good but with reservations .I know of one conversion where they used an Opal 4 cylinder to replace the Ford tractor engine which was around 70 HP .Keep in mind the Ford 4 banger was around 24-25 HP .It had a tendency to break axles .With a Ford flathead V8 were talking about 90-100 HP .They wouldn't pull any more they just could do it faster .
It's kind of like a small block Chevy or a Ford 302 in a CJ5 Jeep .It won't go any faster and it would break axles also .They would climb the hills in a higher gear but they drank about 3 times the gasoline of the original 65 HP  4 banger .