I am rebuilding an 800 Rfi engine, it needs a top end. I just happen to have a set of WSM platinum carb pistons. There is a different part number for the fuel injected pistons. Pro-x and SBT say that their pistons will work in either engine. Why does WSM have two different pistons? Are they the same piston with just different part numbers? Because they look pretty much identical. Any help would be appreciated. Thanks!


