Yeah, as I recall this was discussed a while ago. There is a bushing to be replaced, and also a rev limiter wire on the CDI box that gets cut. I took particular interest in it because I was going to pep up my granddaughter's little 50, but she seems satisfied with it the way it is. It's a green wire loop on the 50, and on the 90 it's also a green wire. This one has 2 green wires in the CDI box. Only cut the one going to the 4 wire connector.
Wish I could remember who supplied this info
, to give him credit, but I'm glad I took notes. I also can't say if it's the same for 2 or 4 stroke.