Just wondering if anyone else rides old ones? I just want to do some minor mods to 500cc Yamaha engine. Port and polish heads and maybe add exhaust but I can't find any parts for this old of a model. I like the old ones because they are simple and I don't want my kids riding much faster than these go anyway, but I do want just a little more punch and I like to work on engines.

Scott

scott,
having the stock head milled and adding a stainless prop will do wonders for the older wr.