09-22-2005, 10:57 AM
FreeRideJunkie Wrote:....Also, I had a brain fart. I've been running 20% but will be switching to 30% so I should richen a little bit correct?? I think that's right because the fuel will burn a bit faster so you need more.... ahhh whatever.
Do you have to shim the head when you go to 30% and higher? Or is that just with SOME engines?