i had one. It was a great mill but not for tight tracks. I used venturi's and still it drank mroe fuel than my friends O.S. and parts were harder to get. So i sold it and got myself a O.S. 12 CV-R. Its easy to tune and i dont care as much about it as my 225 dollar racing mill.I could never use the power it had on the track though especially since we race in a tight marbly indoor surface.[&:]