Great thread! Sure brings back some great memory's.
I used to ride 490's on short hard pan tracks in Nocal - Baylands, Santa Clara PAL etc and found out that the bike flat hooked up by lowering the compression. I stacked two copper head gaskets on top and let her rip.
KTM 950 SE
CRF450 flat tracker
Get on with riding or get on with dying - one or the other