OK guys, sorry for not posting what I did.
We tooke the head off and the valves were in the right position, from the top, the left valve has a relief ground on 2-teeth, and this lines up with the groove on the shaft.
On the right valve, the teeth also have the relief ground, but no groove on the shaft?? What does this mean?
I lined up the valve at a mirror of the one on the left and put it together. No change at all, still drops off on top like it's starving for gas, if you stay on the throttle, it slowly comes up to RPM.
HELP please