[zrayr]

Originally Posted by Brent Mills

That's either the cam with too much overlap as Z. Ray suggests or it's a lean condition. The only reason I shy away from it being too lean is because you note that it starts happening after things are warmed up, which tends to make the A/F ratio go more rich. Maybe post your cam specs and your carb specs (idle/main jets, chokes, correctors, etc, etc).

Brent,

do you know the cam spec parameters for using Webers ?

thanks,

Z. Ray