I have tested on a steep incline but not at high speed. I am waiting for most of the oil to drain away & will test again.
I'm fully ready to have to reline the discs again but hoping not.
Hi Lonewolf
Did you ever get to the bottom of this as I'm having the same issue and have worked on the car for 3 days now but still need the choke to prevent it from backfiring into the carb.