I have played with the timing a bit , it was at 8 degrees advanced , and now at around 10 at 800-900 r.p.m.'s anything below that and it wiil stall.It seems a lot better. Not sure of the mech. advance but it is working ,when I rev it it definately moves up the scale. I need timing tape ,or a good advance light.I would love to see this thing on the strip I believe it would make good numbers with wider tires. It is running better than it has since it was new in 76!!!