I think I have low compression ratio so I timed it to 10 degrees at idle. I got the popping figured out I swamped carburators with another 700 double pumper. But I think now its running rich. I don't know if theres different squirters or jets in this one I didn't have time to compare with the other 700. When I floor it off the line it kind of stumbles then some black smoke rolls out of the pipes. I have pipes coming out the hood so I can tell this. It goes pretty good after that. But then even through the RPM range a little black smoke rolls out. Should I try going with some smaller squirters for off line problems and some smaller jets for the black smoke. If so how much smaller should I go.