First of all, thank you for approving me to the forum! I'm a proud owner of 3 brit bikes, -71 Triumph NRE 750, N15CS -66 and 920cc Commando with 270°crank. Since I'm a Finn, I'll go straight to the topic... ;-D I've spend a lot of time trying to find correct timing advance and fuel mixtures with these bikes. Most of the time with Boyer ignition and Amal/Mikuni VM's. I've always felt that I can't find no satisfactory compromise in those areas when it comes to tuning these engines up. Now that I've once again found myself mixed with EFI:ying (that's not a word) an old air cooled engine, it crossed my mind: why not try to ask more experienced people to what they think. So, the question is in general: if you could choose the ignition advance what you get when you twist the throttle and what kind of AFR you are aiming to when doing so, what could it be in numbers? I know that this is extremely complex topic and there is no simple answer to this, but... I'll attach the tables I've created to start with my 920cc 270°crank Commando EFI engine. This is not a racing engine mechanically, but a bit tuned up. I don't want this to be a EFI topic but a general question of ideal ignition advance and fuel mixture in couple of different load situations, TPS vs. RPM. Appreciate any comments on this. And I hope that this is not too much off place where to ask this question. Hope the images show. If not I'll post them some how.