i have a 28cc r&d head, non gridle, wet pipe, porting, 5 degree advance Vilder flywheel, wet wolf shortie cone, 82mm nozzle, and 85mm steering nozzle, 13/22 solas, and i run 93 octane at 40:1, i run the crap out of it, wot all the time without anyproblems
amazingly i only pull about 7000, i think i can tune the top out a little more, i a have advent programming some new curves for me, can't wait!!!!!