Hey Lane, You guys have lots of info, so they dont use a running timing, they do it by measurement and not degrees. Lot of the bigger bikes have a centrifical timing advance and use weights and springs..Like the older cars, now cars use a computer and sensors, I know on the faster autos like Corvette and camaro you can change the computer chip To go faster, Im going to take a flywheel to machine shop and get 2 more slots cut and give it a whirl! Gonna use one off a AMF, since I have plenty to spare, it will be a crapshoot on the very first one...will post results on it, then try a Tomos A5..I know alot of you guys have it, Doug D