Not exact but just what some of you guys line your timing up to
Or#3 you can hold that big black wire and spin the flywheel and make a mental note of where the magnet is when it just passes the right hand coil leg,That should work I thinkSori, but I think you only have two(2) choices...#1, you simply install the f/w w/ the 'key' (stock or stepped) in place...or #2, you puchase a timing lite and a degree wheel and learn how too use it....accuriately. JMO
Yes he's correct it fires as it leaves the right side coil leg with ARC flywheels; stock wheels are anybody guessI think Kart43 knows what he's talking about. I have checked stock flywheels that fired all over the place, but since I started using my timing light (and only use good flywheels) I haven't even really looked at where the coil was firing , as far as the magnet position.
These coils have internal circuitry that causes a capactive discharge, it will happen each time the magnet passes a certain point on the coil. The timing differences some measure are due to tolerances that occur at the crank shaft and or flywheel keyway location. The timing retards as the electronics cannot keep up with the rate that the magnetic field interacts with the core of the coil as the RPM increases, It's not so much that the firing point changes, it is where the crank shaft ends up by the time the spark reaches the tip of the plug.