Okay Im familiar with that Mag on a two cylinder Deere application but not so on a 4 banger or opposite direction rotation BUT I STILL BELIEVE THIS TO BE TRUE.....
1) If you loosen the 4 screws and rotate the stop plate THAT INDEED AFFECTS START/IMPULSE TIMING BUT NOTTTTTTTTTT RUN TIMING.....
2) Rotating the stop plate can indeed cause it to trip/impule sooner or later and thats how I rough in the start/impulse timing so she fires at TDC at slow cranking so she dotn kick back. Right at TCC is when you want it to snap because if before she kicks back yet if too much after she dont start as well.
3) AFTER I set the lag angle (how much start timing lags run time advance) by rotation of the stop plate, then I fine tune the start timing by rotating the mag in its mount flange THAT WAY YOU CAN GET IT RIGHT ON TDC (assuming stop plate lag angle is correct and drive gear is in time) WHEN SHE SNAPS.
4) On the Deeres those witness marks represent 5 degrees each.
5) I FIRST set the lag angle by rotation of the stop plate, if the drive cup is say a 25 degree cup then since I want the start time to lag the run time by 25 I set it accordingly (on the Deeres straight up center = 12 1/2 degrees lag so 2 1/2 more marks = 25),,,,,,,,then I insert the mag and fine tune adjust the start timing to TDC by rotating the mag in the flange
NOT familiar with IHC but if I were you Id FIRST see if you can rotate the entire mag in its flange so she snaps at TDC but if thats not possible then go in the rear and adjust the stop plate a little at a time (each mark = 5 degrees) until you can get it to snap at TDC
NO WARRANTY IM NOT AN IHC USE MAG GUY
John T headed to a Bluegrss fest so may not get back at ya
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