First of all, if it has a 25 degree drive cup, the lag angle should be set for 25 degrees. Then you need to time the static start/impulse so she SNAPS/IMPULSES right at TDC, thats (for left cylinder) when the Flywheels Left Hand Impulse (LHI) is at the flat mark on the tractors side located in the 3 O Clock position. Get her so she fires (snaps/impulses) left cylinder at TDC when slowly cranking so she can start good and then if the lag angle is set at 25 once running and over 250 RPM the run time advance kicks in and she should be firing about 25 BTDC which is where you want it.
If you loosen the bolts and rotate the mag forward CW that retards the spark while backwards CCW advances it. Adjusting the lag angle in the rear of mag affects ONLY start timing but rotating the entire mag in the flange affects both start and run timing.
This is ONLY a starting point, Ive never published an entire mag timing procedure. When I give Seminar Workshops on Wico C and X Mags I spend maybe 15 to 20 minutes describing this and thats to much typing for now lol
JD H Publications and Duane Larsons literature pretty well covers all this, get some manuals n study them and the literature I just mentioend then post back any questions..
SHORT ANSWER, ADJUST LAG ANGLE, THEN YESSSSSSS STATIC TIME IT SO SHE SNAPS N FIRES THE LEFT CYLINDER WHEN LHI IS AT 3 O CLOCK
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