Well, I like the DRV2B on my B as it is the correct one and it has always started and ran great once I got it properly installed.
The DRV2 mags are a different animal! I scratched my head trying to install my first one until the Mag Wizard, Duane Larson took the time to walk me thru it. The DRV2A and DRV2B are the same except the mag body is rotated 90 degrees on the B. Below are the instructions Duane gave me:
"Rotate flywheel until flywheel side piston is at top of compression stroke, and LH Impulse is then lined up with mark on transmission case and the magneto drive flange should be horizontal. Your magneto does the following: click(spark)-click(spark)-click(no spark)-click(no spark) and the pattern repeats. Hold your magneto in a vise like it will be mounted on the tractor, and run a plug wire from the bottom (forward on the B) HV outlet to a plug laying on the vise. Rotate your magneto until you get a spark at the plug, and stop immediately after the spark occurs. The drive flange should be close to horizontal and mate up with the driving flange on the end of the governor shaft. Bolt the magneto in place, and run the bottom plug wire to the flywheel side plug and the top wire to the pulley side plug. Then I would adjust the running timing (by rotating the magneto within the slots) with a timing light. There is no adjustment for the impulse (or starting) timing on the DRV2A. "
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