Posted by Pat Fought on February 07, 1998 at 07:33:17:
to check the timing on my m37 with sealed ignition i have found that if you use a short piece of ignition wire (steel core)inserted into the shielded spark plug and the other end wrapped around the spring on the shielded plug wire you can use a regular inductance timing light. use a 12 volt battery charger to power the timing light...works for me. now if i just knew how far to advance the timing.....