I am in the process of rebuilding about 4 two cyl pony mags am woundering if anyone knows what the length of the spark should be for a given input rpm. Also is there an outfit that is capable for remagnitising the horseshoe magnet that seem to be very weak? Jim
The MJK series magnetos (without impulse coupling) should produce a 9mm spark at 200 rpm.
Not sure who provides remagnetizing service....might try Standard Magnetos.