I HAVE FOR YOUR CONSIDERATION A FAIRBANKS AND MORSE TYPE R1 ROTARY/IMPULSE MAGNETO. THIS MAG WAS FACTORY INSTALLED ON A 3HP OR 6HP FAIRBANKS AND MORSE MODEL Z. THIS WAS A REPLACEMENT FOR THE BOSCH AB33. IT HAS THE 25 TOOTH GEAR. THIS IS ONLY FOR THE STRAIGHT CUT GEAR ENGINES. IF YOU HAVE A LATER ANGLE GEARED ENGINE, THIS WILL NOT WORK. THE MAG IS EXTREMELY HOT, AND THROWS A NICE BLUE HOT SPARK. THE MOUNTING PLATE HOLES ARE 3 7/8 ON CENTER. WE WILL TRY OUR BEST TO GIVE YOU AN ACCURATE AND HONEST DESCRIPTION OF THE ITEMS LISTING THE GOODS AND THE BAD’S. LET THE PICTURES PROVIDED BE YOUR GUIDE. PLEASE VIEW OUR ITEMS OFTEN SINCE WE WILL BE LISTING MORE HIT MISS GAS ENGINE PARTS AND ENGINES THROUGHOUT THE YEAR.