AC B Magneto troubles

HAve AC B that my cousin bought. I have helped out a little to get it running. It ran rough when he bought it. It is a 38 and only has hand crank, no electrics. He could not get it started when he got it home. He rebuilt the carb. Still no start, no pull starting either. It had suppression wires on it. I put copper wires, new plugs, new points and condensor, and cleaned rotor and cap. It started when pulled. I left. Never started again.
checked timing. Way off. The impulse was off and the rotor location was off. I reset the impulse by turning the govenor until it clicked when TDC was achieved. Reset the rotor so that when I clicked on TDC on #1 it then was pointing as #1. IT fired right up. (by the way the timing marks on the geard were way off now, someone had been in the motor) I started several times and ran smoothly. I noticed the carb was out of adjustment but then asked here and now know how to adjust it. He dismantled tractor to istall foot brakes, new torque tube for starter istallation, and PTO and hydraulics. Now it is reassembled and the magneto is acting up again. The impulse(the clicking) only works sometimes. They were going to reset the timing from TDC to Fire so that it had the proper advance. Sometimes it clicks, sometimes not. THey took off the mag, turned it by hand, everything fine. put it back on and it works ten times or so, then stops, then it starts clicking again. any ideas????? ??

Thanks.

I don't have a clear drawing of the pawls.

Thanks for your reply though.

I stopped in tonight and they were finishing up the change over. They noticed that if they had the throttle all the way back towards no idle, the clicking would stop. If they moved it to about half throttle it would start clicking again. I told them that was bad, they looked at me funny. They have borrowed an IT manual and I looked for spacers or something. They also told me they noticed that the govenor(or the thingy in the hole that moved the magneto - as they put it - would move in and out if you pushed it.)

What I found was that the bushing that the shaft rode in had walked out and was barely hanging on. I was able to push it in about 1/8th. of an inch with my finger. The govenor was backing away from the magneto and throwing it 180 degrees out of time. It was luck of the draw when it tried to start. Sometimes it was in time, other times it was 180 out. This would explain why they timed the tractor, it started and ran smooth. They turned it off and when they tried to restart, it backfired.

They are going to take the bushing out tomorrow, apply some green loctite and reinstall it completely. That should solve their problems. I have never heard of this happening but this is also my first AC to work on. I am a farmall A and Cub man.

Thanks for everything..

p