Huntmaster chopper Timing question

[Davidmeachen]

Hi again guys, if you read my previous blogg concerning the magneto timing having slipped then you have an idea as to what is happening with my FH engine. The advance/retard mechanism seems in good order and no teeth missing from the idler cog so ready to re-time the mag. I can get the right-hand piston to the required 11/32" BTDC. I've wedged the advance/retard in the full advance position and placed it loosely on the tapered mag shaft. The lower pick-up on the outside of the mag feeds the HT to the right-hand plug and the pick-up on the top of the mag feeds the left plug. The contacts move in a clockwise motion. Now the question: Looking at the contact breakers and the pad on the pivoting contact which moves around the cam-ring, should the pad be coming to the bottom of the cam-ring (at approx 4 o'clock) or should the pad be nearing the top of the cam-ring (approx 10 o'clock). I'm trying to find out whether its the top or the bottom of the cam-ring that fires the bottom pick-up which feeds the right hand plug
As always any advice gratefully received
Thanks guys

[Graham.Goral]

Hi David, the position of the points should be loosely opposite the HT pickup for the cylinder being timed - so opposite the lower pickup in your case. Check your timing carefully after tightening, as tightening the nut can move the advance/retard unit a little as it moves down onto the taper. Took me a few attempts.
Cheers

[Davidmeachen]

Hi Graham and thanks for the tip