Having measured my ignition timing with a pointer on the front cylinder, I believe my ignition is significantly too far retarded.
I've checked the seating of the contact breaker in the BTH magneto and the taper key is sitting correctly in its groove on the end of the armature. At the drive end of the magneto, the peg unit is on a woodruff key, so cannot be moved on the armature taper.
So, if I'm not mistaken, that only leaves the magneto driving gear with its slot... and the idler gear that drive that. In the photo below, the piston is at top dead centre. Can someone advise if that slot looks to be in the correct place?
Many thanks
Paul