I never try and explain how points should be set. Mathilda had more than half a cm of play on the cam caused by cracks radiating outwards from the bearing housing in the main crankcase itself.
So I ended up learning points the wrong way around. I learnt about how the clutch, points, and carb systems overlap instead of starting properly by distinguishing these systems seperately. Nobody believes me that i can adust any one of these systems to compensate for what might be lacking in either of the other two systems.
Anyway, points are set by first finding TDC. That's the highest point the piston reaches. (1) Then measuring the right point BTDC (before Top Dead Centre) for the points to start opening. The most fixed measurement I have found is 3.5cms BTDC. You could do this by removing a silencer bent pipe and probably using a permanent marker on the piston inside to figure it out. (2) Next to set the range, according to how much the points should be closing, at TDC. (3) Vary this range by rotating the entire magnet assembly and not the face plate on which the points are mounted. (4) Beyond this point, the bike's individual characterstics take over.
So there is no point :)in explaining it any further.
Oh yea, the lower pic is of the 350cc twin Jawa.
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