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dave bushell

When timing my Brum (1957), I set the timing as Colin mentions, which is a good basic setting to get the engine running. I leave the distributor clamp ring just loose enough so that I can turn the distributor by hand and without it being able to move by itself through engine vibration.
I then take the bike bike out for a run, and when it is up to temperature, rotate the distributor as I’m riding to the position that gives the best running and response on the level and on slight inclines. Then I clamp up the distributor.