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Unfortunately you need that inspection cap off and the casing put back on to retime it correctly. The marks on the rotor align with marks in the cover.
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Thanks Tony, I hadn't even considered timing yet. This is going to be a steep learning curve. I'm guessing that as there is no distributor, the timing is set in there? I will carefully remove the inspection cap. I hope I haven't altered the timing by removing the casing and putting it back. Another dumb question, but is there a separate coil for each head? I've only seen one, but it only goes to the rear cylinder.
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I was talking about cam timing rather than ignition timing.
The ignition timing is set and doesn't need adjustment, the trigger and pickup is in the RH side clutch case.
The cam timing refers to the relationship between the crank and each set of cams. Effectively, this engine is two big singles on a common crank as far as cam timing and carbs are concerned.
Yes, there is a separate coil for each head. Follow the leads back to locate them.