A little more progress. This is the primary drive and starter system mocked up in final form. I did have to make some changes. Originally, I moved the gearbox over .250" to the left, as I had done on my race bike back in the day. Turns out that isn't going to work here. The ring gear on the clutch basket takes up some of the space on the belt pulley part of the clutch, so I can only move the gearbox over by .125", unless I want to move the engine pulley outboard by another .125"+. I don't want to do that, because that would also mean moving the alternator rotor out that much, making a new rotor nut in the process, and reducing the amount of shaft support for the rotor. It's not that it's impossible, but it doesn't seem like a good plan to me. The extra .125" will give me enough chain clearance for any tire I might want to run on the rear wheel I'm using. I originally moved the gearbox over to allow a wider rear tire, and in the beginning I was planning to have enough room for a modern 17" rear tire, just in case I chose to do that in the future. Giving that option up doesn't bother me much. I still need to keep it at least .125" offset so the clutch basket will clear my wider swingarm at the pivot.
Now I'm back to fabricating a primary cover, and I should be done with this part of the job.
For carbs, I've decided to run the 36 mm Amal Mk2s, mostly because they fit. These are the carbs I've been running on my landspeed Norton, but now I'm going to larger carbs on it, so these are available. I've got a new set of chorme plated brass slides from Burlen for the carbs, and I'm going to try some slightly lighter return springs. That should at least get the bike running. If it doesn't work out, I can always try something different later.
Still waiting to paint the wheels. It's been cold and wet lately, and I haven't had a good opportunity to paint.
Ken