Hi Eric,Jez,
I've been following your thread with interest as I've just finished my Comet special and was playing with carb and ignition issue.
I'm now happy with the bike so far, even though it has only 200 miles under its wheels.
I don't know if this can help you but here are the bike's spec:
90mm bore, 8:1 Omega
1034 concentric: 30, 106, 250, 622/122 needle 2nd groove, 3 1/2 valve.
I'm not sure about the main jet at the moment as all is brand new I don't want to try WOT until it's run in.
Ignition: Ford Fiesta points (by François Grosset), single plug, Lucas condenser.
The bike start first kick cold (don't like to be over flooded though), warm or hot. I mention "warm" because I have a Sunbeam twin which start readily cold or hot but is real pig when just warm.
After 34 years I never solved this problem so I just live with it every day as this bike is my ride to work, I don't own a car or a modern bike.
Cheers.
Just jealous of where you live for a start! Used to spend a lot of time avec notre famille française
à Bisacarosse, and windsurfing nr Lacanau and up and down that seaboard, markets etc......ahh memories! Got to ask, and i know this is off track but do hope the fires near you have not been too bad? Bushfires are no fun at all..
Grosset parts - sounds like a beautiful machine indeed, and that info about the 1034 is really interesting -using a setup same as my 500cc engine, same piston ratio -but bigger main at 250...it is 4mm bigger of course, even so the 930 premiere only uses a 220, others are smaller...Carbwise, thinking about a 600 for a starting point, better knowing it will be too rich, and working backwards. Its only at full throttle my engine popped, so in that last 1/3 throttle 320 main, needle middle of 3 groves -its where the fuelling is likely critical, mine was just very lean as we found out...but think the starting is ok, cold and hot -it now just starts...but we did need to set it up with twin plugs to do it -hey ho, c'est la vie!
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