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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Carb for Comet
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<blockquote data-quote="chankly bore" data-source="post: 28930" data-attributes="member: 317"><p>I have a standard Comet with an overhauled Type 29 carburettor, Mk3 cams and an unrestricted exhaust (nearly straght through) and I have a 21" front wheel, therefore the speedo IS accurate.My thing is happy at 60 m.p.h.The piston is about 8:1.In your place I would go for a straight through pipe or "silencer" and a 30 mm.or 32 mm. Mikuni. The Vincent head was designed for 72 octane and about 6.8:1 compression,so without a different head you are pushing a snowball uphill with pointy-toed shoes as far as extracting performance.I think a lot of 70 m.p.h. Comets have 19" wheels on the front-if you take my meaning.Sure any good Comet, mine included,will sit on 65, but get off the major roads,slow down, stop worrying about the interstate truck sitting on your clacker and enjoy what the 'bike was designed for.Just remember,a lot of it is 60 years old.By the way,some owners locally say that premium fuel will reduce your chances of a nip-up.Ignition advance 35 degrees BTDC maximum!!Cheers,F5AB/2A/7945 since 1970.</p></blockquote><p></p>
[QUOTE="chankly bore, post: 28930, member: 317"] I have a standard Comet with an overhauled Type 29 carburettor, Mk3 cams and an unrestricted exhaust (nearly straght through) and I have a 21" front wheel, therefore the speedo IS accurate.My thing is happy at 60 m.p.h.The piston is about 8:1.In your place I would go for a straight through pipe or "silencer" and a 30 mm.or 32 mm. Mikuni. The Vincent head was designed for 72 octane and about 6.8:1 compression,so without a different head you are pushing a snowball uphill with pointy-toed shoes as far as extracting performance.I think a lot of 70 m.p.h. Comets have 19" wheels on the front-if you take my meaning.Sure any good Comet, mine included,will sit on 65, but get off the major roads,slow down, stop worrying about the interstate truck sitting on your clacker and enjoy what the 'bike was designed for.Just remember,a lot of it is 60 years old.By the way,some owners locally say that premium fuel will reduce your chances of a nip-up.Ignition advance 35 degrees BTDC maximum!!Cheers,F5AB/2A/7945 since 1970. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Carb for Comet
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