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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
What Carburettor are you using on your racing Comet?
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<blockquote data-quote="davidd" data-source="post: 110325" data-attributes="member: 1177"><p>The Flash came with an 1-1/2" GP for the big port head. Coburn kept the carb from the BSA Goldstar that he traded to Sid Dickson when he swapped the Goldstar for the Flash. He installed a smaller carb on the BSA. It worked exceptionally well. I do not know what rules Ben is trying to meet, so I stuck with 34mm and smaller.</p><p></p><p>The TT carbs work well. They are easy to set up and very simple to tune. The GP and Dellorto take some skill to tune. There is a learning curve. Even if you tune them on a dyno, the dyno guy needs to know what he is doing. Not so with the more ubiquitous Amals.</p><p></p><p>You have to replace the slides, needles and jets every year if you are really racing. That can get expensive with hard to find parts. You also want have extra parts and different combinations available to use. This means it is nice if the parts are widely available.</p><p></p><p>I got very high BHP out of this 1-7/16" the first time on the dyno. But, without a large selection of slides, needles and jets I could not tune it to run well on the track.</p><p>[ATTACH=full]28889[/ATTACH]</p><p>I went back to the 32mm 10TT9 and did well enough for podium finishes in the national championships. With everything else going on I did not have the time and money to devote to developing the carb, manifold and exhaust to get the maximum power and tractability. On the other hand, I was getting everything out of the other carbs I was using because they were so well known and easy to get parts for.</p><p></p><p>The 32mm TT:</p><p>[ATTACH=full]28890[/ATTACH]</p><p>The 34mm Concentric:</p><p>[ATTACH=full]28891[/ATTACH]</p><p>The Mk2 smoothbore:</p><p>[ATTACH=full]28892[/ATTACH]</p><p>The 1-1/2 GP on the big port head ( I have the wrong angle float bowl on it):</p><p>[ATTACH=full]28893[/ATTACH]</p><p>The manifolds are fabricated on all of these except the 32mm 10TT9, which is stock Grey Flash.</p><p></p><p>I did run an 1-1/4" clip fit GP for a while. I can't remember the issues I had with it, but the 10TT9 seemed to work better. When I sold my racer to Randy Hoffman I loaned him the 10TT9. When I got it back he ran the GP, but told me the 10TT9 was better.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 110325, member: 1177"] The Flash came with an 1-1/2" GP for the big port head. Coburn kept the carb from the BSA Goldstar that he traded to Sid Dickson when he swapped the Goldstar for the Flash. He installed a smaller carb on the BSA. It worked exceptionally well. I do not know what rules Ben is trying to meet, so I stuck with 34mm and smaller. The TT carbs work well. They are easy to set up and very simple to tune. The GP and Dellorto take some skill to tune. There is a learning curve. Even if you tune them on a dyno, the dyno guy needs to know what he is doing. Not so with the more ubiquitous Amals. You have to replace the slides, needles and jets every year if you are really racing. That can get expensive with hard to find parts. You also want have extra parts and different combinations available to use. This means it is nice if the parts are widely available. I got very high BHP out of this 1-7/16" the first time on the dyno. But, without a large selection of slides, needles and jets I could not tune it to run well on the track. [ATTACH type="full" alt="100_0275.jpg"]28889[/ATTACH] I went back to the 32mm 10TT9 and did well enough for podium finishes in the national championships. With everything else going on I did not have the time and money to devote to developing the carb, manifold and exhaust to get the maximum power and tractability. On the other hand, I was getting everything out of the other carbs I was using because they were so well known and easy to get parts for. The 32mm TT: [ATTACH type="full" alt="32mm Flash 1.jpg"]28890[/ATTACH] The 34mm Concentric: [ATTACH type="full" alt="34mm Tompkins 1.jpg"]28891[/ATTACH] The Mk2 smoothbore: [ATTACH type="full" alt="100_0011.jpg"]28892[/ATTACH] The 1-1/2 GP on the big port head ( I have the wrong angle float bowl on it): [ATTACH type="full" alt="DSCN3377.jpg"]28893[/ATTACH] The manifolds are fabricated on all of these except the 32mm 10TT9, which is stock Grey Flash. I did run an 1-1/4" clip fit GP for a while. I can't remember the issues I had with it, but the 10TT9 seemed to work better. When I sold my racer to Randy Hoffman I loaned him the 10TT9. When I got it back he ran the GP, but told me the 10TT9 was better. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
What Carburettor are you using on your racing Comet?
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