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News and On This Day
David Tompkins Vincent at Daytona
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<blockquote data-quote="Keith Martin" data-source="post: 150350" data-attributes="member: 1895"><p>I have had the pleasure of looking over David's Comet and seeing it in action. The bike is very well set up with attention paid to every detail. I really like it. David also rides hard!</p><p>The Comet is in AHRMA Class C category. The cut off year is 1951 for Class C bikes. 4 speed gearboxes only. Limited carb sizes for twin cylinder bikes. No featherbed framed Nortons. The Comet is one of the only bikes with a swing frame that fits into Class C. A nice advantage especially when the suspension is dialed in like David's bike. Alex is riding a plunger frame Norton that goes well but the plunger rear is not the best with modern tires.</p><p>We won the Class C championship a few times running a rigid frame Triumph T100 pre unit. Worked over the front end to help handling. We ran later unit yokes that do not have the rake that the pre unit yokes have. Moved the steering head angle back bit. This loaded the front tire more and quickened the steering. It would cook a front tire in one weekend of racing. We used a 5 speed cluster inside the gearbox case with 1st gear blocked off. The shifting on a Triumph 5 speed is so much better than the 4 speed box. We just started the race in 2nd gear and downshifting into turns so much smoother making for better lap times. </p><p>Nourish crankshaft, Thunder Engineering rods and Newby belt drive. Sold it a few years ago to a racer in the UK. We named the bike "Stiffy" as the rear suspension was always on the stiff side.</p><p></p><p>[ATTACH=full]46652[/ATTACH]</p></blockquote><p></p>
[QUOTE="Keith Martin, post: 150350, member: 1895"] I have had the pleasure of looking over David's Comet and seeing it in action. The bike is very well set up with attention paid to every detail. I really like it. David also rides hard! The Comet is in AHRMA Class C category. The cut off year is 1951 for Class C bikes. 4 speed gearboxes only. Limited carb sizes for twin cylinder bikes. No featherbed framed Nortons. The Comet is one of the only bikes with a swing frame that fits into Class C. A nice advantage especially when the suspension is dialed in like David's bike. Alex is riding a plunger frame Norton that goes well but the plunger rear is not the best with modern tires. We won the Class C championship a few times running a rigid frame Triumph T100 pre unit. Worked over the front end to help handling. We ran later unit yokes that do not have the rake that the pre unit yokes have. Moved the steering head angle back bit. This loaded the front tire more and quickened the steering. It would cook a front tire in one weekend of racing. We used a 5 speed cluster inside the gearbox case with 1st gear blocked off. The shifting on a Triumph 5 speed is so much better than the 4 speed box. We just started the race in 2nd gear and downshifting into turns so much smoother making for better lap times. Nourish crankshaft, Thunder Engineering rods and Newby belt drive. Sold it a few years ago to a racer in the UK. We named the bike "Stiffy" as the rear suspension was always on the stiff side. [ATTACH type="full"]46652[/ATTACH] [/QUOTE]
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News and On This Day
David Tompkins Vincent at Daytona
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