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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dutch made twin primary cover for Newby belt drive
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<blockquote data-quote="Tom Gaynor" data-source="post: 18894" data-attributes="member: 4034"><p><strong>Newby</strong></p><p></p><p>I've raced with a Newby clutch and belt drive (500 Manx Norton) since 1993. I broke a belt once when a stone got in, and have had to replace the front pulley once. The ally pulley is fitted to a steel shaft via straight splines, eventually 52 bhp hammers the splines loose, and the more slack there is, the more effective the hammering becomes. But that's it. 16 years racing, well over 300 full power starts, and I've bought three belts (one spare), and one pulley. One bit of advice: buy two extra steel plates. Put one under the ally pressure plate, because otherwise the friction plate underneath will rip up the pressure plate. Weld a handle to the other plate, and you have a highly effective clutch locking tool.</p><p>No, two bits of advice: ignore instructions to tension the belt by twisting it. Make sure that when the motor is hot you have at least an inch (2 1/2 Dutch inches...) of up and down play. Too slack isn't a problem. Too tight, is. </p><p>Really neat job, Osman, congratulations. The cover is a work of art. Keep us all posted on progress.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 18894, member: 4034"] [b]Newby[/b] I've raced with a Newby clutch and belt drive (500 Manx Norton) since 1993. I broke a belt once when a stone got in, and have had to replace the front pulley once. The ally pulley is fitted to a steel shaft via straight splines, eventually 52 bhp hammers the splines loose, and the more slack there is, the more effective the hammering becomes. But that's it. 16 years racing, well over 300 full power starts, and I've bought three belts (one spare), and one pulley. One bit of advice: buy two extra steel plates. Put one under the ally pressure plate, because otherwise the friction plate underneath will rip up the pressure plate. Weld a handle to the other plate, and you have a highly effective clutch locking tool. No, two bits of advice: ignore instructions to tension the belt by twisting it. Make sure that when the motor is hot you have at least an inch (2 1/2 Dutch inches...) of up and down play. Too slack isn't a problem. Too tight, is. Really neat job, Osman, congratulations. The cover is a work of art. Keep us all posted on progress. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dutch made twin primary cover for Newby belt drive
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