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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Sid here . Topic . Clutch tips both the original and multiplate .
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<blockquote data-quote="Big Sid" data-source="post: 38897" data-attributes="member: 2781"><p>The Vincent lift mechanism suffers from short lifting travel and poor strength in the right side arm G91 . Too mush spring pressure and this bends , distorts reducing travel . Only redesign will correct this weakness , so one must work around it . And this affects outer plate lift off in any clutch used . </p><p> First one must increase travel of the pushrod focusing on the handlebar lever and the inner tip of G94 . The hb lever s abutting tips are ground back evenly nearing an eighth inch to increase its swing , and the sharp end of G 94 is likewise carefully ground back on its tip to provide greater travel of the lever G 91 . Be careful not to remove too much ruining it . Then the clutch cable is readjusted to take advantage Of the greater travel these two changes offer . And then you must readjust the cover adjustor to suit the cable travel and still allow a wee bit of inner arm slack before contact with the pushrod . Be sure to use plenty of HMP grease on the inner moving surfaces and that the bottom of the inner arm slides freely . </p><p> Now you have maximum rod travel possible . The Works method of checking for clean clutch release is to select fourth gear , lift the clutch and spin the rear wheel . If all is well it should spin very easily , almost as if in neutral . </p><p> With a multiplate all of that applies equally . We use Videans latest V 3 unit in our Vincati , a lovely piece of gear . However it suffers from too much spring pressure and needs only every other cup and spring , ie. three , not six . Iff this proves too soft then pop in a washer to increase those remaining applied pressure . Neal also offers slightly heavier springs if needed , still using only three . </p><p>This change gives a easy lift without stressing the inner arm G 91 , giving a sweet action and max liftoff . </p><p> We run it slightly wet to eliminate wear but reduce drag by going to synth . ATF IN THE PRIMARY , and admitting it to the clutch chamber with a single one quarter inch drilled hole sited behind the clutch exactly at the normal primary fluid level . Before assembly of the clutch soak its friction plates overnite in the same ATF , draining well before proceeding the following day . </p><p> Adjust the center throw off closely but careful to leave a quarter inch of lever travel at the bar before any lift is felt . There you are , go enjoy ! It will improve as the plate surfaces smooth off giving even cleaner release . </p><p> You should do what is possible to lessen transfer of motor oil into the primary case as this will dilute gradually the new fluid . </p><p> With the ORIGINAL Vincent clutch . A few reminders will give improved function and freeing off . </p><p> The centralizing plungers should compress nicely with a firm thumb squeeze , both of them , not come up solid before 3/4 s of their travel . They must extend out and firmly press on their pins when at rest , both of them . There must be about 25 thou clearance around the inner drum surface and the lining segments to allow for drum wobble , this always there at idle with clutch lifted . </p><p> The ends of all segments must be champhered back , no sharp leading edges , both ends to give smooth engagement . No oil in the assembly as it will be flung out into the drum spoiling grip . </p><p> All the earlier adjustment details still apply . These all seem simple but must be as described . Good luck . Sid .</p></blockquote><p></p>
[QUOTE="Big Sid, post: 38897, member: 2781"] The Vincent lift mechanism suffers from short lifting travel and poor strength in the right side arm G91 . Too mush spring pressure and this bends , distorts reducing travel . Only redesign will correct this weakness , so one must work around it . And this affects outer plate lift off in any clutch used . First one must increase travel of the pushrod focusing on the handlebar lever and the inner tip of G94 . The hb lever s abutting tips are ground back evenly nearing an eighth inch to increase its swing , and the sharp end of G 94 is likewise carefully ground back on its tip to provide greater travel of the lever G 91 . Be careful not to remove too much ruining it . Then the clutch cable is readjusted to take advantage Of the greater travel these two changes offer . And then you must readjust the cover adjustor to suit the cable travel and still allow a wee bit of inner arm slack before contact with the pushrod . Be sure to use plenty of HMP grease on the inner moving surfaces and that the bottom of the inner arm slides freely . Now you have maximum rod travel possible . The Works method of checking for clean clutch release is to select fourth gear , lift the clutch and spin the rear wheel . If all is well it should spin very easily , almost as if in neutral . With a multiplate all of that applies equally . We use Videans latest V 3 unit in our Vincati , a lovely piece of gear . However it suffers from too much spring pressure and needs only every other cup and spring , ie. three , not six . Iff this proves too soft then pop in a washer to increase those remaining applied pressure . Neal also offers slightly heavier springs if needed , still using only three . This change gives a easy lift without stressing the inner arm G 91 , giving a sweet action and max liftoff . We run it slightly wet to eliminate wear but reduce drag by going to synth . ATF IN THE PRIMARY , and admitting it to the clutch chamber with a single one quarter inch drilled hole sited behind the clutch exactly at the normal primary fluid level . Before assembly of the clutch soak its friction plates overnite in the same ATF , draining well before proceeding the following day . Adjust the center throw off closely but careful to leave a quarter inch of lever travel at the bar before any lift is felt . There you are , go enjoy ! It will improve as the plate surfaces smooth off giving even cleaner release . You should do what is possible to lessen transfer of motor oil into the primary case as this will dilute gradually the new fluid . With the ORIGINAL Vincent clutch . A few reminders will give improved function and freeing off . The centralizing plungers should compress nicely with a firm thumb squeeze , both of them , not come up solid before 3/4 s of their travel . They must extend out and firmly press on their pins when at rest , both of them . There must be about 25 thou clearance around the inner drum surface and the lining segments to allow for drum wobble , this always there at idle with clutch lifted . The ends of all segments must be champhered back , no sharp leading edges , both ends to give smooth engagement . No oil in the assembly as it will be flung out into the drum spoiling grip . All the earlier adjustment details still apply . These all seem simple but must be as described . Good luck . Sid . [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Sid here . Topic . Clutch tips both the original and multiplate .
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