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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Best input sought to update front and rear suspension ?
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<blockquote data-quote="Big Sid" data-source="post: 37144" data-attributes="member: 2781"><p>I'll relate a few comments and cautions about the suspension peculiarities on our Vincents . </p><p> These are actual situations I've come across affecting handling characteristics , even introducing dangerous possibilities . </p><p> We had a nice looking C Rapide end up in being ours , it's owner fearful of it for reasons not understood . We soon learned it felt like it was going to throw the rider and itself down the road if the surface was rough . Weird and truly scary to ride . Turns out there was a poor choice of front damper and it's lower eye bolts causing the problem . also it had a funny snapping noise when power was rolled on , but first the handling quirk . </p><p> When the front wheel was raised off the floor allowing the forks to fully extend it was observed that the front fender rear section actually came in contact with the mag cowl hard enough to stop the fork from swinging across the center position </p><p>towards left or right . But why ? The fender and rear brace looked normal , what explained the contact ? </p><p> To do this the fork had to be going further down and so rearwards , but why . </p><p> I removed the front hyd. damper complete with the lower eye bolts FF 57 . The damper was a Koni , often found on Vincents and when compared with an original Vincent damper , both fully extended , it was seen that the Koni was longer . Then examining the eye bolts these were the later longer ones used on the D models with the Armstrong dampers . Could that be it ? you betcha ! Together they allowed the fork to extend further and so contact the cowl . Problem solved . I swapped out these parts with an original damper and the earlier eye bolts and handling was perfect . </p><p> Another odd thing about this Rapide was that it had odd snapping sound like the rear chain was jumping teeth . The sprockets and chain looked good , why the sound ? Tricky one this . </p><p> Pushing and pulling on the rear frame section revealed that the swing arm pivot boss had noticable side play between the G 50 plate and the left side plate FT 5 . Could that be it ? The rear section was removed and the bearings serviced , shimmed up snug and the end nuts E 80 were carefully shimmed beneath to be a boot </p><p></p><p>kick fit between the plates . Reassembled she rode and handled beautifully and the sound was gone . Quite like a new bike in all </p><p>aspects . More to follow focusing on the rear spring boxes and springs . These greatly enfluence handling would you believe ? </p><p> Sid .</p></blockquote><p></p>
[QUOTE="Big Sid, post: 37144, member: 2781"] I'll relate a few comments and cautions about the suspension peculiarities on our Vincents . These are actual situations I've come across affecting handling characteristics , even introducing dangerous possibilities . We had a nice looking C Rapide end up in being ours , it's owner fearful of it for reasons not understood . We soon learned it felt like it was going to throw the rider and itself down the road if the surface was rough . Weird and truly scary to ride . Turns out there was a poor choice of front damper and it's lower eye bolts causing the problem . also it had a funny snapping noise when power was rolled on , but first the handling quirk . When the front wheel was raised off the floor allowing the forks to fully extend it was observed that the front fender rear section actually came in contact with the mag cowl hard enough to stop the fork from swinging across the center position towards left or right . But why ? The fender and rear brace looked normal , what explained the contact ? To do this the fork had to be going further down and so rearwards , but why . I removed the front hyd. damper complete with the lower eye bolts FF 57 . The damper was a Koni , often found on Vincents and when compared with an original Vincent damper , both fully extended , it was seen that the Koni was longer . Then examining the eye bolts these were the later longer ones used on the D models with the Armstrong dampers . Could that be it ? you betcha ! Together they allowed the fork to extend further and so contact the cowl . Problem solved . I swapped out these parts with an original damper and the earlier eye bolts and handling was perfect . Another odd thing about this Rapide was that it had odd snapping sound like the rear chain was jumping teeth . The sprockets and chain looked good , why the sound ? Tricky one this . Pushing and pulling on the rear frame section revealed that the swing arm pivot boss had noticable side play between the G 50 plate and the left side plate FT 5 . Could that be it ? The rear section was removed and the bearings serviced , shimmed up snug and the end nuts E 80 were carefully shimmed beneath to be a boot kick fit between the plates . Reassembled she rode and handled beautifully and the sound was gone . Quite like a new bike in all aspects . More to follow focusing on the rear spring boxes and springs . These greatly enfluence handling would you believe ? Sid . [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Best input sought to update front and rear suspension ?
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