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Engine Numbers, Frame Numbers and the DVLA
Series B RFM, where do I find one?!?
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<blockquote data-quote="davidd" data-source="post: 81076" data-attributes="member: 1177"><p>I suspect that the problem with the original FT/6 was not just the issue of tire clearance. This would have been a problem with 20" rear racing tires growing at speed, but it was probably not a serious production issue. The production problem was that the chain installed was a 104 pitch chain. When it was installed it could be too tight. A rat tail file could ease the problem. If you installed a 106 pitch chain it was too long and you could not sell a new Vincent with a chain that was at its limit, appearing to be worn out. (The FT6/1 uses the 106 pitch chain.) </p><p></p><p>I install the short RFM's on the road racers for the shorter wheelbase, but it is always a problem when I need to go to a 104 pitch chain for gearing reasons.</p><p></p><p>I cannot imagine that there were a lot of "C" RFM's with straight seat stays. It seems to beg the question: if the straight seat stays were too far aft on the longer RFM for proper seat geometry, how many were manufactured that way?</p><p></p><p>Also, you can get tricky with the rear damping if you do not want to cut the UFM. A damper in place of one spring box and a higher rate spring on the other side has been done successfully. For that matter, a coil over on one side and a lighter spring on the other would work. I would use any pieces that I could find and enjoy the ride.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 81076, member: 1177"] I suspect that the problem with the original FT/6 was not just the issue of tire clearance. This would have been a problem with 20" rear racing tires growing at speed, but it was probably not a serious production issue. The production problem was that the chain installed was a 104 pitch chain. When it was installed it could be too tight. A rat tail file could ease the problem. If you installed a 106 pitch chain it was too long and you could not sell a new Vincent with a chain that was at its limit, appearing to be worn out. (The FT6/1 uses the 106 pitch chain.) I install the short RFM's on the road racers for the shorter wheelbase, but it is always a problem when I need to go to a 104 pitch chain for gearing reasons. I cannot imagine that there were a lot of "C" RFM's with straight seat stays. It seems to beg the question: if the straight seat stays were too far aft on the longer RFM for proper seat geometry, how many were manufactured that way? Also, you can get tricky with the rear damping if you do not want to cut the UFM. A damper in place of one spring box and a higher rate spring on the other side has been done successfully. For that matter, a coil over on one side and a lighter spring on the other would work. I would use any pieces that I could find and enjoy the ride. David [/QUOTE]
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Engine Numbers, Frame Numbers and the DVLA
Series B RFM, where do I find one?!?
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