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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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<blockquote data-quote="Oldhaven" data-source="post: 98723" data-attributes="member: 2879"><p>I guess it has been a while since I posted here, but some progress has been made with sorting out gearbox mounting and the lack of an F106. Since I will be mounting the seat as a cantilever and there will be no tubing connection to the RFM as in an Egli frame I had to come up with a good way to hold the rear of the UFM and engine together. Based on comments that the rake could be varied by using different distances for a F106 substitute, I decided to use adjustable linages with rod ends. Not too unlike the original Grey Flash arrangement with just bent tubing with flattened ends, and that seemed to work out fine. The center link is a LH/RH threaded arrangement for adjustability and the outside links will mount to the outside of the rear UFM mount. I also figured out one of the 10,000 ways to mount a Commando gearbox and went for an adjustable fixing even though I will be using a Newby belt drive. Those"dogbones" holding the adjusters are slotted to allow variation in bolt angles as adjustment is made. The F102 substitute is fairly conventional as these things go. The bolts, rods and plates are not in final form yet, but this is the general idea. It seems pretty solid with all tightened up.</p><p></p><p>[ATTACH=full]23433[/ATTACH][ATTACH=full]23434[/ATTACH][ATTACH=full]23435[/ATTACH][ATTACH=full]23436[/ATTACH]</p></blockquote><p></p>
[QUOTE="Oldhaven, post: 98723, member: 2879"] I guess it has been a while since I posted here, but some progress has been made with sorting out gearbox mounting and the lack of an F106. Since I will be mounting the seat as a cantilever and there will be no tubing connection to the RFM as in an Egli frame I had to come up with a good way to hold the rear of the UFM and engine together. Based on comments that the rake could be varied by using different distances for a F106 substitute, I decided to use adjustable linages with rod ends. Not too unlike the original Grey Flash arrangement with just bent tubing with flattened ends, and that seemed to work out fine. The center link is a LH/RH threaded arrangement for adjustability and the outside links will mount to the outside of the rear UFM mount. I also figured out one of the 10,000 ways to mount a Commando gearbox and went for an adjustable fixing even though I will be using a Newby belt drive. Those"dogbones" holding the adjusters are slotted to allow variation in bolt angles as adjustment is made. The F102 substitute is fairly conventional as these things go. The bolts, rods and plates are not in final form yet, but this is the general idea. It seems pretty solid with all tightened up. [ATTACH=full]23433[/ATTACH][ATTACH=full]23434[/ATTACH][ATTACH=full]23435[/ATTACH][ATTACH=full]23436[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Standard Comet Special
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