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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Speedo calibration?
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<blockquote data-quote="b'knighted" data-source="post: 41079" data-attributes="member: 59"><p>I bought a damaged Honda VF750 Sabre 18" cast front wheel from my local wreckers. This was in the eighties so they were more common than they are now. The bearings had broken out of it but its disc mounting pads were perfect. I had access to a serious lathe and by removing the lump of bed from its gap was able to set the wheel up accurately on a four jaw chuck. My recollection is that it was within a few thou. of true. I cannot remember which was centre and which was face but the figures of 0.0040 and 0.0015 stick in my mind. I bored out the broken bearing housings and with a roughly cut disk of inch thick ally bolted on to the disc pads turned it true and bored it. A "top hat" was turned from 3" ally bar and with the plate removed was pressed through its bore so that the flange was sandwiched between the wheel and the plate once refitted.</p><p>This top hat was then bored concentric. Being daft I removed the wheel and did the same on the other side instead of just making a second plate and centre boss while the wheel was mounted. I lost the job and, access to the lathe but as I had also seized my big end at the time it became less important. When the time came for a rebuild some years later, my VOC mentor, Roger Clark finished the machining of the bolt on assemblies to take Vincent bearings and run on a Vincent hollow axle. The plate on the righthand side is machined the correct thickness to align a ¼ sprocket and Roger champhered the left plate to match the back of a Vincent drum which uses a steel brake plate tight to the inside of the RFM. This wheel has been in use for all of this century and has carried a variety of tubeless tyres. It is currently fitted with an Avon Distanzia as is the tubed 19" front wheel. With it hidden under the rear cowl it gets a bit neglected and has suffered a bit of salt corrosion. Ebay has recently provided me with a hardly used identical wheel which will fit between my plates when the bead no longer seals well enough to holds air. </p><p></p><p>Look closely at my avatar to see the lack of rear spokes.</p><p></p><p>I fancy tubeless tyres on my big Comet and have been looking at the big BMW trailie wheels that have straight spokes running from a wide land out board of the rim. The fronts have dual discs which should permit Vincent bearing carriers to be fitted but I'm not sure that the 18" or 19" are narrow enough to fit alongside the chain.</p><p></p><p>See <a href="http://www.ebay.co.uk/itm/BMW-R1200GS-ADVENTURE-Front-Wheel-Black-19-Genuine-R-1200-GS-36317710866-/230912797431?pt=UK_Motorcycle_Parts&hash=item35c379aaf7" target="_blank">http://www.ebay.co.uk/itm/BMW-R1200GS-ADVENTURE-Front-Wheel-Black-19-Genuine-R-1200-GS-36317710866-/230912797431?pt=UK_Motorcycle_Parts&hash=item35c379aaf7</a> for spoke style. A bit too expensive for me to chop up at the moment.</p></blockquote><p></p>
[QUOTE="b'knighted, post: 41079, member: 59"] I bought a damaged Honda VF750 Sabre 18" cast front wheel from my local wreckers. This was in the eighties so they were more common than they are now. The bearings had broken out of it but its disc mounting pads were perfect. I had access to a serious lathe and by removing the lump of bed from its gap was able to set the wheel up accurately on a four jaw chuck. My recollection is that it was within a few thou. of true. I cannot remember which was centre and which was face but the figures of 0.0040 and 0.0015 stick in my mind. I bored out the broken bearing housings and with a roughly cut disk of inch thick ally bolted on to the disc pads turned it true and bored it. A "top hat" was turned from 3" ally bar and with the plate removed was pressed through its bore so that the flange was sandwiched between the wheel and the plate once refitted. This top hat was then bored concentric. Being daft I removed the wheel and did the same on the other side instead of just making a second plate and centre boss while the wheel was mounted. I lost the job and, access to the lathe but as I had also seized my big end at the time it became less important. When the time came for a rebuild some years later, my VOC mentor, Roger Clark finished the machining of the bolt on assemblies to take Vincent bearings and run on a Vincent hollow axle. The plate on the righthand side is machined the correct thickness to align a ¼ sprocket and Roger champhered the left plate to match the back of a Vincent drum which uses a steel brake plate tight to the inside of the RFM. This wheel has been in use for all of this century and has carried a variety of tubeless tyres. It is currently fitted with an Avon Distanzia as is the tubed 19" front wheel. With it hidden under the rear cowl it gets a bit neglected and has suffered a bit of salt corrosion. Ebay has recently provided me with a hardly used identical wheel which will fit between my plates when the bead no longer seals well enough to holds air. Look closely at my avatar to see the lack of rear spokes. I fancy tubeless tyres on my big Comet and have been looking at the big BMW trailie wheels that have straight spokes running from a wide land out board of the rim. The fronts have dual discs which should permit Vincent bearing carriers to be fitted but I'm not sure that the 18" or 19" are narrow enough to fit alongside the chain. See [url]http://www.ebay.co.uk/itm/BMW-R1200GS-ADVENTURE-Front-Wheel-Black-19-Genuine-R-1200-GS-36317710866-/230912797431?pt=UK_Motorcycle_Parts&hash=item35c379aaf7[/url] for spoke style. A bit too expensive for me to chop up at the moment. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Speedo calibration?
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