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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Suspension and Handling Upgrades
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<blockquote data-quote="timetraveller" data-source="post: 161130" data-attributes="member: 456"><p>Please don't take my word for it. Just about every Vincent which is being raced at the moment with the standard front end has the JE stem, or in the USA, a similar design by Dave Dunfey. Greg Brillus in Australia has either sold or fitted between 50 and 60. The Tilleys from south Wales who are long distance riders find it a vast improvement and have posted a video of the new forks movement. Chris Launders from south Yorkshire has also been impressed by the handling and has posted his video of the fork movement. The chap who was racing Patrick Godet's Flash on the Isle of Man a few years ago had one on his bike and, if I remember correctly, was the fastest Vincent around the course ever. So much has been written about it on this forum that I could not expect any one to read all of it but when you are back at home and have spare hour or two it would be worth browsing. Try searching under 'modified steering heads. I have sold about 300 now and have another twenty on order for machining now. This is all for zero profit as I was so impressed by the system when I finally understood what John Emmanuel had designed, and having had a tank slapper at 100 mph many years ago while racing at Cadwell Park that it seemed to me that this was such an improvement to the safety of Vins that it was worth getting involved. I never thought that it would take so much time and that so many would be used. JE's design solves the handling as far as it can. The improvement to the comfort comes from my own design efforts and those of Hadranuk, on here, who persuaded AVO to do the development work on their dampers and Greg Brillus in Oz who came up with the idea of replacing the Oilite bushes in the eccentrics with ball races on the replacement concentrics.</p><p></p><p></p><p>As for the length of the spring boxes, the question by highbury731; the problem here is that not all spring boxes are the same. No surprise there then. In particular the part at the top of the outer can be noticeably different from bike to bike. I have measured an outer one which I believe is unmodified from new and it is 12.25" from the bolt centre to the bottom of the tube. I recommend cutting off three quarters of an inch to a full inch off both the inner and outer tubes. There is a way to check but it is tedious. Remove both front springs and then ensure that the inners will go all the way into the outers, replace the boxes. Leave the springs out. Move the forks from max high to max low and look at the distance between the bottom of the outer tube and the part of the blade forging to which the inner tube connects. If the tubes are too long then there will be a clash between the outer tube and the fork blade at that point. The total movement is controlled by the combined length of the damper and the lower eyebolts and it is important that the longer eyebolts are used with the AVO damper to ensure that the forks are in the correct part of their movement range. I would point out that Greg in Australia prefers to use stronger springs than most people over here find comfortable. He uses the 45 lbs/inch springs and a softer damper. I tried supplying those to people several years ago and when used with an AVO damper all the middle to lower weight riders found that combination too hard. I supply the 45 lbs/inch springs to all riders of twins over eighteen stones and one rider who is about 21 stones also packs the stronger springs with about half an inch of solid material. For Comets, lighter riders or even stripped down for racing Comets I supply springs from 30 lbs/inch and then 33 and 36 lbs/inch springs as the weight of the bike and rider increases.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 161130, member: 456"] Please don't take my word for it. Just about every Vincent which is being raced at the moment with the standard front end has the JE stem, or in the USA, a similar design by Dave Dunfey. Greg Brillus in Australia has either sold or fitted between 50 and 60. The Tilleys from south Wales who are long distance riders find it a vast improvement and have posted a video of the new forks movement. Chris Launders from south Yorkshire has also been impressed by the handling and has posted his video of the fork movement. The chap who was racing Patrick Godet's Flash on the Isle of Man a few years ago had one on his bike and, if I remember correctly, was the fastest Vincent around the course ever. So much has been written about it on this forum that I could not expect any one to read all of it but when you are back at home and have spare hour or two it would be worth browsing. Try searching under 'modified steering heads. I have sold about 300 now and have another twenty on order for machining now. This is all for zero profit as I was so impressed by the system when I finally understood what John Emmanuel had designed, and having had a tank slapper at 100 mph many years ago while racing at Cadwell Park that it seemed to me that this was such an improvement to the safety of Vins that it was worth getting involved. I never thought that it would take so much time and that so many would be used. JE's design solves the handling as far as it can. The improvement to the comfort comes from my own design efforts and those of Hadranuk, on here, who persuaded AVO to do the development work on their dampers and Greg Brillus in Oz who came up with the idea of replacing the Oilite bushes in the eccentrics with ball races on the replacement concentrics. As for the length of the spring boxes, the question by highbury731; the problem here is that not all spring boxes are the same. No surprise there then. In particular the part at the top of the outer can be noticeably different from bike to bike. I have measured an outer one which I believe is unmodified from new and it is 12.25" from the bolt centre to the bottom of the tube. I recommend cutting off three quarters of an inch to a full inch off both the inner and outer tubes. There is a way to check but it is tedious. Remove both front springs and then ensure that the inners will go all the way into the outers, replace the boxes. Leave the springs out. Move the forks from max high to max low and look at the distance between the bottom of the outer tube and the part of the blade forging to which the inner tube connects. If the tubes are too long then there will be a clash between the outer tube and the fork blade at that point. The total movement is controlled by the combined length of the damper and the lower eyebolts and it is important that the longer eyebolts are used with the AVO damper to ensure that the forks are in the correct part of their movement range. I would point out that Greg in Australia prefers to use stronger springs than most people over here find comfortable. He uses the 45 lbs/inch springs and a softer damper. I tried supplying those to people several years ago and when used with an AVO damper all the middle to lower weight riders found that combination too hard. I supply the 45 lbs/inch springs to all riders of twins over eighteen stones and one rider who is about 21 stones also packs the stronger springs with about half an inch of solid material. For Comets, lighter riders or even stripped down for racing Comets I supply springs from 30 lbs/inch and then 33 and 36 lbs/inch springs as the weight of the bike and rider increases. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Suspension and Handling Upgrades
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