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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="timetraveller" data-source="post: 103360" data-attributes="member: 456"><p>Chris, the chap in Italy is using a Vincent damper. I doubt that will be too stiff and he has tried it without the damper. I have now heard from the chap in Italy as to his progress. Here is what he has written;</p><p></p><p><em>I have several old Ducatis and while hunting around for a spare part the other day I came across a pair of fork springs that looked vaguely similar to the Vincent ones. Presumably from a Marzocchi, they have an od of 1 inch and are made of 4mm steel just like your springs. The gap between coils is a bit smaller and decreases a little half way down, so they are definitely softer than the 30lb/inch springs, and about 10 cms longer. Anyway, I decide to try cutting one down bit by bit, starting at the 'soft' end, and when that showed interesting results, I started on the other one from the 'hard' end. So, to cut a long story short (!), I ended up with a 40cm spring on one side and a 43cm spring on the other, producing a more or less horizontal lower link when I sit on the bike, no topping out (with the long lower eyebolts now fitted) and a spring rate that feels pretty good. It's certainly softer than with the two full length 30lb/inch springs fitted or with the one shortened one, but with no danger of bottoming out. On the other hand, the springing is a bit more than the Vincent damper can cope with, so for now I've fitted my Armstrong, which has better rebound damping. </em></p><p></p><p>You will see that he is starting off with multi rates springs so that is not useful for the rest of us. I have considered multi rate springs for the JE mod but am not sure the company making my springs can do that.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 103360, member: 456"] Chris, the chap in Italy is using a Vincent damper. I doubt that will be too stiff and he has tried it without the damper. I have now heard from the chap in Italy as to his progress. Here is what he has written; [I]I have several old Ducatis and while hunting around for a spare part the other day I came across a pair of fork springs that looked vaguely similar to the Vincent ones. Presumably from a Marzocchi, they have an od of 1 inch and are made of 4mm steel just like your springs. The gap between coils is a bit smaller and decreases a little half way down, so they are definitely softer than the 30lb/inch springs, and about 10 cms longer. Anyway, I decide to try cutting one down bit by bit, starting at the 'soft' end, and when that showed interesting results, I started on the other one from the 'hard' end. So, to cut a long story short (!), I ended up with a 40cm spring on one side and a 43cm spring on the other, producing a more or less horizontal lower link when I sit on the bike, no topping out (with the long lower eyebolts now fitted) and a spring rate that feels pretty good. It's certainly softer than with the two full length 30lb/inch springs fitted or with the one shortened one, but with no danger of bottoming out. On the other hand, the springing is a bit more than the Vincent damper can cope with, so for now I've fitted my Armstrong, which has better rebound damping. [/I] You will see that he is starting off with multi rates springs so that is not useful for the rest of us. I have considered multi rate springs for the JE mod but am not sure the company making my springs can do that. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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