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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Hydraulic Steering Damper
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<blockquote data-quote="timetraveller" data-source="post: 99508" data-attributes="member: 456"><p>The damper bracket is supported by a specially made stainless steel bolt which has a 3/8 BSF thread on its upper part. This bolt has three different diameters as well as the hexagon to fit a BSF nut (i.e. you can use your existing spanners). This screws into the hole originally intended to take the anchor pin of the friction damper. The internal diameter of this is 5/16" which coincidentally is the right size for tapping out to 3/3 BSF. On my own bike, the ex-Cecil Mills road racer, this hole was already tapped 3/8 BSF but who did that, when or why I have no idea. All the others I have looked at are plain holes. I was aware of the need for some slop to prevent weaving, as described by Oldhaven, but this does not seem to be a problem. My guess is that the damper is meant to prevent rapid movements and as such is actually better than the original friction damper. Most people will be aware of 'sticktion' whereby a friction damper takes more force to start it moving than it exerts once it is moving. The hydraulic dampers move very easily at slow speeds and do not suffer from this problem.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 99508, member: 456"] The damper bracket is supported by a specially made stainless steel bolt which has a 3/8 BSF thread on its upper part. This bolt has three different diameters as well as the hexagon to fit a BSF nut (i.e. you can use your existing spanners). This screws into the hole originally intended to take the anchor pin of the friction damper. The internal diameter of this is 5/16" which coincidentally is the right size for tapping out to 3/3 BSF. On my own bike, the ex-Cecil Mills road racer, this hole was already tapped 3/8 BSF but who did that, when or why I have no idea. All the others I have looked at are plain holes. I was aware of the need for some slop to prevent weaving, as described by Oldhaven, but this does not seem to be a problem. My guess is that the damper is meant to prevent rapid movements and as such is actually better than the original friction damper. Most people will be aware of 'sticktion' whereby a friction damper takes more force to start it moving than it exerts once it is moving. The hydraulic dampers move very easily at slow speeds and do not suffer from this problem. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Hydraulic Steering Damper
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