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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brampton Coil-Over Damper
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<blockquote data-quote="Robert Watson" data-source="post: 110807" data-attributes="member: 38"><p>When I first started playing with the Thornton's for the Brampton's one of the things they stressed to me was that the mounts had to be free to rotate, which only makes sense and all the kits I did had bushings clamped so that the mounts could rotate. One person, said he was quite capable of making his own and just bought the shock only. A month or two later he phoned up raging that I had sold him a piece of *%& and blah blah blah. Result was exactly as you describe. I went to visit him and pointed out the the lower mount was, against my specific instructions, clamped solid. Although the up and down travel appears to be almost in a line parallel to the shaft it is not. I chastised him severely for a self inflicted problem. We repaired the problem by drilling and tapping the rod and loctiting a stud in the end. My idiot brother sold that bike to a friend of mine some years later and it is still working just fine. I have run one on my black B for around 20K miles plus, most with 2 up and luggage and have had no issues. </p><p></p><p>As a note on the lower mount as well, when they refused to make me any more 15 or 20 years ago "on the advice of the lawyers" they said it was the lower mount that was in question. I measured several sets of Bramptons at the lower lug and calculated the shear strength based on the lowest grade of casting material and it turned out to be slightly stronger than the 5/16" bolt in double shear that was holding it in there!</p></blockquote><p></p>
[QUOTE="Robert Watson, post: 110807, member: 38"] When I first started playing with the Thornton's for the Brampton's one of the things they stressed to me was that the mounts had to be free to rotate, which only makes sense and all the kits I did had bushings clamped so that the mounts could rotate. One person, said he was quite capable of making his own and just bought the shock only. A month or two later he phoned up raging that I had sold him a piece of *%& and blah blah blah. Result was exactly as you describe. I went to visit him and pointed out the the lower mount was, against my specific instructions, clamped solid. Although the up and down travel appears to be almost in a line parallel to the shaft it is not. I chastised him severely for a self inflicted problem. We repaired the problem by drilling and tapping the rod and loctiting a stud in the end. My idiot brother sold that bike to a friend of mine some years later and it is still working just fine. I have run one on my black B for around 20K miles plus, most with 2 up and luggage and have had no issues. As a note on the lower mount as well, when they refused to make me any more 15 or 20 years ago "on the advice of the lawyers" they said it was the lower mount that was in question. I measured several sets of Bramptons at the lower lug and calculated the shear strength based on the lowest grade of casting material and it turned out to be slightly stronger than the 5/16" bolt in double shear that was holding it in there! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Brampton Coil-Over Damper
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