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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
More Brampton Woes
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<blockquote data-quote="Oldhaven" data-source="post: 118423" data-attributes="member: 2879"><p>My Bramptons on the '48 Rapide have obviously been up against the stem cross piece before and are dented there. I see one new chip in the dent area but when my brother repainted the forks long ago the dent was there then. Also in this picture you can see the white mark or chip where the steering stop is hitting above the rib, so there you have another data point for that discussion.</p><p></p><p>[ATTACH=full]33010[/ATTACH]</p><p></p><p>I have an 180 pound original spring on it now, but for most of its life since my rebuild it has had a Thornton (Works) spring over conversion, and it also has a Patzke taper bearing conversion to complicate both matters. The Thornton had a 1/2" internal stop added to limit its travel so that it just cleared the crosspiece on full extension, though it could get quite close. This leads me to believe that the standard spring was the culprit during an earlier life. The original spring is constrained at both ends and should limit travel but could extend enough to do this I suppose if the unsprung weight was rapidly accelerated from full compression to full extension during a jump or from a hard dip in the road. Both the Thornton and this spring are close to level when I am in the saddle.</p></blockquote><p></p>
[QUOTE="Oldhaven, post: 118423, member: 2879"] My Bramptons on the '48 Rapide have obviously been up against the stem cross piece before and are dented there. I see one new chip in the dent area but when my brother repainted the forks long ago the dent was there then. Also in this picture you can see the white mark or chip where the steering stop is hitting above the rib, so there you have another data point for that discussion. [ATTACH type="full" alt="IMG_1709.jpg"]33010[/ATTACH] I have an 180 pound original spring on it now, but for most of its life since my rebuild it has had a Thornton (Works) spring over conversion, and it also has a Patzke taper bearing conversion to complicate both matters. The Thornton had a 1/2" internal stop added to limit its travel so that it just cleared the crosspiece on full extension, though it could get quite close. This leads me to believe that the standard spring was the culprit during an earlier life. The original spring is constrained at both ends and should limit travel but could extend enough to do this I suppose if the unsprung weight was rapidly accelerated from full compression to full extension during a jump or from a hard dip in the road. Both the Thornton and this spring are close to level when I am in the saddle. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
More Brampton Woes
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