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Counter Steering: Does Anybody Have An Explanation? - Demystification Required
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<blockquote data-quote="oexing" data-source="post: 169160" data-attributes="member: 1493"><p>Norman, I had the standard forks in mind for mods and taper roller types. So with these I believe the BMW replacement is not to beat at 34-51-12 mm . I would never want more than 51 mm in the head casting for fear of cracks there. So alternatively there are bearings with 50 mm o.d., problem is the very thin adapter from 50.5 to 50 mm - not great. So next size is 48mm , allright for adapters but not stronger than the BMW size. But you don´t need to machine the head casting. Anyway, you have to keep 12 mm depth due to recesses in head lug. I do not know if bearings with 14 mm height would work out with your parts. So see my links below , scroll down for getting sizes and motorcycle types for ordering samples. Some sets may be useful when just having one bearing for the mod and bin the other, cheap enough.</p><p></p><p> Vic</p><p><a href="https://www.ebay.de/itm/164269770677" target="_blank">Yamaha bearing</a></p><p></p><p><a href="https://www.ebay.de/itm/233899576848" target="_blank">Yamaha No 2</a></p><p></p><p><a href="https://www.ebay.de/itm/233181585246" target="_blank">Honda</a></p><p></p><p>A great thing with the BMW type is the 34 mm i.d. and adapters loctited on the standard stem - which is typically a banana shape and bushes not perpendicular to stem. So you get the press for rectifying the plane of link bushes to be perpendicular and checking by having the stem on the lathe between machined centers. After you are happy about that matter you can loctite premachined adapters for upper and lower taper bearing on the stem and turn them to minimum press fit below and light slide fit of upper adapter, 34 mm here. Another matter on Bramptons is the fit of top yoke which has the pinch bolt for tightening the lot onto the stem. This yoke will possibly need a boring head job and sleeving for restored snug fit again.</p><p> Having races from different types of taper roller bearings does not work mostly as taper degrees are different, depending on cross sections of races and load requirements.</p><p></p><p> Vic</p><p>[ATTACH=full]56326[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 169160, member: 1493"] Norman, I had the standard forks in mind for mods and taper roller types. So with these I believe the BMW replacement is not to beat at 34-51-12 mm . I would never want more than 51 mm in the head casting for fear of cracks there. So alternatively there are bearings with 50 mm o.d., problem is the very thin adapter from 50.5 to 50 mm - not great. So next size is 48mm , allright for adapters but not stronger than the BMW size. But you don´t need to machine the head casting. Anyway, you have to keep 12 mm depth due to recesses in head lug. I do not know if bearings with 14 mm height would work out with your parts. So see my links below , scroll down for getting sizes and motorcycle types for ordering samples. Some sets may be useful when just having one bearing for the mod and bin the other, cheap enough. Vic [URL='https://www.ebay.de/itm/164269770677']Yamaha bearing[/URL] [URL='https://www.ebay.de/itm/233899576848']Yamaha No 2[/URL] [URL='https://www.ebay.de/itm/233181585246']Honda[/URL] A great thing with the BMW type is the 34 mm i.d. and adapters loctited on the standard stem - which is typically a banana shape and bushes not perpendicular to stem. So you get the press for rectifying the plane of link bushes to be perpendicular and checking by having the stem on the lathe between machined centers. After you are happy about that matter you can loctite premachined adapters for upper and lower taper bearing on the stem and turn them to minimum press fit below and light slide fit of upper adapter, 34 mm here. Another matter on Bramptons is the fit of top yoke which has the pinch bolt for tightening the lot onto the stem. This yoke will possibly need a boring head job and sleeving for restored snug fit again. Having races from different types of taper roller bearings does not work mostly as taper degrees are different, depending on cross sections of races and load requirements. Vic [ATTACH type="full" alt="P1080807.JPG"]56326[/ATTACH] [/QUOTE]
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Counter Steering: Does Anybody Have An Explanation? - Demystification Required
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