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Counter Steering: Does Anybody Have An Explanation? - Demystification Required
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<blockquote data-quote="oexing" data-source="post: 169104" data-attributes="member: 1493"><p>Converting the steering head for taper rollers was on my list certainly, so went for available bearings for classic BMWs. These have 51 mm o.d. , just half a millimeter more than 2" standard, so super. Inner dia. is 34 mm , so easy to have a bush on the stem loctited. Total height is 12 mm, so acceptable. Critical matter is to get bearing seats in head lug concentric and parallel. When looking at a company for this job you better ask all details as to how they want to achieve this perfectly. </p><p> I had my Hunger manual valve seat recess boring head with vertical plus horizontal feeds on a double pilot for getting sizes right. I wonder how any company will go along for the same job. </p><p> As to low speed wallowing or shimmy as this is called: I do not believe in flawed bearings to cause this effect. Critical thing is often some weight at the rear end on soft luggage carriers that will effect the front end a lot for the low speed shimmy at speeds around 60 - 90 kph only. I had this shimmy long time ago with the Earles BMW when I came back from Munich with two new bench grinders, one at rear of dual seat and one on the luggage carrier. So this load was far from rigid on the bike. As soon as I went faster than 60 kph I got a massive wallow in the fork from this, hydraulic standard steering damper too weak to fight it. So with courage and concentration I accelerated to over 100 kph and it was allright again for the trip home 30 km . </p><p> A motorbike is a very dynamic contraption, not easily understood and fixed in case of troubles. Different speed ranges have different roots of the problem. A lot is down to tires on particular bikes and these got the job to do when road behaviour is less than desirable in times. </p><p></p><p> Vic</p><p><a href="https://www.ebay.de/itm/352125273363?fits=DEM_Make%3ABMW&epid=7006211893&hash=item51fc4d4513:g:z~QAAOSwqANiEOOU&amdata=enc%3AAQAHAAAAoGgY3at6mkmJgYLdNwnWCuXUpcxR4eKtRUUlgPeLtPmovVAMwN60q%2BrDMtSEGNaATeKPrKGmtEKx050sWF7cooKwq2bZXiEY83wPVpLOGDH4C3iOxDJk%2FasG2vk9Fw8WAijSl9YLYbkPufFgYTCPuaTMVUEY6afCAHC7zSnPAGFH0aTjp%2FS5AK35jEH%2FWe%2FxHg9kTHhsfVrrwSWMMbMvYJc%3D%7Ctkp%3ABk9SR_SPhZPGYQ" target="_blank">BMW taper roller 34/51/12 mm</a></p><p></p><p>[ATTACH=full]56304[/ATTACH]</p><p></p><p>[ATTACH=full]56305[/ATTACH]</p><p></p><p>[ATTACH=full]56306[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 169104, member: 1493"] Converting the steering head for taper rollers was on my list certainly, so went for available bearings for classic BMWs. These have 51 mm o.d. , just half a millimeter more than 2" standard, so super. Inner dia. is 34 mm , so easy to have a bush on the stem loctited. Total height is 12 mm, so acceptable. Critical matter is to get bearing seats in head lug concentric and parallel. When looking at a company for this job you better ask all details as to how they want to achieve this perfectly. I had my Hunger manual valve seat recess boring head with vertical plus horizontal feeds on a double pilot for getting sizes right. I wonder how any company will go along for the same job. As to low speed wallowing or shimmy as this is called: I do not believe in flawed bearings to cause this effect. Critical thing is often some weight at the rear end on soft luggage carriers that will effect the front end a lot for the low speed shimmy at speeds around 60 - 90 kph only. I had this shimmy long time ago with the Earles BMW when I came back from Munich with two new bench grinders, one at rear of dual seat and one on the luggage carrier. So this load was far from rigid on the bike. As soon as I went faster than 60 kph I got a massive wallow in the fork from this, hydraulic standard steering damper too weak to fight it. So with courage and concentration I accelerated to over 100 kph and it was allright again for the trip home 30 km . A motorbike is a very dynamic contraption, not easily understood and fixed in case of troubles. Different speed ranges have different roots of the problem. A lot is down to tires on particular bikes and these got the job to do when road behaviour is less than desirable in times. Vic [URL='https://www.ebay.de/itm/352125273363?fits=DEM_Make%3ABMW&epid=7006211893&hash=item51fc4d4513:g:z~QAAOSwqANiEOOU&amdata=enc%3AAQAHAAAAoGgY3at6mkmJgYLdNwnWCuXUpcxR4eKtRUUlgPeLtPmovVAMwN60q%2BrDMtSEGNaATeKPrKGmtEKx050sWF7cooKwq2bZXiEY83wPVpLOGDH4C3iOxDJk%2FasG2vk9Fw8WAijSl9YLYbkPufFgYTCPuaTMVUEY6afCAHC7zSnPAGFH0aTjp%2FS5AK35jEH%2FWe%2FxHg9kTHhsfVrrwSWMMbMvYJc%3D%7Ctkp%3ABk9SR_SPhZPGYQ']BMW taper roller 34/51/12 mm[/URL] [ATTACH type="full"]56304[/ATTACH] [ATTACH type="full"]56305[/ATTACH] [ATTACH type="full"]56306[/ATTACH] [/QUOTE]
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Counter Steering: Does Anybody Have An Explanation? - Demystification Required
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