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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series 'A' Steering-Head Bearings
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<blockquote data-quote="Dinny" data-source="post: 116884" data-attributes="member: 2178"><p>Hi Peter,</p><p></p><p>The original A cups were missing on mine. I got the later setup from Steve Hamel here in the US and tried to measure if everything would fit height wise and in the end gave up as every measurement was different.</p><p></p><p>I found someone who could grind them and did the following mods.</p><p></p><p>The top yoke bearing housing was machined to a good press fit for the top cone, the same was done for the bottom cone onto the bottom yoke. I don’t remember the exact clearance but I think it was around 1.5 or 2 thou. They were still tight when fitted using heat and the freezer and will not be going anywhere.</p><p></p><p>I then fitted the cups into the frame, after cleaning up the frame I had a nice tight fit without any mods.</p><p></p><p>When assembled I only had about 3 threads on the top nut. The upper and lower bearings as mounted are shown below which was not good and the outside faces of the cups were proud of the frame. I then calculated that if I ground off 40 thou from the rear faces of the cups that would allow everything to seat correctly without the balls showing and large gaps. This also gave me enough threads on the top nut and the cones fitted nicely just below the surface of the frame. There is plenty of material on the cones on the post war setup.</p><p></p><p>I hope this helps and it all works fine.</p><p></p><p>Cheers</p><p>Mark</p></blockquote><p></p>
[QUOTE="Dinny, post: 116884, member: 2178"] Hi Peter, The original A cups were missing on mine. I got the later setup from Steve Hamel here in the US and tried to measure if everything would fit height wise and in the end gave up as every measurement was different. I found someone who could grind them and did the following mods. The top yoke bearing housing was machined to a good press fit for the top cone, the same was done for the bottom cone onto the bottom yoke. I don’t remember the exact clearance but I think it was around 1.5 or 2 thou. They were still tight when fitted using heat and the freezer and will not be going anywhere. I then fitted the cups into the frame, after cleaning up the frame I had a nice tight fit without any mods. When assembled I only had about 3 threads on the top nut. The upper and lower bearings as mounted are shown below which was not good and the outside faces of the cups were proud of the frame. I then calculated that if I ground off 40 thou from the rear faces of the cups that would allow everything to seat correctly without the balls showing and large gaps. This also gave me enough threads on the top nut and the cones fitted nicely just below the surface of the frame. There is plenty of material on the cones on the post war setup. I hope this helps and it all works fine. Cheers Mark [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series 'A' Steering-Head Bearings
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