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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="timetraveller" data-source="post: 75738" data-attributes="member: 456"><p>It is certainly not necessary to use taper roller bearings. John Emmanuel who developed this mod does not believe they are required. However, if there is any reason to change the head bearings then the taper rollers are the way that I would go but depending upon who's design of taper roller installation one uses it might be necessary to machine the steering head to take the taper roller bearings. With regard to pneumatic action within the front spring boxes; I am just in the process of trying to find the correct combination of damper, eyebolt and spring box length to use with the softer springs and the modified steering heads so I have had to play about a lot over the last couple of days with the spring boxes. Not surprisingly I would suggest that not all spring boxes are created equal. The ones off my bike, the ex-Cecil Mills bike, can be pumped in and out as fast as one wants with no tendency to build up pressure. However, it is clear that some other people have found that this can happen so it pays to try it out first on your own set of spring boxes to decide whether you need to drill a hole or not. These tests, which will be written up more fully when they are complete, are concerned with the relative amounts of movement on the spring boxes, the new AVO damper and the wheel spindle. It should be noted that with the modified steering head the space between the upper and lower mounts for the spring boxes is now about one inch less than with the standard set up. To ensure that the bottom of the outer part of the spring box does not bottom out on the fork leg or that the top of the inner spring box does not clash with the inner top of the outer spring box I have cut off one inch of the top of the inner and off the bottom of the outer and then moved the fork legs over the full range allowed with the new damper and long eyebolts. It is clear that one inch is correct and note that as the total distance is now one inch less than original the shortened spring boxes do not stand out as short. More details will be available after a bit more work.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 75738, member: 456"] It is certainly not necessary to use taper roller bearings. John Emmanuel who developed this mod does not believe they are required. However, if there is any reason to change the head bearings then the taper rollers are the way that I would go but depending upon who's design of taper roller installation one uses it might be necessary to machine the steering head to take the taper roller bearings. With regard to pneumatic action within the front spring boxes; I am just in the process of trying to find the correct combination of damper, eyebolt and spring box length to use with the softer springs and the modified steering heads so I have had to play about a lot over the last couple of days with the spring boxes. Not surprisingly I would suggest that not all spring boxes are created equal. The ones off my bike, the ex-Cecil Mills bike, can be pumped in and out as fast as one wants with no tendency to build up pressure. However, it is clear that some other people have found that this can happen so it pays to try it out first on your own set of spring boxes to decide whether you need to drill a hole or not. These tests, which will be written up more fully when they are complete, are concerned with the relative amounts of movement on the spring boxes, the new AVO damper and the wheel spindle. It should be noted that with the modified steering head the space between the upper and lower mounts for the spring boxes is now about one inch less than with the standard set up. To ensure that the bottom of the outer part of the spring box does not bottom out on the fork leg or that the top of the inner spring box does not clash with the inner top of the outer spring box I have cut off one inch of the top of the inner and off the bottom of the outer and then moved the fork legs over the full range allowed with the new damper and long eyebolts. It is clear that one inch is correct and note that as the total distance is now one inch less than original the shortened spring boxes do not stand out as short. More details will be available after a bit more work. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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