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Tech. Advice: Series 'A' 500cc/1000cc Bikes
XBAPH parts
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<blockquote data-quote="chankly bore" data-source="post: 97132" data-attributes="member: 317"><p>The output sleeve bushes must be Oilite. The top-hat bushes for the layshaft must be Oilite. Some?? pre-war and early post-war boxes had no bushes for the free running first (34 teeth) and second (28 teeth) layshaft gears. All the original post-war Comet boxes I have examined had phosphor-bronze bushes for these gears. This material is O.K. in this position because these two bushes are lubricated by 1/8" cross-drillings in the two gears. Do check that the drillings are clear, though. They are often occluded with Cro-Magnon deposits of hardened lubricant. They are another reason to use modern semi-fluid lubricant rather than grease. A very good engineer once thought it smarter to make the top-hat bushes in bronze. They seized on the layshaft at 60 m.p.h. Very nasty. Fortunately gearbox and rider survived.</p></blockquote><p></p>
[QUOTE="chankly bore, post: 97132, member: 317"] The output sleeve bushes must be Oilite. The top-hat bushes for the layshaft must be Oilite. Some?? pre-war and early post-war boxes had no bushes for the free running first (34 teeth) and second (28 teeth) layshaft gears. All the original post-war Comet boxes I have examined had phosphor-bronze bushes for these gears. This material is O.K. in this position because these two bushes are lubricated by 1/8" cross-drillings in the two gears. Do check that the drillings are clear, though. They are often occluded with Cro-Magnon deposits of hardened lubricant. They are another reason to use modern semi-fluid lubricant rather than grease. A very good engineer once thought it smarter to make the top-hat bushes in bronze. They seized on the layshaft at 60 m.p.h. Very nasty. Fortunately gearbox and rider survived. [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
XBAPH parts
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