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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Guides
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<blockquote data-quote="timetraveller" data-source="post: 104835" data-attributes="member: 456"><p>I'm a non machinist as well but if I were to have a go then you can use a lathe to turn the four different diameters and then use a mill with a rotary table to remove most of the largest diameter. Leave just enough to act as a locator in the groove in the cylinder head. Lacking a mill one could use a file but it would not be as neat. I particularly like the way that Chris has managed to incorporate the oil seal. Remember, for all those who have got a damaged cylinder head, you need to see just how much is left of the original thread and then design the final details. If I was to get a batch of these made then I would specify 7075 alloy which is supposedly as strong as mild steel. This mod totally stops any possibility of the lower guide going for a walk about and causing more damage.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 104835, member: 456"] I'm a non machinist as well but if I were to have a go then you can use a lathe to turn the four different diameters and then use a mill with a rotary table to remove most of the largest diameter. Leave just enough to act as a locator in the groove in the cylinder head. Lacking a mill one could use a file but it would not be as neat. I particularly like the way that Chris has managed to incorporate the oil seal. Remember, for all those who have got a damaged cylinder head, you need to see just how much is left of the original thread and then design the final details. If I was to get a batch of these made then I would specify 7075 alloy which is supposedly as strong as mild steel. This mod totally stops any possibility of the lower guide going for a walk about and causing more damage. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Guides
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