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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fogging for Mosquitos; Valve Guide Issues and Solutions
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<blockquote data-quote="timetraveller" data-source="post: 111568" data-attributes="member: 456"><p>It seems that this fault is occurring more frequently as the bikes get older. Some of you will be aware that when Chris Tilley had this problem I was able to provide him with a drawing of a way to get round this and prevent it happening. Chris managed to get a local machinist to make the parts. I got a price for making ten of these and it worked out at £45 each. These would be CNCd and there is a lot of setting up time which means that it is expensive to make small numbers. I am contemplating getting twenty made this autumn which would have a recess for the oil seal built in. As far as I can tell I can get away with one size which would work with both inlet and exhaust valves. If the valve guide has also been destroyed than a new one of those would also be required but the proposed gadgets will work even if the thread had gone. They would be made of 7075 aluminium alloy which has similar strength to mild steel. If I have to fund all this myself then I will get ten only made as I don't want hundreds of pounds sitting on the shelf for years. It seems to me that a case could be made for several sections or repairers holding some of these in order to do rapid repairs. If anyone out there is prepared to hold a few of these to help out local riders then please contact me at <a href="mailto:enw07@btinternet.com">enw07@btinternet.com</a>. The more that are made in one batch then the cheaper they will be.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 111568, member: 456"] It seems that this fault is occurring more frequently as the bikes get older. Some of you will be aware that when Chris Tilley had this problem I was able to provide him with a drawing of a way to get round this and prevent it happening. Chris managed to get a local machinist to make the parts. I got a price for making ten of these and it worked out at £45 each. These would be CNCd and there is a lot of setting up time which means that it is expensive to make small numbers. I am contemplating getting twenty made this autumn which would have a recess for the oil seal built in. As far as I can tell I can get away with one size which would work with both inlet and exhaust valves. If the valve guide has also been destroyed than a new one of those would also be required but the proposed gadgets will work even if the thread had gone. They would be made of 7075 aluminium alloy which has similar strength to mild steel. If I have to fund all this myself then I will get ten only made as I don't want hundreds of pounds sitting on the shelf for years. It seems to me that a case could be made for several sections or repairers holding some of these in order to do rapid repairs. If anyone out there is prepared to hold a few of these to help out local riders then please contact me at [email]enw07@btinternet.com[/email]. The more that are made in one batch then the cheaper they will be. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fogging for Mosquitos; Valve Guide Issues and Solutions
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