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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin gears.
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<blockquote data-quote="timetraveller" data-source="post: 24954" data-attributes="member: 456"><p>This thread seems to be turning into a critque on the quality of Vincent Spares. In the next MPH, Kent and Sussex Section Review, you will find details about the failure of parts with two of our members. The first had a valve seat fall out of a head that was less than one year and 5,000 miles old. The second fitted new lower guides and valves and then found that one of the new valves was seriously loose in one of the new guides. Several years ago I was given the oportunity to quote for the provision of new spare parts. (Please note that I do not make these parts but source them from machinist of known accuracy). As these are manufactured to Club owned drawing, and the Spares Company guards its privacy carefully, I cannot provide full details but one of the items was H13 which goes behind the brake arms and the gear change lever on twins. I was sent down a sample to show the machinist. The tolerances on the square hole in the middle of this item are quite tight at plus nothing, minus half a thou. The sample was 3 thou overized in one direction and 5 thou oversized in the other. With modern machine tools there is no excuse for such slackness or for valve seats falling out and it looks as though we need to start and chase up the quality control system.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 24954, member: 456"] This thread seems to be turning into a critque on the quality of Vincent Spares. In the next MPH, Kent and Sussex Section Review, you will find details about the failure of parts with two of our members. The first had a valve seat fall out of a head that was less than one year and 5,000 miles old. The second fitted new lower guides and valves and then found that one of the new valves was seriously loose in one of the new guides. Several years ago I was given the oportunity to quote for the provision of new spare parts. (Please note that I do not make these parts but source them from machinist of known accuracy). As these are manufactured to Club owned drawing, and the Spares Company guards its privacy carefully, I cannot provide full details but one of the items was H13 which goes behind the brake arms and the gear change lever on twins. I was sent down a sample to show the machinist. The tolerances on the square hole in the middle of this item are quite tight at plus nothing, minus half a thou. The sample was 3 thou overized in one direction and 5 thou oversized in the other. With modern machine tools there is no excuse for such slackness or for valve seats falling out and it looks as though we need to start and chase up the quality control system. [/QUOTE]
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Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin gears.
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