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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Request for advice - Rapide 276 Carburettors
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<blockquote data-quote="Len Matthews" data-source="post: 4507" data-attributes="member: 178"><p>Although not related to Stuart's on-going problem, I pondered for ages as to why the Mk2 Concentrics on my bike seemed very rich at small throttle openings. Getting a reasonable tickover was impossible. First thoughs centred around the cold start plungers. Were they seating correctly? They were, so that's not the reason. Pilot jets? Nothing wrong there. Slide cutaway? No, not that. One thing I had never done was unscrew the Main Jet holders from the Carb bodies so I took them out. As there is no sealing washer between the hexagon and the carb body and as the threads are quite coarse, it occured to me that fuel may be sucked up past these threads so I put the jet holders back in with PTFE tape and Lo! much improved low speed carburation!</p></blockquote><p></p>
[QUOTE="Len Matthews, post: 4507, member: 178"] Although not related to Stuart's on-going problem, I pondered for ages as to why the Mk2 Concentrics on my bike seemed very rich at small throttle openings. Getting a reasonable tickover was impossible. First thoughs centred around the cold start plungers. Were they seating correctly? They were, so that's not the reason. Pilot jets? Nothing wrong there. Slide cutaway? No, not that. One thing I had never done was unscrew the Main Jet holders from the Carb bodies so I took them out. As there is no sealing washer between the hexagon and the carb body and as the threads are quite coarse, it occured to me that fuel may be sucked up past these threads so I put the jet holders back in with PTFE tape and Lo! much improved low speed carburation! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Request for advice - Rapide 276 Carburettors
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