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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
229/289 Carb Set Up
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<blockquote data-quote="Rob H" data-source="post: 110176" data-attributes="member: 1913"><p>Just a quick post to update, took out both carb blocks and tried with a 0.5mm drill. One was a loose fit but the other was a bit tight. Don't think this was an issue of being too small but more gummed up as I was able to open it up by just twisting the drill between two fingers.</p><p></p><p>The other issue that was spotted was that the air screw on the carb was further out than the other. this was due to the air screw becoming tight when screwed in well before the actual stop point and thus gave a false setting (not wishing to force it). Both screws were closed fully to the stop and opened 1 turn. Needles raised one notch.</p><p></p><p>The result is - success - the bike now runs and ticks over with no hesitation on pick up. I think it is probably a bit rich so will just lean it off a little at a time and try it.</p><p></p><p>Thanks all for the help & advice. I am assuming the fuel gummed up the pilot jet a little which in conjunction with the air screw setting which I assume was also gummed up making it tight would explain why it had worked fine in the past.</p><p></p><p>bloody modern petrol or so they call it!</p></blockquote><p></p>
[QUOTE="Rob H, post: 110176, member: 1913"] Just a quick post to update, took out both carb blocks and tried with a 0.5mm drill. One was a loose fit but the other was a bit tight. Don't think this was an issue of being too small but more gummed up as I was able to open it up by just twisting the drill between two fingers. The other issue that was spotted was that the air screw on the carb was further out than the other. this was due to the air screw becoming tight when screwed in well before the actual stop point and thus gave a false setting (not wishing to force it). Both screws were closed fully to the stop and opened 1 turn. Needles raised one notch. The result is - success - the bike now runs and ticks over with no hesitation on pick up. I think it is probably a bit rich so will just lean it off a little at a time and try it. Thanks all for the help & advice. I am assuming the fuel gummed up the pilot jet a little which in conjunction with the air screw setting which I assume was also gummed up making it tight would explain why it had worked fine in the past. bloody modern petrol or so they call it! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
229/289 Carb Set Up
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