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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Starting Vincent Life with a Backfire!
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<blockquote data-quote="KennyNUT" data-source="post: 48421" data-attributes="member: 3057"><p>First things first. </p><p></p><p>Thanks to a local VOC member (Rob) calling me yesterday it spurred me onto today's activity together with davidd's words ringing my ears of "don't go throwing lots of new things at the Comet just yet! So I dismantled the float bowl and checked the float and needle on the Amal 289. Float was fine but the cone of the brass needle at the base was not mating with the brass inlet for the fuel were the double banjo bolt fits and so was not cutting off the fuel once the chamber was full. I cleaned it out and lapped it in with a bit of Brasso until the surfaces had gone from dull to shiny. Fitted it back together and no sloshing of fuel down the crankcases. So a better result.</p><p></p><p>However, the truly embarrassing part.............I cannot start the bike at all, now. Fuel is fine, the spark plugs are sparking. I even changed the plugs as 4 came with the bike. It so nearly catches but fails to. I have started supermoto singles before, so am completely flummoxed!</p><p></p><p>Before anyone thinks I have done anything else to the carb, I have not. Yesterday I also spent some considerable time pummelling my foot with the kick start. The bike would not start then either and that was before looking at the float bowl today. </p><p></p><p>I phoned the vendor today and went through the start procedure again.</p><p></p><p>1. Turn on left fuel tap.</p><p>2. Tickle the carb (2-3 seconds).</p><p>3. Choke 1/4 to1/2 on (same position when it started before (when it backfired back through the carb!).</p><p>4. Push on the kick start gently until TDC and use the valve lifter to ease that through and complete the kick start stroke gently. Return the kick start to its normal position.</p><p>5. Switch ignition on.</p><p>6. One good gentlemanly swing with the valve lifter raised until releasing it on the down stroke of the kick and...........................nothing. Occasionally, a dull burble, very occasionally a backfire (I put that down to too much choke or fuel between the cylinder and in the inlet tract. There is certainly not the same amount of fuel around when I first posted this thread, so I am a bit happier with that.</p><p></p><p>Repeat until exasperated!</p><p></p><p>Now all his time I have to thank my wife for not saying anything, even although she knows what I paid for this piece of motorcycling history. I also pulled back from asking her to push the bike to allow me to try and bump start it!</p><p></p><p>To the timing - There is a black box plastic tied into place between the two front prop stands. I have not attempted to remove that, though I presume it takes away the need for contact points. Are the settings on it adjustable?</p><p></p><p>I am determined not to give up this Beast, that clearly I do not yet know! But it is testing my patience somewhat!</p><p></p><p>Any other advice, truly welcome. </p><p></p><p>In fact you have all been so supportive, I joined up to the VOC.</p></blockquote><p></p>
[QUOTE="KennyNUT, post: 48421, member: 3057"] First things first. Thanks to a local VOC member (Rob) calling me yesterday it spurred me onto today's activity together with davidd's words ringing my ears of "don't go throwing lots of new things at the Comet just yet! So I dismantled the float bowl and checked the float and needle on the Amal 289. Float was fine but the cone of the brass needle at the base was not mating with the brass inlet for the fuel were the double banjo bolt fits and so was not cutting off the fuel once the chamber was full. I cleaned it out and lapped it in with a bit of Brasso until the surfaces had gone from dull to shiny. Fitted it back together and no sloshing of fuel down the crankcases. So a better result. However, the truly embarrassing part.............I cannot start the bike at all, now. Fuel is fine, the spark plugs are sparking. I even changed the plugs as 4 came with the bike. It so nearly catches but fails to. I have started supermoto singles before, so am completely flummoxed! Before anyone thinks I have done anything else to the carb, I have not. Yesterday I also spent some considerable time pummelling my foot with the kick start. The bike would not start then either and that was before looking at the float bowl today. I phoned the vendor today and went through the start procedure again. 1. Turn on left fuel tap. 2. Tickle the carb (2-3 seconds). 3. Choke 1/4 to1/2 on (same position when it started before (when it backfired back through the carb!). 4. Push on the kick start gently until TDC and use the valve lifter to ease that through and complete the kick start stroke gently. Return the kick start to its normal position. 5. Switch ignition on. 6. One good gentlemanly swing with the valve lifter raised until releasing it on the down stroke of the kick and...........................nothing. Occasionally, a dull burble, very occasionally a backfire (I put that down to too much choke or fuel between the cylinder and in the inlet tract. There is certainly not the same amount of fuel around when I first posted this thread, so I am a bit happier with that. Repeat until exasperated! Now all his time I have to thank my wife for not saying anything, even although she knows what I paid for this piece of motorcycling history. I also pulled back from asking her to push the bike to allow me to try and bump start it! To the timing - There is a black box plastic tied into place between the two front prop stands. I have not attempted to remove that, though I presume it takes away the need for contact points. Are the settings on it adjustable? I am determined not to give up this Beast, that clearly I do not yet know! But it is testing my patience somewhat! Any other advice, truly welcome. In fact you have all been so supportive, I joined up to the VOC. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Starting Vincent Life with a Backfire!
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