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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Inconsistent starting
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<blockquote data-quote="teunvandriel" data-source="post: 144685" data-attributes="member: 587"><p>Two months ago I had EXACTLY the same problem with my C Rapide with magneto ignition, Amal 276 carbs, same jets, pilot jets one and a half turns open, spark plug rear B7ES and front B6ES. The engine will only start with the air slides open!!!! As fuel we use here in Holland 100% ethanol-free Shell VPower RON 98 or BP Ultimate RON 98.</p><p>Last spring, the engine started to have more and more trouble starting. Especially on the road when the engine was warm. Started with blowing through the jet and the carbs with the compressor which did not help. The carbs also leaked a lot after the floatation. Then I checked the ignition and adjusted it to exactly 35 degrees. But the starting problem was NOT solved. Last year I bought a new camring which I had to correct to exactly 50 degrees with a Dremel (there was a deviation). Then Peter Volkers lent me one of his new magnetos and mounted it on my bike. But the starting problem was NOT solved, so I mounted my own magneto again. Then I disassembled the carbs and took them to a Dutch Section colleague who owns an ULTRASONIC CLEANER. The loose carb houses and <strong>LOOSE</strong> JET BLOCS bubbled in the cleaner for half an hour. Reassembled the carbs, adjusted the pilot jet one and a half turns, used the backside of a 1/4" drill that I use as a calibre to adjust both throttle slides (a trick that I also recently read about on this forum), and synchronised the throttle slides.</p><p>The Rapide started at the first kick, and also the carbs didn't leak anymore. Sometimes the engine doesn't start at once, but that's my own fault (didn't pedal hard enough), then I let both carbs run over for a while and I start with the throttle fully open whereby the engine always starts immediately (of course close the throttle immediately). </p><p>Problem was the jet blocs which were almost certainly dirty.</p><p>I also painted the carbs (that was also the subject of this forum) with MOTIP Wheelspray nr 4010 which still looks perfect after 3 months, exactly the right colour, cost of the paint, 10 Euros.</p></blockquote><p></p>
[QUOTE="teunvandriel, post: 144685, member: 587"] Two months ago I had EXACTLY the same problem with my C Rapide with magneto ignition, Amal 276 carbs, same jets, pilot jets one and a half turns open, spark plug rear B7ES and front B6ES. The engine will only start with the air slides open!!!! As fuel we use here in Holland 100% ethanol-free Shell VPower RON 98 or BP Ultimate RON 98. Last spring, the engine started to have more and more trouble starting. Especially on the road when the engine was warm. Started with blowing through the jet and the carbs with the compressor which did not help. The carbs also leaked a lot after the floatation. Then I checked the ignition and adjusted it to exactly 35 degrees. But the starting problem was NOT solved. Last year I bought a new camring which I had to correct to exactly 50 degrees with a Dremel (there was a deviation). Then Peter Volkers lent me one of his new magnetos and mounted it on my bike. But the starting problem was NOT solved, so I mounted my own magneto again. Then I disassembled the carbs and took them to a Dutch Section colleague who owns an ULTRASONIC CLEANER. The loose carb houses and [B]LOOSE[/B] JET BLOCS bubbled in the cleaner for half an hour. Reassembled the carbs, adjusted the pilot jet one and a half turns, used the backside of a 1/4" drill that I use as a calibre to adjust both throttle slides (a trick that I also recently read about on this forum), and synchronised the throttle slides. The Rapide started at the first kick, and also the carbs didn't leak anymore. Sometimes the engine doesn't start at once, but that's my own fault (didn't pedal hard enough), then I let both carbs run over for a while and I start with the throttle fully open whereby the engine always starts immediately (of course close the throttle immediately). Problem was the jet blocs which were almost certainly dirty. I also painted the carbs (that was also the subject of this forum) with MOTIP Wheelspray nr 4010 which still looks perfect after 3 months, exactly the right colour, cost of the paint, 10 Euros. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Inconsistent starting
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