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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Poor starting on new Amal and BTH Magneto
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<blockquote data-quote="davidd" data-source="post: 42128" data-attributes="member: 1177"><p>It is so difficult to juggle so many things! You did not mention the heat range of the plug, but you might check to make sure it is hot enough just for getting the bike started. I would guess it is the carb. The lack of change with the choke is varied I think is your best clue. If you are setting it up according to the book it should start and idle. The cutaway, assuming it is stock, would not impact the start.</p><p></p><p>I use the twin plug BTH and I had difficulty on the initial start up. It turned out that the unit was not grounding reliably through the flange and studs. I attached an alligator clip as a ground and the problem went away. Because the spark is high frequency, you have to check the spark in a darkened shop. It does not show up very well. I am not familiar with the issue of the spark being delayed. </p><p></p><p>Nothing obvious springs to mind on the carb. You might send Greg Brillus a PM. Several months ago Greg mentioned that he was having trouble with the new 1-1/8" carbs, but none of the other new Amals. </p><p></p><p>I started my bike set at 34 degrees, but when I put it on the dyno to set the timing I ended up at 19 degrees. No starting issues either way, but I was using rollers. I ran two races with it at 34 degrees.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 42128, member: 1177"] It is so difficult to juggle so many things! You did not mention the heat range of the plug, but you might check to make sure it is hot enough just for getting the bike started. I would guess it is the carb. The lack of change with the choke is varied I think is your best clue. If you are setting it up according to the book it should start and idle. The cutaway, assuming it is stock, would not impact the start. I use the twin plug BTH and I had difficulty on the initial start up. It turned out that the unit was not grounding reliably through the flange and studs. I attached an alligator clip as a ground and the problem went away. Because the spark is high frequency, you have to check the spark in a darkened shop. It does not show up very well. I am not familiar with the issue of the spark being delayed. Nothing obvious springs to mind on the carb. You might send Greg Brillus a PM. Several months ago Greg mentioned that he was having trouble with the new 1-1/8" carbs, but none of the other new Amals. I started my bike set at 34 degrees, but when I put it on the dyno to set the timing I ended up at 19 degrees. No starting issues either way, but I was using rollers. I ran two races with it at 34 degrees. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Poor starting on new Amal and BTH Magneto
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