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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="hadronuk" data-source="post: 42144" data-attributes="member: 1866"><p>My experience with my Rapide and other British bikes is that with everything else correct, the key to good starting is the tickover setting. The setting that gives the best tickover when hot is likely to be too lean for easy starting, so the setting is a compromise. Old Amals seem to be bad at supplying a combustible mixture at cranking speeds, so generous flooding helps, but if it doesn't start fairy quickly, there is of course a good chance of sooting the plug and making starting impossible.</p><p>I have also found that using new parts does not guarantee the correct fuel height. Note that the fore and aft position of the float chamber affects the fuel level, because the front carburettor has a slight updraught. The most forward position gives the highest fuel level for the front carburettor. (The rear cylinder of a twin is the opposite; due to the rear carburettor having about 5 degrees downdraft, so the most forward float chamber position gives the lowest fuel level). I eventually made a modified banjo bolt with a small brass stub soldered in so I could attach a clear plastic pipe and observe the fuel level directly.</p></blockquote><p></p>
[QUOTE="hadronuk, post: 42144, member: 1866"] My experience with my Rapide and other British bikes is that with everything else correct, the key to good starting is the tickover setting. The setting that gives the best tickover when hot is likely to be too lean for easy starting, so the setting is a compromise. Old Amals seem to be bad at supplying a combustible mixture at cranking speeds, so generous flooding helps, but if it doesn't start fairy quickly, there is of course a good chance of sooting the plug and making starting impossible. I have also found that using new parts does not guarantee the correct fuel height. Note that the fore and aft position of the float chamber affects the fuel level, because the front carburettor has a slight updraught. The most forward position gives the highest fuel level for the front carburettor. (The rear cylinder of a twin is the opposite; due to the rear carburettor having about 5 degrees downdraft, so the most forward float chamber position gives the lowest fuel level). I eventually made a modified banjo bolt with a small brass stub soldered in so I could attach a clear plastic pipe and observe the fuel level directly. [/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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