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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Seeking Ignition Suggestions For Twin - Can't Get The ATD Fitted
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<blockquote data-quote="Peter Holmes" data-source="post: 173939" data-attributes="member: 302"><p>If you have a surplus ATD with a good taper and Tufnol gear, but the mechanism itself is worn beyond acceptable limits, you could tack weld the central moving boss to the outer ears, and use the BT-H ignition device which has a built in advance curve, but you would still be reliant on a good taper fit, I am not sure that lapping with grinding paste is the best engineering solution, although I have done this myself, but you are only matching two components at the time of lapping, plus you are removing metal, and therefore moving the ATD gear inward a little the more you lap, not such a problem with the ATD taper, but maybe a problem down the line with the ignition device taper.</p><p></p><p>But having followed your trials and tribulations, I think the problem must lie with ignition timing slippage, nothing else makes any sense, if it were a cam turning on the camshaft, it would seem most unlikely that this could occur to both cams simultaneously, and a Vincent twin engine will start and run on one cylinder, although your right leg will know all about it. You seem to have ruled out all fuel problems.</p><p></p><p>Good Luck </p><p></p><p>Peter</p></blockquote><p></p>
[QUOTE="Peter Holmes, post: 173939, member: 302"] If you have a surplus ATD with a good taper and Tufnol gear, but the mechanism itself is worn beyond acceptable limits, you could tack weld the central moving boss to the outer ears, and use the BT-H ignition device which has a built in advance curve, but you would still be reliant on a good taper fit, I am not sure that lapping with grinding paste is the best engineering solution, although I have done this myself, but you are only matching two components at the time of lapping, plus you are removing metal, and therefore moving the ATD gear inward a little the more you lap, not such a problem with the ATD taper, but maybe a problem down the line with the ignition device taper. But having followed your trials and tribulations, I think the problem must lie with ignition timing slippage, nothing else makes any sense, if it were a cam turning on the camshaft, it would seem most unlikely that this could occur to both cams simultaneously, and a Vincent twin engine will start and run on one cylinder, although your right leg will know all about it. You seem to have ruled out all fuel problems. Good Luck Peter [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Seeking Ignition Suggestions For Twin - Can't Get The ATD Fitted
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