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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ATD Springs
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<blockquote data-quote="Ken Targett" data-source="post: 43369" data-attributes="member: 521"><p>Interesting points, Martyn. It's only recently that I've built a drive adapter for my rig so that I can drive a mag through its ATD, so I haven't got masses of test data to go on. But the Lucas ATD that I was testing last weekend didn't show any signs of hysteresis, i.e. the amount of advance/retard wasn't dependent on whether the speed was increasing or decreasing. By contrast, with a BTH ATD that I tested recently, there certainly was hysteresis of the type you'd associate with friction in the ATD. </p><p></p><p>I had exactly the same problem you've been talking about with my Venom a few years ago. To be honest, I don't (now) know what it was I did to it to fix it. But thinking about the possible causes you've mentioned of interference between the rear of the ATD and the oil seal, and friction with the cam ring, I'm not at all sure they can be the real cause. Both, it seems to me, would tend to retard the ignition rather than keep it advanced.</p><p></p><p>All a mystery.</p><p></p><p>Ken.</p></blockquote><p></p>
[QUOTE="Ken Targett, post: 43369, member: 521"] Interesting points, Martyn. It's only recently that I've built a drive adapter for my rig so that I can drive a mag through its ATD, so I haven't got masses of test data to go on. But the Lucas ATD that I was testing last weekend didn't show any signs of hysteresis, i.e. the amount of advance/retard wasn't dependent on whether the speed was increasing or decreasing. By contrast, with a BTH ATD that I tested recently, there certainly was hysteresis of the type you'd associate with friction in the ATD. I had exactly the same problem you've been talking about with my Venom a few years ago. To be honest, I don't (now) know what it was I did to it to fix it. But thinking about the possible causes you've mentioned of interference between the rear of the ATD and the oil seal, and friction with the cam ring, I'm not at all sure they can be the real cause. Both, it seems to me, would tend to retard the ignition rather than keep it advanced. All a mystery. Ken. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ATD Springs
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