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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Points Ignition
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<blockquote data-quote="Pushrod Twin" data-source="post: 134323" data-attributes="member: 340"><p>I recently took a wild punt and liberated, out of Florida via Fleabay, the points ignition pictured. It is rather well made. However, I have a bunch of questions regarding it's origin and history.</p><p>For some reason there are fasteners missing, as was advertised. I pondered which side of the Atlantic it may have been made on so set about to identify the threads in the hope of working that out. Both the 3/16 threads which retain the drive gear, & the 5/16 threads in the adaptor were coarse, could be either BSW or UNC, however, the 2 holes for the missing screws intended to retain the points plate to the body are 3/16 BSF. Not necessarily 100% conclusive, but does lean towards being British. </p><p>Then the underside of the points plate clearly indicates the origin of that component at least. </p><p>Is this the points plate fitted to the Lucas twin points devices used on Norton & AMC twins in the 'late '60's? </p><p>The auto advance mechanism is small & tidy, but the shaft is way too long to be from the aforementioned AMC/Norton device and it all appears to be one piece. The shaft is ground and runs in Oilite bushes. No Git seal on the shaft,but a nicely made labyrinth which fits into the crankcase bore and mounts the drive gear. This clearly achieved the aim, there was no evidence of oil having flooded the shaft cavity, nor wear on the shaft or bushes. The external condition indicates that this device has has done some solid service. </p><p>Does anyone recognise it? Is it a one off, or did someone attempt to make a batch? </p><p>On a more technical note, what coils & condensers would Mr Lucas recommend to be matched with these points?</p></blockquote><p></p>
[QUOTE="Pushrod Twin, post: 134323, member: 340"] I recently took a wild punt and liberated, out of Florida via Fleabay, the points ignition pictured. It is rather well made. However, I have a bunch of questions regarding it's origin and history. For some reason there are fasteners missing, as was advertised. I pondered which side of the Atlantic it may have been made on so set about to identify the threads in the hope of working that out. Both the 3/16 threads which retain the drive gear, & the 5/16 threads in the adaptor were coarse, could be either BSW or UNC, however, the 2 holes for the missing screws intended to retain the points plate to the body are 3/16 BSF. Not necessarily 100% conclusive, but does lean towards being British. Then the underside of the points plate clearly indicates the origin of that component at least. Is this the points plate fitted to the Lucas twin points devices used on Norton & AMC twins in the 'late '60's? The auto advance mechanism is small & tidy, but the shaft is way too long to be from the aforementioned AMC/Norton device and it all appears to be one piece. The shaft is ground and runs in Oilite bushes. No Git seal on the shaft,but a nicely made labyrinth which fits into the crankcase bore and mounts the drive gear. This clearly achieved the aim, there was no evidence of oil having flooded the shaft cavity, nor wear on the shaft or bushes. The external condition indicates that this device has has done some solid service. Does anyone recognise it? Is it a one off, or did someone attempt to make a batch? On a more technical note, what coils & condensers would Mr Lucas recommend to be matched with these points? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Points Ignition
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