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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fitting ATD
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<blockquote data-quote="Robert Watson" data-source="post: 164874" data-attributes="member: 38"><p>That is a special nut in the ATD unit. It has the internal 3/8 BSF RH thread and an external LH thread. This is so that it will extract the ATD from the taper. I have had occasion where the nut would engage the RH magneto thread before releasing the LH ATD thread. You pull it all up tight and think all is well, but the nut has not pulled the taper tight. You need to make sure the LH thread is disengaged, set the timing as you have described and start the RH thread, and then put a socket over the nut and give it a good tap to set the ATD on the taper, and the tighten the nut fully home, using a good feel for a TIGHT fit. </p><p></p><p>Hope that helps.</p></blockquote><p></p>
[QUOTE="Robert Watson, post: 164874, member: 38"] That is a special nut in the ATD unit. It has the internal 3/8 BSF RH thread and an external LH thread. This is so that it will extract the ATD from the taper. I have had occasion where the nut would engage the RH magneto thread before releasing the LH ATD thread. You pull it all up tight and think all is well, but the nut has not pulled the taper tight. You need to make sure the LH thread is disengaged, set the timing as you have described and start the RH thread, and then put a socket over the nut and give it a good tap to set the ATD on the taper, and the tighten the nut fully home, using a good feel for a TIGHT fit. Hope that helps. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fitting ATD
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