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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Mechanical rev counter drive
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<blockquote data-quote="manxnortonman" data-source="post: 4191" data-attributes="member: 929"><p><strong>Rev counter drive</strong></p><p></p><p></p><p>Trevor,</p><p> It can be done as I have fitted a 5" rev counter to my rapide which has an auto adv/retard mechanism. I assume you have the normal angle drive on your timining case. Heres how you do it. The drive is taken off the locating bolt in the centre of the auto unit ie the one you tighten the unit to the mag. Obtain a good quality 5/16 socket a one with multi positions internally that look like serations (Brittol etc). Measure the distance between the base of the nut on the auto adv unit to the tag base of the angle drive. Turn the socket down on a lathe until you have 5th clearance (end float)the square end. Now you have a socket with serations one end and nothing the other. Cut two half moon shapes to fit into the end so the tag on the angle drive slots between the half moons. Braze into position and turn off any excess material. This now sits on the mag nut and drives your rev counter. Simple.Any problems give me a call 07952-866193. I was going to have a batch made but could`nt see the demand. It does not effect the running of the engine and the socket if machined/brazed correctly just sits there and must drive the rev counter. </p><p>Regards Garry</p></blockquote><p></p>
[QUOTE="manxnortonman, post: 4191, member: 929"] [b]Rev counter drive[/b] Trevor, It can be done as I have fitted a 5" rev counter to my rapide which has an auto adv/retard mechanism. I assume you have the normal angle drive on your timining case. Heres how you do it. The drive is taken off the locating bolt in the centre of the auto unit ie the one you tighten the unit to the mag. Obtain a good quality 5/16 socket a one with multi positions internally that look like serations (Brittol etc). Measure the distance between the base of the nut on the auto adv unit to the tag base of the angle drive. Turn the socket down on a lathe until you have 5th clearance (end float)the square end. Now you have a socket with serations one end and nothing the other. Cut two half moon shapes to fit into the end so the tag on the angle drive slots between the half moons. Braze into position and turn off any excess material. This now sits on the mag nut and drives your rev counter. Simple.Any problems give me a call 07952-866193. I was going to have a batch made but could`nt see the demand. It does not effect the running of the engine and the socket if machined/brazed correctly just sits there and must drive the rev counter. Regards Garry [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Mechanical rev counter drive
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