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72 lighting timing rebuild #781186 08/11/19 1:56 pm
Joined: Dec 2010
Posts: 102
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bezza Tim Offline OP
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I just finished rebuilding my A65 and put the engine in the bike. Does anyone have a step by step instruction on have the auto advance goes in then the points plates and then the timing etc etc???
Any help of pointing me in the right direction would be great.
Thanks

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Re: 72 lighting timing rebuild [Re: bezza Tim] #781201 08/11/19 7:15 pm
Joined: Aug 2001
Posts: 4,565
gavin eisler Offline
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If you havent done this before heres two tips.
Before fitting the points plate and points, sit down with your specs on and find the correct method to adjust the gap, and the timing, study how the eccentrics cannot move anything if the pinch screws are still tight, make sure you fully understand what needs to be loosened to allow the eccentric adjusters to work.
2nd tip, the Idler pinion and AR mech rotate anti clock when viewed from the TS , or in other words opposite to the wheels rotation when travelling forward, this has confused many people, well me at least. This means the points plate moves clockwise to advance timing.

Pages B49, B50 and B51 in the 71 manual. 3 pages of great info, hard to summarize properly.
In essence set the motor to the timing marks at the Alternator , or use the case timing plug.
Then fit the AR mech loosely , but locked in full advance, adjust points plate so one set of points are just opening. Tap AR mech onto taper,turn motor and set points gaps , recheck timing with fag paper between points , rotate motor and observe strobe marks and fag paper , , coarse tune points by rotating whole plate in slots, fine tune individual sets with the chewy brass eccentric adjuster, when happy tighten up. Do the same for each set. When happy that both sets are opening at the strobe marks, unlock the AR mech and fit the centre bolt.Recheck opening points.
Make a note of which cylinder is on compression for which set of points, make sure the points wires are to the correct coil, swap if needs be.

Some good info here
http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=470563

Last edited by gavin eisler; 08/11/19 7:49 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: 72 lighting timing rebuild [Re: bezza Tim] #781205 08/11/19 8:12 pm
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raf940 Offline
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Pazon


1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando
2 olive drab WWII military bicycle replicas
Re: 72 lighting timing rebuild [Re: bezza Tim] #781231 08/12/19 12:54 am
Joined: Sep 2001
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Gordo in Comox Offline
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Tim I have emailed you the timing pages from the A65 workshop manual. Hope it helps.

Gordo


The roadside repairs make for the best post ride stories.
Re: 72 lighting timing rebuild [Re: bezza Tim] #781245 08/12/19 4:01 am
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NickL Offline
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You'll be lucky if the assemble is not worn.
Suggestions........
Pazon, Boyer, Vape etc etc. Make's life easier.

Re: 72 lighting timing rebuild [Re: bezza Tim] #781614 08/16/19 3:09 am
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Semper Gumby Online Content
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Points goes in the bin.

Pazon or Trispark goes on the bike.


Secretly Mediocre....
Re: 72 lighting timing rebuild [Re: bezza Tim] #781642 08/16/19 1:35 pm
Joined: Feb 2007
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edunham Online Content
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Personally, I like points, but I am not going to get into that debate here. My technique is about the same as Gavin's with a couple of small differences. Instead of using fag paper, I use a continuity light. Instead of locking the A/R unit, I leave it loose. That way, I can rotate the cam with a small screwdriver or a pick and make sure the light goes out just as the cam reaches the end of its travel. I have found that normally results in spot-on timing when checked with a strobe light.

Ed from NJ


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