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72 lighting timing rebuild
#781186 08/11/19 1:56 pm
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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
bezza Tim #781201 08/11/19 7:15 pm
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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, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
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Re: 72 lighting timing rebuild
bezza Tim #781205 08/11/19 8:12 pm
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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
bezza Tim #781231 08/12/19 12:54 am
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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
bezza Tim #781245 08/12/19 4:01 am
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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
bezza Tim #781614 08/16/19 3:09 am
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Points goes in the bin.

Pazon or Trispark goes on the bike.

Re: 72 lighting timing rebuild
bezza Tim #781642 08/16/19 1:35 pm
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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

Re: 72 lighting timing rebuild
bezza Tim #794423 12/31/19 4:04 am
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I have two indexes in the flywheel. Which one do I use to set the timing?

Re: 72 lighting timing rebuild
bezza Tim #794442 12/31/19 8:50 am
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Motorcycles have points, bikes have EI. :-)


There are no bosses in a technical discussion
(Doug Hele, 1919 - 2001)
Re: 72 lighting timing rebuild
bezza Tim #794487 12/31/19 7:29 pm
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bezza, first let me echo the advice given above about finding a shop manual that outlines the correct timing procedure.

Not sure what you mean by "indexes in the flywheel", do you mean slots? All of the A65s I've worked on have only one slot, at the full advance point. If yours does have two slots, one will be at top-dead center, and the other will be at the full advance point (34 degrees BTDC on most). It should be easy to determine which is which, and when the crank is positioned at the full advance point, the timing needle in the primary cover should line up with the timing mark on the alternator rotor.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: 72 lighting timing rebuild
Mark Z #794490 12/31/19 7:55 pm
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Thank for the help. Got it

Re: 72 lighting timing rebuild
bezza Tim #794504 12/31/19 11:31 pm
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When installing the auto advance unit is there a certain position this goes in?

Re: 72 lighting timing rebuild
bezza Tim #794511 01/01/20 12:18 am
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Originally Posted by bezza Tim
When installing the auto advance unit is there a certain position this goes in?


yes , it must be set in full advance position , you will need to turn it against the direction of rotation and hold it there manually (you are moving it against the points cam) and make sure the (correctly gapped) points are just starting to open , use a cigarette paper so you can tell . then push the assembly onto the taper and lock it up ........that is near enough to get it running (called static timing) then when you have it running check the timing with a timing light and fine tune by lossening the slotted screws securing the points plate and slightly turning the assembly, Make sure you check with the light at enough revs so it will be fully advanced . The marks on the rotor and the case pin should line up (assuming no one has messed with the marks and that u have the pin in your cover.

obviously you will have set the piston at the required distance before TDC with both valves fully closed.......make sure you set the correct point set for the piston you are using (ie RHS points corresponding to RHS piston ) as a reference or you will be 180 degrees out and it will drive you nuts when you cant figure why it wont start .........good luck its not that hard


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
Re: 72 lighting timing rebuild
bezza Tim #794515 01/01/20 12:39 am
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👍

Re: 72 lighting timing rebuild
bezza Tim #794516 01/01/20 12:41 am
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not hard to do but impossible to describe.

if you are talking about the two marks on the rotor, something that has not been mentioned, make sure the piston is at the top. Using the wrong mark will put the piston at the bottom.


Rich (last remaining member ThreeMustGetBeers)
"It's not always about going fast. Sometimes it's nice to slow down" (Wendy E.2016)

69 bonney
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and a Honda?

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