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1970 A50 timing aperature #780448 08/03/19 7:22 pm
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Danam Offline OP
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Hi, I’m trying to set the ignition timing on my 1970 A50. My manual (which is for an older model) talks about inserting a tool into an ‘aperture’ on the front right side of the case. I don’t see the same but I do see a bolt, the parts book calls it a ‘case seal’. Does the 1970 A50 have the aperture?

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Re: 1970 A50 timing aperature [Re: Danam] #780453 08/03/19 7:51 pm
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leon bee Offline
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70 has the hole, it's threaded and has a plug rather than the earlier cover plate. Stick a narrow screwdriver in there and you'll find the slot in the crank.

Re: 1970 A50 timing aperature [Re: leon bee] #780459 08/03/19 8:03 pm
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Danam Offline OP
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Is the plug??
[img]https://drive.google.com/file/d/0B4rEJnCewvHDRHBManROLVduX21ibVNkU01kT0dhbWJjak1N/view?usp=sharing[/img]

also, if I use a small screw driver in that hole and find the slot in the flywheel, that is TDC full-advanced?

Last edited by Danam; 08/03/19 8:07 pm.
Re: 1970 A50 timing aperature [Re: Danam] #780460 08/03/19 8:31 pm
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leon bee Offline
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Yes, that's it. I can only remember stuff about a week these days, but an allen wrench fitted in that slot- your timing pointer at the alternator rotor should match up, too. Go with that.

I don't see that you ever reported if you got that thing pumping oil.

Re: 1970 A50 timing aperature [Re: leon bee] #780466 08/03/19 8:55 pm
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Danam Offline OP
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At my rotor I see two holes where a pointer might have been once... which hole should I look at?
[img]https://drive.google.com/file/d/0B4rEJnCewvHDbnZHYUZWNkVGUEo1TjdZUTBPSTdBVktTbTE0/view?usp=sharing[/img]

I did eventually get oil flowing, I updated my post, thanks!

Re: 1970 A50 timing aperature [Re: Danam] #780468 08/03/19 9:16 pm
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gunner Offline
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I think its a 5/16 or 7/16 allen key which fits the slot, cant remember which.


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
Re: 1970 A50 timing aperature [Re: Danam] #780486 08/04/19 1:13 am
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leon bee Offline
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The two holes where that nail can go, one of them is for ET ignition. There is a picture in the BSA manual which is which, I'm not near any of my stuff but google should find it.

Re: 1970 A50 timing aperature [Re: Danam] #780487 08/04/19 1:25 am
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leon bee Offline
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Look at the front hole:

https://www.google.com/search?q=bsa+timing+mark&tbm=isch&source=univ&sa=X&ved=2ahUKEwiWxujohejjAhVIWq0KHVGzDewQsAR6BAgGEAE&biw=1164&bih=526#imgrc=xgHqUWXUya-BKM:


Jesus, my computer updated itself now I can't do a link. The nail would have been in the front hole for an A65, surely A50 same but not sure. You only need that for your timing light, you can get it close enough to start.

Last edited by leon bee; 08/04/19 1:28 am.
Re: 1970 A50 timing aperature [Re: Danam] #780503 08/04/19 6:26 am
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Allan Gill Online Happy
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Can't get your link to work Leon. However the hole closer to 3 o'clock (34 degrees) is correct for the timing pin on all bikes, A65s used to use the hole closer to 6 o clock (37 degrees) until around 66/67


beerchug
Re: 1970 A50 timing aperature [Re: Danam] #780529 08/04/19 2:45 pm
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Jon W. Whitley Offline
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Originally Posted by leon bee
Look at the front hole:

https://www.google.com/search?q=bsa+timing+mark&tbm=isch&source=univ&sa=X&ved=2ahUKEwiWxujohejjAhVIWq0KHVGzDewQsAR6BAgGEAE&biw=1164&bih=526#imgrc=xgHqUWXUya-BKM:

Jesus, my computer updated itself now I can't do a link. The nail would have been in the front hole for an A65, surely A50 same but not sure. You only need that for your timing light, you can get it close enough to start.



BSA Twins Timing Pointer

Attached Files BSA Timing Pointer.jpg

Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"

Re: 1970 A50 timing aperature [Re: Danam] #780536 08/04/19 4:27 pm
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Danam Offline OP
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Thanks everyone!


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