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CA77 Dynamic timing question

Points Based Ignition | Electronic Ignition Upgrade
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garncarz
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Location: York, PA

CA77 Dynamic timing question

Post by garncarz » Mon Sep 07, 2020 3:49 pm

Does anyone have a write-up/procedure for adjusting dynamic timing on a CA77? Thanks.

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Muddy
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Location: Sunshine Coast, QLD, Australia

Re: CA77 Dynamic timing question

Post by Muddy » Tue Sep 08, 2020 5:45 am

I'm not sure if this is what you are after, but it comes from our own Loudmouse (Ed Moore) and contains some valuable advice.

Good luck - it works well.
Attachments
Ignition Timing 1.JPG
Ignition Timing 2.JPG
Ignition Timing 3.JPG
Thanks.

Regards

Muddy

'64 C72

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brewsky
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Re: CA77 Dynamic timing question

Post by brewsky » Tue Sep 08, 2020 6:54 am

66 dream, 78 cb750k, 02fz1, 09 wing

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garncarz
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Re: CA77 Dynamic timing question

Post by garncarz » Tue Sep 08, 2020 1:54 pm

I do have a strobe timing light.

Where do I use it? Alternator stator plate?
How do I tell how many degrees before/after TDC the ignition is set (no degree markers like on a car, that I can see).
How many degrees before after TDC SHOULD it be set to?
No distributor to turn like on a car, or do you adjust via the points plate?

DJM
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Re: CB77 Dwell angle question

Post by DJM » Tue Sep 08, 2020 2:26 pm

Among the stuff in my cupboard which I never use (and never have) is a Dwell Angle meter.

I'm told by those who know about these things that setting points using a dwell meter is 'far more accurate' than using feeler gauges to check the points gap.
I'm happy to accept this but does anyone know what the dwell angle should be for a CB77 /CL77 engine?

Anyone have any experience using a dwell angle meter on these bikes?

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brewsky
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Re: CA77 Dynamic timing question

Post by brewsky » Tue Sep 08, 2020 9:37 pm

garncarz wrote:
Tue Sep 08, 2020 1:54 pm
I do have a strobe timing light.

Where do I use it? Alternator stator plate?
How do I tell how many degrees before/after TDC the ignition is set (no degree markers like on a car, that I can see).
How many degrees before after TDC SHOULD it be set to?
No distributor to turn like on a car, or do you adjust via the points plate?
Yes, shine the strobe light on the alternator rotor as it is running.
At idle, the "F" line should line up with the pointer.
At max advance with engine revved up, the double marks should line up with the pointer indicating maximum advance.
Adjust by rotating points plate.
Maintenance manual shows 40 degrees advance, although I haven't actually measured the angle of the dual advance marks.
Attachments
c72 rotor1.jpg
66 dream, 78 cb750k, 02fz1, 09 wing

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garncarz
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Posts: 210
Joined: Thu Oct 31, 2013 7:44 am
Location: York, PA

Re: CA77 Dynamic timing question

Post by garncarz » Wed Sep 09, 2020 5:41 am

Thank you.

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