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1964 CB77 Intermittent Electrical problem

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hefyjefy
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Posts: 29
Joined: Mon Dec 16, 2013 12:33 am
Location: California Central Coast

1964 CB77 Intermittent Electrical problem

Post by hefyjefy » Sun Apr 19, 2020 4:14 pm

Bike is original except for the rectifier which I replaced about a year ago, new battery about 6 months ago as it was little reluctant to start with the button. Until today it has been solid, no problems (apart of course from the normal 3rd gear thing), I take it for a ride most Sundays.
Today first of all it quit as soon as I turned on the headlight, then started and ran OK for a bit (headlight off and heading home). It quit twice more, each time it looked like the ignition had been disconnected (neutral lamp didn't come on), turning the ignition off and back on seemed to get it going again. Of course, once I got it home I could not reproduce the problem...
My guess is a poor connection somewhere, probably under the seat, but before I start pulling things apart anybody have any thoughts?
Geoff

DJM
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Joined: Thu Oct 09, 2003 1:54 pm
Location: Chesterfield UK

Re: 1964 CB77 Intermittent Electrical problem

Post by DJM » Sun Apr 19, 2020 6:00 pm

Check that it has the correct length fuse fitted and that the to halves of the fuseholder aren't starting to unscrew.

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Muddy
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Posts: 208
Joined: Wed Mar 30, 2011 11:03 pm
Location: Sunshine Coast, QLD, Australia

Re: 1964 CB77 Intermittent Electrical problem

Post by Muddy » Mon Apr 20, 2020 4:43 am

Now that sounds obscure enough to be the voice of experience?
Thanks.

Regards

Muddy

'64 C72

hefyjefy
honda305.com Member
Posts: 29
Joined: Mon Dec 16, 2013 12:33 am
Location: California Central Coast

Re: 1964 CB77 Intermittent Electrical problem

Post by hefyjefy » Mon Apr 20, 2020 12:01 pm

Yes it does! Thanks!

DJM
honda305.com Member
Posts: 551
Joined: Thu Oct 09, 2003 1:54 pm
Location: Chesterfield UK

Re: 1964 CB77 Intermittent Electrical problem

Post by DJM » Mon Apr 20, 2020 1:15 pm

Not really personal experience, just an obvious thing which would cause loss of all power, after that check ignition switch and wiring on same, then things get a bit more obscure, bad battery connections or earth connection. Be sure to less us know what you find, that way we all learn.

Good Luck

hefyjefy
honda305.com Member
Posts: 29
Joined: Mon Dec 16, 2013 12:33 am
Location: California Central Coast

Re: 1964 CB77 Intermittent Electrical problem

Post by hefyjefy » Mon Apr 20, 2020 5:42 pm

Ha! - well that was the problem! Not only was the cap loose but the fuse had fallen apart, see image.
Thanks, I would have got there eventually but this saved me some time - vibration over 50 years you think? I doubt very much if this is the original fuse but I have owned the bike since 2014 and have never changed it...
Geoff
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Img_8424.jpg

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Muddy
honda305.com Member
Posts: 208
Joined: Wed Mar 30, 2011 11:03 pm
Location: Sunshine Coast, QLD, Australia

Re: 1964 CB77 Intermittent Electrical problem

Post by Muddy » Tue Apr 21, 2020 5:47 am

DJM wrote:
Sun Apr 19, 2020 6:00 pm
Check that it has the correct length fuse fitted and that the to halves of the fuseholder aren't starting to unscrew.
Wow - impressive - got it first go - I'm gunna contact you with my problems first up now :-)

Well done.
Thanks.

Regards

Muddy

'64 C72

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