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How to run a CB77 without a battery?
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56_oval
honda305.com Member


Joined: 24 Oct 2010
Posts: 277
Location: Dallas, TX

PostPosted: Thu Apr 05, 2012 1:34 pm    Post subject: How to run a CB77 without a battery? Reply with quote

Just what it says. Is there a way? And I'm not talking about using one of those little boxes, I mean completely batteryless. Kickstart only and electrics run off of stator...
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davomoto
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Joined: 18 Nov 2006
Posts: 2515
Location: Marin County CA

PostPosted: Thu Apr 05, 2012 2:34 pm    Post subject: Reply with quote

I've done it with a computer grade capacitor, but haven't managed to get a working headlight yet. The excess power from the stator needs to go somewhere, so the "battery eliminator" fills that need.

Davo
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Hotshoe
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Joined: 30 Mar 2010
Posts: 298
Location: Nawlins

PostPosted: Thu Apr 05, 2012 4:58 pm    Post subject: Reply with quote

There's a way to convert a stock 305 dyno (with battery) to a magneto (no battery).
I had a racer in the 60's that had one and the bike in the photo has one.
Don't know how it's done or if that would accomplish what you're trying to do.
If you're interested, my pal who owns the bike and I had talked about reverse engineering it next time I'm out in SoCal, maybe next month.



Eugene's flattracker 2 - Copy.JPG
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Eugene's flattracker 2 - Copy.JPG


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56_oval
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Joined: 24 Oct 2010
Posts: 277
Location: Dallas, TX

PostPosted: Thu Apr 05, 2012 5:05 pm    Post subject: Reply with quote

I'd love any info available. Did you convert that bike to right hand shift as well? If you could fill me in on that as well, that would be awesome. After the wreck, the left foot doesn't work so well...
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Hotshoe
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Joined: 30 Mar 2010
Posts: 298
Location: Nawlins

PostPosted: Thu Apr 05, 2012 10:34 pm    Post subject: Reply with quote

I'll let you know what I find out about the magneto conversion.
Sorry about your foot but I'm not sure if the right side shift is a practical conversion.
It was originally done for a flat track engine (turn left, go fast, repeat), I'll ask the current owner if he knows anything about it.
Bill Engvall thought of the day..... how about converting your Superhawk shift linkage to a hand shift?
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brewsky
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Joined: 23 Jul 2008
Posts: 1730
Location: Princeton, WV

PostPosted: Fri Apr 06, 2012 6:08 am    Post subject: Reply with quote

Haven't tried it myself, but worth a look:

http://www.oregonmotorcycleparts.com/BEC.html

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66 dream, 78 cb750k, 02fz1, 09 wing
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mike in idaho
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Joined: 29 Jan 2012
Posts: 397
Location: orofino, idaho

PostPosted: Sat Apr 07, 2012 10:08 am    Post subject: Reply with quote

Hotshoe wrote:
There's a way to convert a stock 305 dyno (with battery) to a magneto (no battery).
I had a racer in the 60's that had one and the bike in the photo has one.
Don't know how it's done or if that would accomplish what you're trying to do.
If you're interested, my pal who owns the bike and I had talked about reverse engineering it next time I'm out in SoCal, maybe next month.

I did it with a pair of Honda 50 coils and re-wiring the alternator. You need to separate the connections in the alternator harness and re-wire it to combine one daytime coil and one lighting coil to run each side. I used the early Honda a/c type ignition coils and oversize(Mallory) condensers. The spark advance needs to locked at full-open, so the magnets in the rotor are lined with the stator coils when the points open, to get the most spark energy. With the advance working it's almost impossible to kick start.

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'65 YG1
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