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Author Topic: Cb175 voltage regs?  (Read 3225 times)

Offline Arch stanton

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Cb175 voltage regs?
« on: July 23, 2019, 09:52:21 AM »
Can anyone explain why. The European market 175 had a voltage regulator.
When the US market bike didn't?
Tia.
Sean
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Offline mike the bike

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Re: Cb175 voltage regs?
« Reply #1 on: July 23, 2019, 02:45:39 PM »
Maybe because the US version had rge lights on permanently so didn't need a regulator because the alternator is going flat out anyway.
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Offline Arch stanton

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Re: Cb175 voltage regs?
« Reply #2 on: July 23, 2019, 06:22:38 PM »
That is indeed a possibility.
It's just that both me and a mate have US market CB, s neither of them charge.
But my UK bike charges fine.
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Offline Bryanj

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Re: Cb175 voltage regs?
« Reply #3 on: July 23, 2019, 11:34:12 PM »
Isnt the reg on those just a zenner dump to earth?
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Offline AshimotoK0

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Re: Cb175 voltage regs?
« Reply #4 on: July 24, 2019, 12:06:05 AM »
Quote from: Bryanj on July 23, 2019, 11:34:12 PM
Isnt the reg on those just a zenner dump to earth?
  It is the same function as A Zener diode Bryan but a much more precise cut off voltage using a 'crowbar' electronic circuit potted in resin.Nothing to stop fitting the unit from  a CB175 or CB250/350  to any single phase alternator old Honda that doesn't have the regulator... like the CB450K0 for example
« Last Edit: July 24, 2019, 12:09:50 AM by AshimotoK0 »
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Offline Bryanj

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Re: Cb175 voltage regs?
« Reply #5 on: July 24, 2019, 04:51:04 AM »
Thats what i thought Ash, so if the US ones dont charge it has to be a stator fault or witing connection fault, unless the magnetism on the rotor has done a runner
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Offline AshimotoK0

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Re: Cb175 voltage regs?
« Reply #6 on: July 24, 2019, 08:33:56 AM »
Quote from: Bryanj on July 24, 2019, 04:51:04 AM
Thats what i thought Ash, so if the US ones dont charge it has to be a stator fault or witing connection fault, unless the magnetism on the rotor has done a runner

I reckon on a lot of older Honda's (Bomber 450 is a prime example) the loss of magnetism with age is a big factor in lack of charging Bryan
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