SOHC.co.uk Forums > CB750

Charging test

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paulbaker1954:
The Regulator on the 500 four has an adjusting screw to alter the voltage at which point the armature pulls in. May not be the same on the 750 but just thought it worth a mention

K2-K6:
Yes Paul the 750 has the same, maybe even the same unit I'm not sure. I went off to read the 750 manual to see how to do it.

If you remove the regulator casing then inside are various adjustment screws, the two screws near each other at the points end of the assembly are for adjusting respectively the points gap and the core gap,  leave these both alone without definite knowledge of the setup.

At the opposite end of the assembly from the points is another single screw with a locknut,  if this is turned clockwise then the manual says it will decrease the voltage output.

Here's where you have to make a judgment on the stated settings as these bikes originally came with a straight wet lead acid battery and the manual includes 3 whole pages about looking after the liquid level add condition/dilution of the acid in it. Manual states a setting of 14 to 15 volts at 5000rpm with no load being drawn.
I'd set that to as close to 14 as possible for an AGM battery to take account of the change in type,  I may be wrongs but I've not seen anything that comes fitted with an AGM type that regularly charges over 14volts, most I've measured are cutting off at about 13.95 volts.

Bryanj:
Adjusting the reg should only be done with a guaranteed good fully charged battery and within certin ambient temperatures that I can't remember

El__burro:
too late, i've adjusted that at 5000rpm will not go over 14.5V
(I dont have a rev counter so I guessed)

I have also checked the gaps and it seemed ok.
el__burro

Johnwebley:
good for you,

 just keep an eye on it,

  hope its sorted for you,

 soon all the issues will be sorted,and you can enjoy  the bike and rides

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