SOHC.co.uk Forums > CB750

Oil pressure issue / motor rebuild

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Spitfire:
Mine's still running on Duckhams 20/50, used it since 1976 (not the same oil) though I will have to change over soon as my "stock" of Duckhams has run out.

Cheers

Dennis

K2-K6:
That 12.5 appears too low for a battery that's just been charged.

A healthy one that is new will be about 12.95v with full charge and getting very much below 12.6v with no load would normally indicate that it really doesn't have much left in the way of starting grunt.

You could try jumping it off another vehicle,  the battery size (if bigger)  is immaterial but it will just turn over for longer before slowing down.

Trigger:
I agree with K2-K6, your battery needs a big boost. You cant have too much pressure, that is what the pressure relief is for.
 

MrDavo:
I put it back on charge last night. I just checked, 12.8 v, still struggling to turn the motor over at all. It's not a very old battery, but it is old tech, I managed to stain our stainless sink putting the acid in! I have seen a yellow glass mat one on eBay, I have a similar one on my Harley, expensive but bomb proof.

I can check the connections are tight try jumping from a car battery, but I still worry it's tight, and if it doesn't wiz round with a bigger battery I will try 10/40. Should there be an earth strap somewhere? We have a painted engine bolted in a painted frame when all's said and done.

Trigger:
Yes, you need a earth from the battery to the frame. The eye of earth lead has the top rear engine bolt through it.
If you are confident that your clearance is spot on and oil is in full circulating , then hook a car battery up.

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