SOHC.co.uk Forums > CB750

Where is the Battery??

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ChrisOnABike:
This might not be 750 specific, but that's what I'm working on so I'm asking this here.

In the linked photo, where is the battery?  Looks like a stock tank so I doubt it's inside, and I don't see any other place for it.  The tail looks way too small to hold it in there.

Does the bike even need a battery?  I know most systems run off the battery and the charging system just keeps it topped off.  Does this system work differently?

Thanks

http://bihamoto.sk/content/images/articles/73.jpg

AshimotoK0:
It may be that they have fitted a largish electrolytic capacitor, I did this when I was a student to my CB250K2. The 750 is 3-phase so less flickering of the lights at tick over probably. Incidently, I sussed a way of testing the regulator on the old CB twins 'pointless regulator'  a few weeks ago (CB250/350/450 etc). It's potted in epoxy but it's a Thyristor (SCR)  circuit which acts as a crowbar to voltages generated above the normal lead-acid charging voltage. The Brit bikes use a large Zener diode on a heatsink between the forks (Triumph) but it's not as elegant as the Honda (well Hitachi) solution as the Honda one has a very precise cut off at the set voltage (around 15v), which is not the case with a Zener diode.

Cheers ...AshD

royhall:
Wouldn't want to go any distance on that thing, the family jewels are at severe risk. You may also need a number plate for the UK. A non running show bike I think.

Trigger:
Yep, could be a non-running show bike. I have built some show engines with no internal parts.   

ChrisOnABike:
Wow, I would have never thought of a show bike that did not run.  Such a waste of good parts.  It also looks like there is a small switch just under the end of the tail section.

I think I would cut in a section of the petrol tank to house the battery.

The simple look of this particular machine is one I am using to base my own build from, but mine will probably need a battery.

Thanks for the replies.

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