SOHC.co.uk Forums > CB750

Charging System Specification

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philward:
I've seen that graduation from the manual and it seems that if the race alternator and its rec/reg isn't that much difference. So, keeping the rec/reg from that system when I convert back to standard alternator should be ok.
Andy at 'Good Bits' has developed a race alternator cover that accomadates the stator in the cover (as opposed to bolting on to were the starter gear fits on the Electrex system) but due to the cost including the Electrex system is over £1000 he's hesitating to produce me a cover (about £320 to me as I have the Electrex system already). This would allow the starter to be installed and retain the narrow profile of the race alternator.
Based on the race alternator appearing to have similar characteristics to the standard system, (Electrex spec sheet says output is 25 amps - IS THAT SUFFICIENT?). I might push Andy to make me a cover as a one off.

Sesman:
25A = circa 300W. Should be enough I would have thought?

K2-K6:
I think it was Andy I was chatting to at the last DS open day. He had his circuit race 750 there and trouble to get it firing so we could hear it, got it in the end though and sounded good.

philward:
K2 - K6 , here's mine shortly after initial start up  - has baffles fitted and before Smiths sorted calibration of rev counter. Made few mods since.

https://www.youtube.com/watch?v=YmL8YYWeUMo

PS, if you look at the digital speedo, you can see the charging voltage (bear in mind that the rev counter is reading 1000 rpm too much at the time)

Oddjob:
IIRC Phil the standard system only pushes out 200w. So if the Electrex system pushes out 300w that's a big improvement.

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