SOHC.co.uk Forums > CB750

Battery

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Speed:
Green 1, looks like we are close by, do you ever run out to Krazy horse or Bentley?

Lobo:
... a couple of years ago I hot wired an ammeter into my 400/4; and was disappointed to find pootling about the country lanes drained the battery. Can’t remember the threshold, but a useful 3500 rpm or so was needed simply to keep the system in check. Bottom line; back in the ‘70s we didn’t really ride with lights on (daytime) - now it’s a given. The alternator simply wasn’t up to the job of 24/7 lighting (unless at high rpm) - so here is the downfall. It’s easy enough to ‘do the math’ wrt “charge in” and “drain out”...(versus rpm).. all found easily in the various manuals. But bottom line, certainly on my old Hondas a decent rpm is required to offset the lighting.

Bryanj:
The number that springs to mind is at least 3,000rpm to break even, I once had a 500 where occasionally the regulator points would stick open between no charge and half charge and you could see the lights dim till the next bump got them moving again

Woodside:
years back i would red line everywhere it was more of a target than a warning...so no charging issues...
now i poodle about abit more...so it can sometimes be an issue...
note to self.....speed up!

MarkCR750:
I have fitted a superbright white LED side light/parking light bulb in my CBR1000F to act as a daytime headlight after having problems running the headlights and heated grips at the same time, no more problems and the light is bright enough to be seen by (but not to “see with “ in the dark of course)

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