Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: Arch stanton on October 06, 2018, 10:11:56 PM

Title: Generator output??
Post by: Arch stanton on October 06, 2018, 10:11:56 PM

Hello.
After reading comments on here regarding the weaknesses in the Cb750k charging system regarding headlight build wattages.
I'm wondering if there is any difference in output between the early K models & the F models?
I ask this because I used to use 100w/65w H4 bulbs in my old F1 without any charging problems. I did a lot of night riding at that time as the bike was my only transport.
Your comments would be appreciated.
Sean.

Title: Re: Generator output??
Post by: Bryanj on October 06, 2018, 11:09:09 PM

The only different(higher output) generator is on the 750 auto

Title: Re: Generator output??
Post by: Arch stanton on October 07, 2018, 06:57:29 AM

I wonder why the Auto needed different genny.
Did they have a larger output?
Was it the same fitment as the others?
Would fitting the Auto genny to the other models be a worthwhile upgrade?

Title: Re: Generator output??
Post by: BigAl (Alan) on October 07, 2018, 10:44:02 AM

The field coil in the CB750K is rated at 190watt (less 19w running) net power 171watt. As  the CB750A f/coil is rated at 250watt (less 40w running) net power 210watts.
They are interchangeable, not sure why Honda fitted a higher wattage coil in the CB750A...increased battery size? 

Title: Re: Generator output??
Post by: Moorey on October 07, 2018, 01:51:17 PM

Increased battery size and no kickstart backup.

Title: Re: Generator output??
Post by: hairygit on October 07, 2018, 02:28:46 PM

They DO have a kickstart, but it lives under the seat.

Title: Re: Generator output??
Post by: Woodside on October 07, 2018, 02:31:23 PM

Probably doesn't rev so freely either being automatic...
So doesn't get the higher voltages so often....Just a thought

Title: Re: Generator output??
Post by: Moorey on October 07, 2018, 04:17:10 PM

Quote from: hairygit on October 07, 2018, 02:28:46 PM

They DO have a kickstart, but it lives under the seat.

I stand corrected then, and doffs his hat to the gent in the corner.