Honda-SOHC

General => New Member Introductions => Topic started by: Marcusash on February 27, 2025, 11:42:48 AM

Title: 400 four contact breaker wiring.
Post by: Marcusash on February 27, 2025, 11:42:48 AM

Hi All.
Does anyone have a clear diagram of the wiring from the capacitor to the contact breakers, showing correct positioning of insulators etc?
Manual says - 'replace in the order they were removed'
It is the blue and yellow wires, and the wires from the caps that is troubling me.
Many thanks.

Title: Re: 400 four contact breaker wiring.
Post by: K2-K6 on February 27, 2025, 12:33:35 PM

I've not a diagram, but in simple terms though .... none of the components (points spring, bolt, cap tag etc) can touch the "post" they are bolted to.

If that were the case, then one of those would track to earth and prevent it working.

Equally, the points spring, coloured wire, cap tag .... all have to have connection with each other as they are all "in circuit" for switching the coils.

The only earth present there should take the route of along the spring to points "anvil" to be switched to earth or not when points open and close.

Title: Re: 400 four contact breaker wiring.
Post by: K2-K6 on February 27, 2025, 12:54:38 PM

Additional information from a Honda workshop manual shows:-

From nearest to crank / cam lobe, the little bolt,  metal washer under head, wire from coil, insulation sleeve washer (the tyrpe that has a sleeve effect to stop the bolt touching the interior of post location) then that lot passes through post to then have another sleeve insulation washer, points spring, cap tag, then metal washer, spring metal washer, finally the nut.

Title: Re: 400 four contact breaker wiring.
Post by: Bryanj on February 27, 2025, 03:49:58 PM

Looking at the small bolt and starting at the head
Plain washer
Blue or yellow wire
Spring from contacts
Fiber washer
Fiber sleeve
Solid mounting
Fibre washer
Condenser wire
Plain washer
Spring washer
Nut

The fibre sleeve may be part of one of the fibre washers making it a "top hat" washer.

What you are doing is connecting the blue/yellow wire to the condenser and spring to contact using the bolt whilst isolating the assembly from the static post

Hope that makes sense

Title: Re: 400 four contact breaker wiring.
Post by: McCabe-Thiele (Ted) on February 27, 2025, 04:59:34 PM

Does this photo help?
Blue on the left side
Yellow on the right side.

(https://live.staticflickr.com/65535/53718155557_bbfd188498_o.jpg) (https://flic.kr/p/2pQTA8P)500 ponts plate (https://flic.kr/p/2pQTA8P) by Macabe Thiele (https://www.flickr.com/photos/187487200@N03/), on Flickr

Title: Re: 400 four contact breaker wiring.
Post by: Marcusash on March 01, 2025, 09:05:22 AM

Brilliant... Thank you all. Will put it all together and see what happens.