Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: murdock on December 04, 2021, 02:54:51 PM

Title: sparks color
Post by: murdock on December 04, 2021, 02:54:51 PM

What do you think should be the perfect color of a spark plug in the cb four? ,
 dark brown ?,
light brown ?,
 gray? ,
White ?

Title: Re: sparks color
Post by: deltarider on December 04, 2021, 03:01:12 PM

Cafe con leche  ;) o marrón leonado (fawn brown).

Title: Re: sparks color
Post by: Bryanj on December 04, 2021, 05:26:14 PM

You cant get a decent plug colour with all this ethanol

Title: Re: sparks color
Post by: deltarider on December 04, 2021, 09:43:34 PM

In the other thread I've suggested a spoonful of castor oil.

Title: Re: sparks color
Post by: K2-K6 on December 04, 2021, 10:46:40 PM

I run castor oil in a old V8 car engine, purely because it smells so nice.

Mixed at 100:1 just to give it a very low blend, haven't thought to check plugs for colour but may pull one out tomorrow to have a look.

In a lawnmower and petrol generator too, lovely smell of racing R when using the generator for circular saw etc on site.

Title: Re: sparks color
Post by: deltarider on December 05, 2021, 01:50:14 PM

Have to admit I have never tried it myself. :-[ It was in an article by Joop Sijses, the chief mechanic of Honda The Netherlands, the man that educated the mecs at Honda dealers.
I did use castor oil however on my 50 year old leather bags. It was last summer and the first time I did at least something as a reward for serving me 41 years, without any care but the repair of an occasional strap.