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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: bikesnbones on May 30, 2015, 11:01:44 AM

Title: Plug reading
Post by: bikesnbones on May 30, 2015, 11:01:44 AM

Just wondered if there are any good plug readers here.
After 200 miles on my replacement engine, I took mine out for an inspection.
The good news is that all are consistent in colour, but they do indicate lean to me,
I know these bikes run lean anyway, but is this normal.

(http://s14.postimg.org/qwblktiw1/plugs.jpg) (http://postimg.org/image/r92zr015p/full/)

Title: Re: Plug reading
Post by: The Mighty Gryphon on May 30, 2015, 01:13:36 PM

Yeah, they do look a bit lean to me as well.  But I am not experienced enough with these engines to know if that is going to hurt anything.  If we were dealing with carburetors I'd probably go for a bit bigger main jet, but only after double checking the ignition timing and the valve clearances.

Remind me, does the bike have an aftermarket exhaust?

Title: Re: Plug reading
Post by: johnny on May 30, 2015, 05:33:37 PM

greetings...

those plugs are reaching out to me and saying i needs me more redline riding... this motobrickers abides... you oughtta too...

j o

Title: Re: Plug reading
Post by: bikesnbones on May 31, 2015, 07:00:31 AM

Quote from: The Mighty Gryphon on May 30, 2015, 01:13:36 PM

Remind me, does the bike have an aftermarket exhaust?

No aftermarket pipe.
Everything bog standard.
I have posted up this photo on another forum I frequent, and the concensus there is that they look fine.
I'll probably get it hooked up to a gas analyzer sommetime soon.

Title: Re: Plug reading
Post by: WayneDW on May 31, 2015, 08:57:23 AM

Look fine to me.  But thanks for the reminder, I should pull mine for a look see too.  Haven't done that in a while.

Title: Re: Plug reading
Post by: Chaos on May 31, 2015, 10:13:56 AM

look good to me.  Electrode has decent tan color shifting near tip, base of threads should be almost sooty, porcelain can be white with just a bit of tan,  Hard to tell too much from that photo. 

Title: Re: Plug reading
Post by: 552255 on May 31, 2015, 10:51:55 AM

Is it practical/or even possible to change the fuel/mixture?...well, I'm sure it possible, but wondering if one can make such adjustments easily.  Just curious really, my bike runs super right now, but I have seen the plugs look much more 'fouled' than those for sure.

Title: Re: Plug reading
Post by: johnny on May 31, 2015, 11:13:33 AM

trial and error... when i was looking for more top end... i backed out the jets 1 turn... the skin on my face would yaw to the side if my nose wasnt exactly straight... i went in 1/2 turn and all is yeeehaaaa again... more top end with no yawing facial skin...

j o

Title: Re: Plug reading
Post by: bikesnbones on May 31, 2015, 11:29:18 AM

Quote from: 552255 on May 31, 2015, 10:51:55 AM

Is it practical/or even possible to change the fuel/mixture?...

I've checked, and there is the facility to perform this adjustment on the UK model, but not other European bikes.
Strange.
I don't know what applies to your models.