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Author Topic: Plug reading  (Read 4691 times)

Offline bikesnbones

  • ^ Proficient Motobricker
  • Posts: 113
Plug reading
« 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.


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  • Peterborough UK

Offline The Mighty Gryphon

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Re: Plug reading
« Reply #1 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?
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline johnny

  • TrailBrakingThrottleWhacker
  • ^ Quintessential Motobricker
  • Posts: 7652
  • Whacking...n...Chopping Sliding...n...High Siding
Re: Plug reading
« Reply #2 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
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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline bikesnbones

  • ^ Proficient Motobricker
  • Posts: 113
Re: Plug reading
« Reply #3 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.
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  • Peterborough UK

Offline WayneDW

  • ^ SuperNatural Motobricker
  • Posts: 638
Re: Plug reading
« Reply #4 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.
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  • Minneapolis, MN, USA
  • 1992 K75RT

Offline Chaos

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  • Posts: 3157
  • Mars needs women!
Re: Plug reading
« Reply #5 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. 
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline 552255

  • ^ Motobrick Curious
  • Posts: 76
Re: Plug reading
« Reply #6 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.
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'97 K1100LT-SE
'96 k1100RS-SE

Offline johnny

  • TrailBrakingThrottleWhacker
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  • Posts: 7652
  • Whacking...n...Chopping Sliding...n...High Siding
Re: Plug reading
« Reply #7 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
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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline bikesnbones

  • ^ Proficient Motobricker
  • Posts: 113
Re: Plug reading
« Reply #8 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.
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  • Peterborough UK
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