Black spark plug
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Black spark plug
I just pulled my plug. It was jet black, and smelled and looked like is was covered in gas. What would cause this? I just put new boyesen reeds in it and desert pipe on it about 5 miles ago. I plan on doing some carb tuning tomorrow. I have 3 mains and 3 pilots to play with other than the stock ones. I am running 50:1 motul 800 and 93 octane in it now. I have only put about 8 to 10 gallons through it since I have owned it. This is the first time I pulled the plug. It other wise runs great.
Ryan Z
1999 KDX220
FMF Gnarly Desert
Boyesen 607's
Air Box Mod with No Toil Filter
12 tooth front sprocket
Jimmy Button Bars
Tusk Bark Busters
.42 kg Racetech springs
Maier MX fender
1999 KDX220
FMF Gnarly Desert
Boyesen 607's
Air Box Mod with No Toil Filter
12 tooth front sprocket
Jimmy Button Bars
Tusk Bark Busters
.42 kg Racetech springs
Maier MX fender
- canyncarvr
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Re: Black spark plug
Engine is **most likely** running too rich.svtman79 wrote:I just pulled my plug. It was jet black, and smelled and looked like is was covered in gas. What would cause this?
It other wise runs great.
Nothing like it will when it's tuned.
**edit to be correct..but that's where my money is.
Last edited by canyncarvr on 12:26 am Dec 21 2009, edited 1 time in total.
Consider the source
Using a perceived level of knowledge to boost my self worth.
Non impediti ratione cogitationis
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CC is right - Lots of info on this site concerning jetting. Perform a search.
FWIW - Even a properly jetted bike can have a wet plug smelling like gas. Know what you need to do prior to pulling the plug for a plug check. New reeds and a quick run with a new pipe followed by a minute or two of putting around or just backing off the pipe and slowing down shifting through the gears will not give you a good plug reading.
FWIW - Even a properly jetted bike can have a wet plug smelling like gas. Know what you need to do prior to pulling the plug for a plug check. New reeds and a quick run with a new pipe followed by a minute or two of putting around or just backing off the pipe and slowing down shifting through the gears will not give you a good plug reading.
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- canyncarvr
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That is a fact. A true one, too!
I stand corrected....and did.
The color of the plug doesn't tell you much of anything in the way of air/fuel mixture. Color comes more from temperature and fuel charactertistics (additives and such).
I stand corrected....and did.
The color of the plug doesn't tell you much of anything in the way of air/fuel mixture. Color comes more from temperature and fuel charactertistics (additives and such).
Consider the source
Using a perceived level of knowledge to boost my self worth.
Non impediti ratione cogitationis
bike profile: !clicky!