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Old 03-19-2011, 06:24 PM   #1 (permalink)
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spark plug black and sometimes falls on its face

today i was bored after puttin wheels back on recon so i took side panel off and pulled spark plug out and it was black, most of the threads were too. it was also just a little wet and when i rubbed the threads across my finger it left the soot trails across it and felt a little damp. im wondering if this normal for it to be damp and really black, the only "mod" i have is i cut the end of stock muffler off and pulled the guts out to improve sound, then rewelededit doesnt feel like it has any more oomph but sounds better. this wouldnt hurt it any would it, still has original carb settings other than i dinked with idle a little but got it back where it should be. also sometimes when at idle if i WOT it it stumbles for a few revs the takes off but not always. does this sound like it needs fuel air mixture adjusted or just a good cleaning or do i need to break down and rejet, i dont really want to if adjusting ,mixture will help. i have not done anything to it other than the idle and exhaust deal and the airbox lid is on all the time with an oem air filter. its starts nice though, if its a nice day just tap starter button and it fires up, if its cold its not as easy but thats expected. any input from yall engine wizz's would be appreciated.

Last edited by bobs330; 03-19-2011 at 06:36 PM.
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Old 03-19-2011, 06:52 PM   #2 (permalink)
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Taking the guts out of the muffler wouldn't make it rich, it would make it lean if anything.

How long has the sparkplug been in? Do you have a good smooth, steady idle? The float valve may have stuck open sometime in the past and let it flood some. That would make the plug black.
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Old 03-19-2011, 06:58 PM   #3 (permalink)
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spark plug is maybe 2 or 3 months old, i think. yeah it purrs at idle. when its cold it sometimes stalls but not very often. i dont know if this makes a difference but i almost never close petcock just leave it on mostly.
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Old 03-19-2011, 07:06 PM   #4 (permalink)
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spark plug is maybe 2 or 3 months old, i think. yeah it purrs at idle. when its cold it sometimes stalls but not very often. i dont know if this makes a difference but i almost never close petcock just leave it on mostly.
Leaving the fuel on wouldn't cause a problem unless the float valve is sticking. Sometimes, a float valve will stick and then it will free itself up. That may have happened without you even knowing it and it might have flooded, causing the plug to turn black.
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Old 03-19-2011, 07:12 PM   #5 (permalink)
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ok. my main concern is too lean but i dont think it is. it runs really good for a 250 only sometimes does it not want to rev like it should but after about 1 sec at most it takes off.
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Old 03-19-2011, 07:17 PM   #6 (permalink)
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ok. my main concern is too lean but i dont think it is. it runs really good for a 250 only sometimes does it not want to rev like it should but after about 1 sec at most it takes off.
Yeah, better rich than lean. Just keep the oil changed regularly, but as long as it's running smooth and you don't see any black smoke, it should be OK.
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Old 03-19-2011, 07:17 PM   #7 (permalink)
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putting around in the trails will make a plug appear to be alot richer than the engine seems try riding it around until warm then run it in an open field or where you can strectch her legs out wind out all the gears when you get to 5th at wid open throttle hold the shifter up so it will coast shut it down while your in the throttle once you turn it off and it stops running let off the throttle and stop pull the plug and look at it then. That will give you a better reading.
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Old 03-19-2011, 07:26 PM   #8 (permalink)
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ok ill try that if i can tomorrow. i usually put alittle thru some technical trails butn when i can i gun it. when im on the beach i really open it up thru all the gears and run about topspeed ,dont laugh though its only 40 mph or so in the sand. i just know that if its wet its might be alil rich which i understand is better than lean..
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