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Fouling plugs
started by zdawg
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June 8th 2010 at 7:06 PM
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zdawg
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69 Posts 
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Member Since: March 4th 2009
Location: Canada
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Recently my cr has been fouling alot of plugs. When I take it out the plug is brown but the electrode is wet with oil. I tried cleaning it but it just sputters and then cuts out. I think it might have something to do with the carb, but im not sure. If you have any ideas please share them with me because I really dont know what to do.
Thanks,Zach
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June 8th 2010 at 8:40 PM
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Kawi_Rider_316
Team Not Even Scared
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632 Posts 
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Member Since: July 11th 2008
Location: Ocheyedan, Ia, USA
Current Dirtbike: Kx 250F
Race Number: 316
Sponsors: Spencer Motorsports
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First, plugs arent worth cleaning. Just get a new one. The reason it is fouling it sounds like you are running to rich. That is why your plug is wet. Most the time the plug will be black if it is running rich though. Is there oil running out your silencer? and what are you mixing your gas too?
"Jump for show, Corner for dough"
"In ball and stick sports they give you the balls, In Motocross you have to bring your own"
Sponsors:
Glens Sport Center, FC MODS, MSR, Sunline, Tag, Filtron, Six Six One, Steel Mx, Dunlop,
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June 8th 2010 at 11:20 PM
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Dekk
Above Average Member
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665 Posts
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Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
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Probably need to re jet it.
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June 9th 2010 at 6:28 AM
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Savage-CR
Savage
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153 Posts 
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Member Since: November 26th 2009
Current Dirtbike: I change this too much
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What are you mixing to? You will foul plugs a lot if you mix slightly rich and don't have the rpm's very high.
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June 9th 2010 at 12:27 PM
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Dekk
Above Average Member
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665 Posts
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Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
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How you liking the new 85? Havent seen any pictures of you riding her yet.
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June 9th 2010 at 2:51 PM
[ Modified June 9th 2010 at 2:54 PM
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zdawg
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69 Posts
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Im running the bike 32:1, which im pretty sure is correct. theres no oil running out of the silencer either. And dont worry, Im not keeping the rpms low haha. Can it be caused by not warming it up properly? Quote originally posted by Dekk
How you liking the new 85? Havent seen any pictures of you riding her yet.
Im lovin it man. got a 25ft tabletop built, hopefully get some pics of that later this season. And if I can ever get a landing for the new ramp hopefully start pullin some tricks off.
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June 9th 2010 at 3:19 PM
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Savage-CR
Savage
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153 Posts
Group: Members
Member Since: November 26th 2009
Current Dirtbike: I change this too much
Sponsors: Tosca Banquet Hall
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What plug are you running? You can safely lean it out to 40:1.
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June 9th 2010 at 4:36 PM
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Kawi_Rider_316
Team Not Even Scared
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632 Posts
Group: Members
Member Since: July 11th 2008
Location: Ocheyedan, Ia, USA
Current Dirtbike: Kx 250F
Race Number: 316
Sponsors: Spencer Motorsports
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In our 85's we always run 40:1. And what are your runnin for a plug? We always ran BR9EG's I think they were or 105's in our Kawi's.
"Jump for show, Corner for dough"
"In ball and stick sports they give you the balls, In Motocross you have to bring your own"
Sponsors:
Glens Sport Center, FC MODS, MSR, Sunline, Tag, Filtron, Six Six One, Steel Mx, Dunlop,
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June 9th 2010 at 6:44 PM
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zdawg
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Quote originally posted by Kawi_Rider_316
In our 85's we always run 40:1. And what are your runnin for a plug? We always ran BR9EG's I think they were or 105's in our Kawi's.
Im pretty sure its BR10EG. Thats what the owners manual says so thats what I use.
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June 9th 2010 at 7:51 PM
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Dekk
Above Average Member
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665 Posts
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Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
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With fully synthetic oil you can run a leaner mixture. What are you using for oil?
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June 9th 2010 at 8:26 PM
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zdawg
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Quote originally posted by Dekk
With fully synthetic oil you can run a leaner mixture. What are you using for oil?
Honda premium 2cycle oil. I dont think its synthetic. But Im pretty sure its not too rich, theres no oil coming out of the pipe anymore(there was when I got it), and today I checked the plug after I rode and it was dry. They usually only foul before I even get off my lawn. Thats why I kinda think its my carb, I had to get new jets because it was all starting to get worn and Im wondering if thats what messed it up.
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June 9th 2010 at 10:46 PM
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Kawi_Rider_316
Team Not Even Scared
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632 Posts
Group: Members
Member Since: July 11th 2008
Location: Ocheyedan, Ia, USA
Current Dirtbike: Kx 250F
Race Number: 316
Sponsors: Spencer Motorsports
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Where is Mx86, he is our 2-stroke expert here.
Are the jets you put in the same thing as you took out. What do you do to warm it up, you mentioned maybe you didnt do that correctly. Also wat are you running for gas, im guessning normal pump but 89, 92, or what?
"Jump for show, Corner for dough"
"In ball and stick sports they give you the balls, In Motocross you have to bring your own"
Sponsors:
Glens Sport Center, FC MODS, MSR, Sunline, Tag, Filtron, Six Six One, Steel Mx, Dunlop,
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June 10th 2010 at 8:00 AM
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Dekk
Above Average Member
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665 Posts
Group: Members
Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
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I was thinking the same thing. Haha must be out on vacation
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June 10th 2010 at 6:22 PM
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Rhythm
Rhythm master
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137 Posts
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Member Since: July 5th 2008
Location: Porcupine Plain/Saskatoon, Saskatchewan, Canada
Current Dirtbike: '03 YZ 250
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^^^^He is probably riding haha.
Interesting problem you have, sounds like perhaps a warm up issue, I let mine run for about 5-10 minutes before riding. I had a fouling issue and was mixing at 32:1, but have since cut it back to 40:1 and let it warm up longer as I mentioned before and haven't had a problem since.
'03 YZ 250
Tag bar clamps, titanium 200 foot pegs, Rental American Addition bars, RG3 suspenion, Hotwheels graphics, Griper seat cover, and Carlsbad tires.
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June 10th 2010 at 7:41 PM
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zdawg
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Im running supreme gas, not sure of the octane level but its the highest i can get around here. A couple days ago when i was riding with my friends if i would even stop for 5 seconds to talk to them and pull in the clutch it would cut out. Usually if i let it warm up for too long ill foul a plug as soon as i take off. Also, the jets are not exactly the same, theyre not made by honda or keihin but they are made for my carb.
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June 10th 2010 at 9:30 PM
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MX4life
lovin' the 2 stroke
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Location: Oshawa, Ontario, Canada
Current Dirtbike: 02 CR250/86 XR100
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Try mixing at 40:1 and see what happens. I had a problem with my bike fouling plugs too until i switched to synthetic oil and started mixing at 40:1, havent had any problems since.
2002 Honda CR250R
1986 Honda XR100R
2002 Honda CR125R(SOLD)
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June 11th 2010 at 12:24 AM
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Kawi_Rider_316
Team Not Even Scared
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632 Posts
Group: Members
Member Since: July 11th 2008
Location: Ocheyedan, Ia, USA
Current Dirtbike: Kx 250F
Race Number: 316
Sponsors: Spencer Motorsports
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I would say its most likely something with the carburator. The octane your running wont matter as much just make sure your not using any ethanol, like around here i think 89 has ethonal in it or somthing not sure about up there. Are the carb's the same number though? And did you change your needle or anything? The gas might be a problem, try mixing 40:1 but im thinking its very likely something with your carburator.
"Jump for show, Corner for dough"
"In ball and stick sports they give you the balls, In Motocross you have to bring your own"
Sponsors:
Glens Sport Center, FC MODS, MSR, Sunline, Tag, Filtron, Six Six One, Steel Mx, Dunlop,
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June 11th 2010 at 11:50 AM
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Dekk
Above Average Member
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665 Posts
Group: Members
Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
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June 11th 2010 at 2:06 PM
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Savage-CR
Savage
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153 Posts
Group: Members
Member Since: November 26th 2009
Current Dirtbike: I change this too much
Sponsors: Tosca Banquet Hall
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The pilot jet could be too rich. Was it always fouling plugs or just after you rebuilt the carb?
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June 11th 2010 at 4:09 PM
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Kawi_Rider_316
Team Not Even Scared
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632 Posts
Group: Members
Member Since: July 11th 2008
Location: Ocheyedan, Ia, USA
Current Dirtbike: Kx 250F
Race Number: 316
Sponsors: Spencer Motorsports
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Actually i think Mx went to colorado for a week or somthing. So with out him...
1st question like Savage said was it fouling plugs before you worked on the carb?
If it wasn't it is obviously something with the carburator. Why did you change the jets in the first place? If it was fouling plugs then try mixing it 40:1.
"Jump for show, Corner for dough"
"In ball and stick sports they give you the balls, In Motocross you have to bring your own"
Sponsors:
Glens Sport Center, FC MODS, MSR, Sunline, Tag, Filtron, Six Six One, Steel Mx, Dunlop,
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June 11th 2010 at 5:04 PM
[ Modified June 11th 2010 at 5:07 PM
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zdawg
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69 Posts
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Okay, the bike was not fouling plugs at all and then one day it cut out and wouldnt start. I knew it wasnt the motor because the compression was fine, so i put in a new plug and it would die after about half an hour. We took it to the honda dealership and they said there were parts in the carb that were extremely worn. We got them ordered in and they fixed it and it worked fine for a while after, until i started constantly ruining plugs again, except way more frequently. Im thinking that it just needs to be leaned out but im also wondering if they screwed something up. I thought 85s were supposed to be ran 32:1? My friend mixes his gas for his yz85 the same as me and hasnt had a problem.
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June 11th 2010 at 6:13 PM
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Kawi_Rider_316
Team Not Even Scared
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632 Posts
Group: Members
Member Since: July 11th 2008
Location: Ocheyedan, Ia, USA
Current Dirtbike: Kx 250F
Race Number: 316
Sponsors: Spencer Motorsports
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Yes 85's are "supposed" to be ran 32:1 according to manufacturer, but most people run 85's and most other 2-stroke bikes at 40:1. The manufacturer recomends the 32:1 so you have more oil than you really need just to be on the safe side. I would say put a new plug in and mix your gas 40:1 and let us know if its any better. Make sure you let it warm up but dont just let it idle, rev it up some, but not obnoxiously. If it runs better it was probley just rich, if not its most likely your carb. Personally, I'm kinda thinkin its your carb but try the gas mixture first.
"Jump for show, Corner for dough"
"In ball and stick sports they give you the balls, In Motocross you have to bring your own"
Sponsors:
Glens Sport Center, FC MODS, MSR, Sunline, Tag, Filtron, Six Six One, Steel Mx, Dunlop,
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June 11th 2010 at 6:16 PM
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MX86
What's this button do?
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757 Posts 
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Location: Nashwauk, MN, USA
Current Dirtbike: 2006 Yamaha yz250
Race Number: 86
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I leave for Colorado on thursday, just been a busy week at work.
Anywho, The first thing i would go after is the compression. Double check it just to make sure.
Next i would get a voltage (ohm meter) and check the voltage coming from the stator.
Next i would check and make sure a reed pedal is not cracked or chipped
make sure all jets are clean and the floats are set correctly
and a 85 should NEVER be run leaner then 32:1 i'd actually recommend 24:1 due to how strung those motors have to run to produce power.
Try those and let me know what you come up with, of course vids and pics are always better for helping diagnose problems.
Living Life 1 berm at a time.
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June 11th 2010 at 10:24 PM
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zdawg
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Quote originally posted by MX86
I leave for Colorado on thursday, just been a busy week at work.
Anywho, The first thing i would go after is the compression. Double check it just to make sure.
Next i would get a voltage (ohm meter) and check the voltage coming from the stator.
Next i would check and make sure a reed pedal is not cracked or chipped
make sure all jets are clean and the floats are set correctly
and a 85 should NEVER be run leaner then 32:1 i'd actually recommend 24:1 due to how strung those motors have to run to produce power.
Try those and let me know what you come up with, of course vids and pics are always better for helping diagnose problems.
Why would low compression or reeds affect my plugs? Just wondering. And to check the reeds do i just pull off the carb and unbolt it?
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June 11th 2010 at 10:46 PM
[ Modified June 11th 2010 at 10:46 PM
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MX86
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757 Posts
Group: Moderators
Member Since: June 5th 2008
Location: Nashwauk, MN, USA
Current Dirtbike: 2006 Yamaha yz250
Race Number: 86
Sponsors: X-Brand, Gravity Worx
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Quote originally posted by zdawg Quote originally posted by MX86 I leave for Colorado on thursday, just been a busy week at work. Anywho, The first thing i would go after is the compression. Double check it just to make sure. Next i would get a voltage (ohm meter) and check the voltage coming from the stator. Next i would check and make sure a reed pedal is not cracked or chipped make sure all jets are clean and the floats are set correctly and a 85 should NEVER be run leaner then 32:1 i'd actually recommend 24:1 due to how strung those motors have to run to produce power. Try those and let me know what you come up with, of course vids and pics are always better for helping diagnose problems. Why would low compression or reeds affect my plugs? Just wondering. And to check the reeds do i just pull off the carb and unbolt it? Low compression will not compress the fuel enough to get a full burn, thus leaving unburnt residue on the plug or "fouling out" Reeds open and close allowing fuel in as the pressure changes in the cases, cracked reed or broken reed will not seal the case and thus fuel will be delivered in many ways that are undesirable, which could lead to a lean or rich topend depending on throttle position and RPM speed and yes to check the reeds the carb has to be removed from the reed block/intake boot
Living Life 1 berm at a time.
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