Oil in Air Filter Box - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum

bloodyrancher · 09-09-2010, 11:27 PM

Need help! I have an 06 Rancher with 180 miles on it. The hose that is comming from the engine block into the air filter box is blowing oil out of it and that is clogging up my air filter and thus the engine cant breath and will not run. The oil level is correct, the bike sat over the winter but was crancked every month but maybe one or two. when I remove the air filter the bike will run, but the hose still blows oil out. I have cleaned the air filter, but it quickly coats wilt oil when the engine runs. Any suggestions on trouble shooting/repair needs. Like I stated the bike did sit for a couple months the oil level is correct, but have no idea on what could be causing the problem...any help is greatly appreciated.

foreman480 · 09-10-2010, 12:33 AM

never heard of that before.... have you flipped it lately? lol

2003 foreman es · 09-10-2010, 07:33 AM

The only time I've heard or seen that was when the oil level was too high, but you stated the level is correct.... Gonna have to do some investigation.

red08420 · 09-10-2010, 08:40 AM

That's the crankcase vent line. When you have blow by around the piston it pressurizes the crankcase. Without that vent the bottom end seals would be blown out. The line is vented back into the incoming air b/c it is more environmentally friendly to reburn the partially burnt exhaust gases and oil that come out. That's what the PCV valve does on your vehicle. For some reason deisels are not regulated and you will often see a "slober tube" about the size of a garden hose hanging down in front of the front axle with a little exhaust and oil coming out.

I just cleaned my airbox and changed my filter yesterday after using it from 0-146 hours over the last 18 months. The bottom 1/8 of my filter was saturated in oil, probably a combo of a little filter oil drainage and some engine oil. I considered it perfectly healthy.

Is your saturation worse than this?

Why do you think your running problem is related to this?
-Can you see or smell burnt oil from the exhaust?
-Is your carb/intake coated in oil?
-Does your plug look fouled/dark/have build up?

The way you've described it, it seems like the oil is def the problem, just wondering (hoping) it could be a carb problem for your sake.

It seems strange for such a new bike to have excessive blow by, only 180mi, mine has 800mi easily. I'm gonna guess your rings are stuck from sitting and won't expand out to seal the cylinder, resulting in excessive blow by. But it could be something more simple, just a slightly educated wild ass guess. Before tearing it down maybe you could try some snake oil like sea foam or something. Something that says it "frees sticking rings" and "restores compression".

Come to think of it, you could do a compression test. It should have perfect compression @ 180 mi, unless you powerbraked it in one spot and did a 180 mile burn out. LOL

**toodeep** · 09-10-2010, 09:22 AM

I have ran across a few 350 Ranchers that you had to run the oil level 1/2 between the marks on the stick and it will no longer do this. The type/weight of oil being used could also contribute to this. Are you checking the oil after you let it idle a few minutes and then let it sit a few minutes? It could be blow by but I would try running it between the marks first.

yellowsubmarine(cb) · 09-19-2010, 11:47 PM

riding wheelies will cause the oil to run in crankcase vent to airbox also, just in case u like to ride on the rear wheels!

bloodyrancher · 09-21-2010, 06:51 PM

Well, I dropped the oil drain plug to drop the oil level, and to my suprise it was very thin and smelled like gasoline. I drained it all out, and now I think I may have a big problem. I have no idea what would cause this, any ideas?

RUMlover · 09-21-2010, 08:35 PM

I have seen this on a yami kodiak before. If I remember correctly, the float in the carb was stuck(or the gas tank vent line was clogged....dont remember.) causing gas to fill the airbox and then flow through the crankcase vent line and into the oil during storage. This raised the oil level which would cause the oil/gas mixture to blow back into the airbox.
Hope this helps.

Gauntlet3D · 09-22-2010, 09:38 AM

X2 Change your oil a couple times. clean your carb a few times. When you store the bike shut the fuel off. Don't run the bike until you change the oil.

bloodyrancher · 09-25-2010, 05:45 PM

Changed the oil, cleaned filter, etc. all is well for now....keepin my fingers crossed...thanks for all the help!

09-09-2010, 11:27 PM	#1 (permalink)
bloodyrancher Honda Rider Join Date: Dec 2009 Posts: 10	Oil in Air Filter Box Need help! I have an 06 Rancher with 180 miles on it. The hose that is comming from the engine block into the air filter box is blowing oil out of it and that is clogging up my air filter and thus the engine cant breath and will not run. The oil level is correct, the bike sat over the winter but was crancked every month but maybe one or two. when I remove the air filter the bike will run, but the hose still blows oil out. I have cleaned the air filter, but it quickly coats wilt oil when the engine runs. Any suggestions on trouble shooting/repair needs. Like I stated the bike did sit for a couple months the oil level is correct, but have no idea on what could be causing the problem...any help is greatly appreciated.

09-10-2010, 12:33 AM	#2 (permalink)
foreman480 Honda Rider Join Date: Aug 2010 Location: Williamson Posts: 71	never heard of that before.... have you flipped it lately? lol __________________ '95 foreman 480---SOLD! looking for the next one might have to go to the dark side (non honda)

09-10-2010, 07:33 AM	#3 (permalink)
2003 foreman es Honda Red Wing Rider Join Date: Dec 2009 Location: The Motor City Posts: 3,687	The only time I've heard or seen that was when the oil level was too high, but you stated the level is correct.... Gonna have to do some investigation. __________________ 03 Foreman ES Too much to list...

09-10-2010, 08:40 AM	#4 (permalink)
red08420 Honda Addict Join Date: Mar 2010 Posts: 236	That's the crankcase vent line. When you have blow by around the piston it pressurizes the crankcase. Without that vent the bottom end seals would be blown out. The line is vented back into the incoming air b/c it is more environmentally friendly to reburn the partially burnt exhaust gases and oil that come out. That's what the PCV valve does on your vehicle. For some reason deisels are not regulated and you will often see a "slober tube" about the size of a garden hose hanging down in front of the front axle with a little exhaust and oil coming out. I just cleaned my airbox and changed my filter yesterday after using it from 0-146 hours over the last 18 months. The bottom 1/8 of my filter was saturated in oil, probably a combo of a little filter oil drainage and some engine oil. I considered it perfectly healthy. Is your saturation worse than this? Why do you think your running problem is related to this? -Can you see or smell burnt oil from the exhaust? -Is your carb/intake coated in oil? -Does your plug look fouled/dark/have build up? The way you've described it, it seems like the oil is def the problem, just wondering (hoping) it could be a carb problem for your sake. It seems strange for such a new bike to have excessive blow by, only 180mi, mine has 800mi easily. I'm gonna guess your rings are stuck from sitting and won't expand out to seal the cylinder, resulting in excessive blow by. But it could be something more simple, just a slightly educated wild ass guess. Before tearing it down maybe you could try some snake oil like sea foam or something. Something that says it "frees sticking rings" and "restores compression". Come to think of it, you could do a compression test. It should have perfect compression @ 180 mi, unless you powerbraked it in one spot and did a 180 mile burn out. LOL __________________ 2008 TRX 420 FM -winch -auxiliary front and rear lights -dog water and bowl -chainsaw 2003 TRX 400 EX -Full aluminum skidplates, nerfs, bumpers -Pro Taper bars & clamps, G2 handguards -Supersprox sprockets, gold RK -Razrs Last edited by red08420; 09-10-2010 at 08:48 AM.

09-19-2010, 11:47 PM	#6 (permalink)
yellowsubmarine(cb) Honda Addict Join Date: Apr 2007 Location: Kershaw SC Posts: 176	riding wheelies will cause the oil to run in crankcase vent to airbox also, just in case u like to ride on the rear wheels! __________________ 04 Foreman 450 ES w/30" S-Backs, ITP SS 312 Wheels, Highlifter 475cc BBK, WebCam cam, 14% Gear Reduction, EPI Clutch Kit, DGL, HL 2"Lift, HL Springs, HMF Utility Exhaust & jet, Triangle ATV Snorkle, K&N w/Outterwears pre-filter, Gorilla 3k lb winch, HL Diamond Plate Bash Plate & Axle Guards, Custom Audio Pipe w/ Polk Marine Speakers, Custom Fuel Guage Light, Headlight Lifted, 8000k HID Lights, Manual Fan Switch, Rear Utility Light, Xtreme Disc Brake Conv

09-10-2010, 09:22 AM	#5 (permalink)
toodeep Administrator Join Date: Aug 2007 Location: south dakota Posts: 6,427	I have ran across a few 350 Ranchers that you had to run the oil level 1/2 between the marks on the stick and it will no longer do this. The type/weight of oil being used could also contribute to this. Are you checking the oil after you let it idle a few minutes and then let it sit a few minutes? It could be blow by but I would try running it between the marks first.

09-21-2010, 06:51 PM	#7 (permalink)
bloodyrancher Honda Rider Join Date: Dec 2009 Posts: 10	rancher problems Well, I dropped the oil drain plug to drop the oil level, and to my suprise it was very thin and smelled like gasoline. I drained it all out, and now I think I may have a big problem. I have no idea what would cause this, any ideas?

09-21-2010, 08:35 PM	#8 (permalink)
RUMlover Honda Rider Join Date: Aug 2010 Posts: 38	I have seen this on a yami kodiak before. If I remember correctly, the float in the carb was stuck(or the gas tank vent line was clogged....dont remember.) causing gas to fill the airbox and then flow through the crankcase vent line and into the oil during storage. This raised the oil level which would cause the oil/gas mixture to blow back into the airbox. Hope this helps.

09-22-2010, 09:38 AM	#9 (permalink)
Gauntlet3D Honda Red Wing Rider Join Date: May 2010 Location: Upstate NY Posts: 1,105	X2 Change your oil a couple times. clean your carb a few times. When you store the bike shut the fuel off. Don't run the bike until you change the oil. __________________ 2009 Rubicon Black 350 Miles 2500lbs Warn ITP 212 Machined SS Rims 27" Maxxis Zillas 2" Gorilla Lift Richocett Swing Arm Skid Plate 2" Snorkle HMF Swamp Series UniFilter Rejet Custom Speaker Box Powermadd Black Hand Guards Ammo cans 2007 Rancher ES Red 750 Miles ITP 108 Machined SS Rims Rubicon stock tires Powermadd Black Hand Guards 2 Up Rear Box

09-25-2010, 05:45 PM	#10 (permalink)
bloodyrancher Honda Rider Join Date: Dec 2009 Posts: 10	oil problem Changed the oil, cleaned filter, etc. all is well for now....keepin my fingers crossed...thanks for all the help!

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