Oil in airbox!?

Audihuff · 04-10-2019, 05:12 PM

So i was putting in a new filter that came in a kit for my i got from nzbrake.. and i saw a puddle of oil sitting in the bottom of the airbox! bike runs fine.. what could cause this? i know i put a little too much oil in there my last oil change but i didnt think it would wind up in the airbox.. help lol

wheel spinner · 04-10-2019, 05:19 PM

There ya go... too much oil.... drain some and recheck oil level ...

Megadan · 04-10-2019, 11:30 PM

It is going to happen regardless of oil level, but too much oil can exacerbate the issue. All crankcase breather systems end up with a little oil in them as some of the oil gets turned into essentially a mist that condenses on whatever it comes in contact with.

Take that and combine it with a breather tube that makes a 90 degree bend and runs flat to the airbox and that amplifies the issue.

There are a few tips and tricks out there to help alleviate the problem. Simple airbox modifications, PCV valves, etc. I have a breather filter on the end of a hose mounted more vertically with a small oil/water separator from harbor freight mounted between the engine and said filter. An idea I borrowed from the Grom guys.

Audihuff · 04-11-2019, 10:45 AM

thank you guys! could the oil in the airbox also cause it to sputter full throttle?

Megadan · 04-11-2019, 10:47 AM

Quote:

Originally Posted by Audihuff

thank you guys! could the oil in the airbox also cause it to sputter full throttle?

Only if the paper filter got oil soaked, which would reduce its ability to pass air through it.

Audihuff · 04-11-2019, 10:58 AM

it was dripping wet! there was about 1/2 a cup of oil in the bottom! i appreciate the help megadan! i just subscribed to oddballproformance as well!!

timcosby · 04-11-2019, 09:14 PM

there is a cover that goes on the diamond shaped part there in the bottom on the right side. chinaman decided we really didnt need it so it wasnt included. the cover keeps it contained and makes it change direct a couple times so the mist hits the side walls so that it doesnt make it to the filter. simple to make. takes one small screw and a hole in it to go over the small post. the post is there for a reason so dont cut it off as some did. once the screw is in the hole the cover cant come up high enough to get over the post. a lot of oil like that is usually from overfilling as per the manual 1.6 quarts! wrong!! 1 quart will do ya.

**JerryHawk250** · 04-12-2019, 07:58 AM

Quote:

Originally Posted by timcosby

there is a cover that goes on the diamond shaped part there in the bottom on the right side. chinaman decided we really didnt need it so it wasnt included. the cover keeps it contained and makes it change direct a couple times so the mist hits the side walls so that it doesnt make it to the filter. simple to make. takes one small screw and a hole in it to go over the small post. the post is there for a reason so dont cut it off as some did. once the screw is in the hole the cover cant come up high enough to get over the post. a lot of oil like that is usually from overfilling as per the manual 1.6 quarts! wrong!! 1 quart will do ya.

And sense Tim is so dang lazy I went and found his thread on it.

http://www.chinariders.net/showthread.php?t=18629

AresROC · 09-17-2019, 07:36 PM

I keep seeing people posting water in their airbox. I live in the desert but I am surprised to see my Bashan's crank case ventilation filled with water/oil also. Got a good view of it with my swingarm off.

1. Crank case
2. Air box
3. Clear tube filled with liquid

Do I need to drain this thing it looks pretty filled after ~500 miles.

Guess there is already info on this! OCS http://www.chinariders.net/showthread.php?t=16518

OneLeggedRider · 09-17-2019, 09:11 PM

My Hawk doesn't have an issue with this, at all. But Jay's TBR7 does badly, even after just a 4 hour ride. But this isn't my first rodeo. I would find a longer hose and route it straight up to the top of the frame, zip tie it there and then run it back down to the airbox. I'm not guaranteeing this will stop everything, but it will be much better than the stock horizontal line.

AresROC · 09-18-2019, 02:54 AM

After much soul struggle... I ended up with... CSC's Oil Contaminant Separator (OCS) setup.

Plan A was to use the extra secondary air injection tube and run crank case vent up and then down into airbox. There is an easily accessible drain under the OEM airbox.

Plan B was to leave as is and there should be less fluid collection in the clear tube.

Plan C is to correct the OCS orientation, with opening of the foam filter facing airbox. (filter shape outlined in red).

Reason to go with "C" is I had experienced increasing oil level in the crank case. Now the bike is broke in it seems to be better, but I always wondered there are gas/water condensation going into oil. I am also experiencing clutch slippage issues with Rotella T4.

When I removed the collection clear tube it was damp but empty of liquid.

I am now tuning the carb and don't need another fuel vapor variable. Also would like to avoid having combustion wastes going into the airbox/carburetor.

Downside of this setup is more maintenance work...

Upside is I have gained more knowledge from China bikes then all my previous Japanese bikes combined

NzBrakelathes · 09-18-2019, 04:27 AM

Quote:

Originally Posted by AresROC

After much soul struggle... I ended up with... CSC's Oil Contaminant Separator (OCS) setup.

Plan A was to use the extra secondary air injection tube and run crank case vent up and then down into airbox. There is an easily accessible drain under the OEM airbox.

Plan B was to leave as is and there should be less fluid collection in the clear tube.

Plan C is to correct the OCS orientation, with opening of the foam filter facing airbox. (filter shape outlined in red).

Reason to go with "C" is I had experienced increasing oil level in the crank case. Now the bike is broke in it seems to be better, but I always wondered there are gas/water condensation going into oil. I am also experiencing clutch slippage issues with Rotella T4.

When I removed the collection clear tube it was damp but empty of liquid.

I am now tuning the carb and don't need another fuel vapor variable. Also would like to avoid having combustion wastes going into the airbox/carburetor.

Downside of this setup is more maintenance work...

Upside is I have gained more knowledge from China bikes then all my previous Japanese bikes combined

The big long thing on right side lower of your photo is the air injection!?
That can be blocked off - I think that is what I see but photo unclear

04-10-2019, 05:12 PM	#1
Audihuff Join Date: Feb 2019 Location: Youngstown, OH Posts: 56	Oil in airbox!? So i was putting in a new filter that came in a kit for my i got from nzbrake.. and i saw a puddle of oil sitting in the bottom of the airbox! bike runs fine.. what could cause this? i know i put a little too much oil in there my last oil change but i didnt think it would wind up in the airbox.. help lol __________________ To light a candle, is to cast a shadow..
	0

04-10-2019, 05:19 PM	#2
wheel spinner Join Date: Nov 2017 Location: Suffolk Va. Posts: 146	There ya go... too much oil.... drain some and recheck oil level ... __________________ 2006 Roketa DB-07-200 Dual Sport 2007 Monte Carlo SS 5.3 2010 Challenger Hemi 5.7 2004 Isuzu Rodeo 1998 Kia Sportage 4x4 2004 Toyota Tundra 2016 Ford Escape Guitars 1970 Gibson SG mint Condition 2005 Epiphone white Custom SG Les Paul L/New Fender Banjo New Condition BC Rich Bitch - Like New\ 3 Jay Turser SG Good Condition Amps Marshall vs100 Good Condition Acoustic 261 very good condition Boss GT-6 Pedal effects Like New
	1

04-10-2019, 11:30 PM	#3
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,030	It is going to happen regardless of oil level, but too much oil can exacerbate the issue. All crankcase breather systems end up with a little oil in them as some of the oil gets turned into essentially a mist that condenses on whatever it comes in contact with. Take that and combine it with a breather tube that makes a 90 degree bend and runs flat to the airbox and that amplifies the issue. There are a few tips and tricks out there to help alleviate the problem. Simple airbox modifications, PCV valves, etc. I have a breather filter on the end of a hose mounted more vertically with a small oil/water separator from harbor freight mounted between the engine and said filter. An idea I borrowed from the Grom guys. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 Last edited by Megadan; 04-11-2019 at 10:45 AM.
	1

04-11-2019, 10:45 AM	#4
Audihuff Join Date: Feb 2019 Location: Youngstown, OH Posts: 56	thank you guys! could the oil in the airbox also cause it to sputter full throttle? __________________ To light a candle, is to cast a shadow..
	0

04-11-2019, 10:58 AM	#6
Audihuff Join Date: Feb 2019 Location: Youngstown, OH Posts: 56	it was dripping wet! there was about 1/2 a cup of oil in the bottom! i appreciate the help megadan! i just subscribed to oddballproformance as well!! __________________ To light a candle, is to cast a shadow..
	0

04-11-2019, 09:14 PM	#7
timcosby Join Date: Nov 2016 Location: robertsdale alabama usa Posts: 1,007	there is a cover that goes on the diamond shaped part there in the bottom on the right side. chinaman decided we really didnt need it so it wasnt included. the cover keeps it contained and makes it change direct a couple times so the mist hits the side walls so that it doesnt make it to the filter. simple to make. takes one small screw and a hole in it to go over the small post. the post is there for a reason so dont cut it off as some did. once the screw is in the hole the cover cant come up high enough to get over the post. a lot of oil like that is usually from overfilling as per the manual 1.6 quarts! wrong!! 1 quart will do ya. __________________ 1991 harley heritage softail classic 2016 hawk kaw h1 400 tripple 13' long chopper in progress 2009 johnny pag bar hog 2004 hd electra glide ultra classic shriner edition 1997 harley davidson 1200 sportster 1972 harley davidson amf sx250
	2

09-17-2019, 09:11 PM	#10
OneLeggedRider Join Date: Nov 2018 Location: Stockport, Oh. Posts: 1,442	My Hawk doesn't have an issue with this, at all. But Jay's TBR7 does badly, even after just a 4 hour ride. But this isn't my first rodeo. I would find a longer hose and route it straight up to the top of the frame, zip tie it there and then run it back down to the airbox. I'm not guaranteeing this will stop everything, but it will be much better than the stock horizontal line.
	1