breather?

WELLS · April 21st, 2010, 06:38 PM

First off, great forum. I have turned a simple project on my 07 250 into a large one. My issue is with my airbox removal. I'm sure it has already been discussed, and I tried to find it so please bear with me. My concern is with the crankcase breather tube that originally ran to the bottom of the airbox, in the past after long rides I have noticed small amounts of oil in the box from this tube. What is the proper way to allow this tube to vent while keeping oil from " leaking " or ending up on the motor. Thanks.
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drstimpy · April 21st, 2010, 07:05 PM

put a cute little breather filter on the end of it...looks like a mini k and n filter. I have actually wondered if I could route it to my chain and have a low tech auto oiler???

2WheelGuy · April 21st, 2010, 07:06 PM

Some people attach a small K&N filter to the crankcase breather outlet.

I prefer the racer method of attaching a small bottle to the frame and running a tube from the crankcase into it. My racing organization (AFM) requires a minimum 6 ounce clear bottle. Most racers use either a baby bottle or a bear shaped honey bottle with a Zip-Tie around its neck. Since you have removed the airbox their is plenty of space to find room for a small bottle.

WELLS · April 21st, 2010, 07:15 PM

Quote:

Originally Posted by 2WheelGuy

Some people attach a small K&N filter to the crankcase breather outlet.
I
I prefer the racer method of attaching a small bottle to the frame and running a tube from the crankcase into it. My racing organization (AFM) requires a minimum 6 ounce clear bottle. Most racers use either a baby bottle or a bear shaped honey bottle with a Zip-Tie around its neck. Since you have removed the airbox their is plenty of space to find room for a small bottle.

Thanks, that was my concern on running an open crankcase breather filter in that there was nothing to capture the oil. Does this catch can need to be able to return? Should it be vented?
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greg737 · April 21st, 2010, 07:44 PM

Quote:

Originally Posted by WELLS

Thanks, that was my concern on running an open crankcase breather filter in that there was nothing to capture the oil. Does this catch can need to be able to return? Should it be vented?
Posted via Mobile Device

I think it should be vented. It was vented in it's original configuration (when it was attached to the air box).

I was thinking that a small model airplane fuel tank would do the job nicely. They come in all shapes and sizes. They are "fuel safe" if you make sure you buy one meant for gasoline type fuels (as opposed to methanol or oil/nitro mixture). Most of them are set up with two tubes so you could use one as the crankcase breather tube and the other could be the vent tube. You could hang it downward with the other vent tubes the EX-250 already has.

Snake · April 22nd, 2010, 07:00 AM

Quote:

Originally Posted by greg737

I think it should be vented. It was vented in it's original configuration (when it was attached to the air box).

I was thinking that a small model airplane fuel tank would do the job nicely. They come in all shapes and sizes. They are "fuel safe" if you make sure you buy one meant for gasoline type fuels (as opposed to methanol or oil/nitro mixture). Most of them are set up with two tubes so you could use one as the crankcase breather tube and the other could be the vent tube. You could hang it downward with the other vent tubes the EX-250 already has.

This just keeps getting better and better. I love your idea about using the model airplane fuel tank.

2WheelGuy · April 22nd, 2010, 07:12 AM

Quote:

Originally Posted by WELLS

Thanks, that was my concern on running an open crankcase breather filter in that there was nothing to capture the oil. Does this catch can need to be able to return? Should it be vented?
Posted via Mobile Device

It does not need a return. I've ridden for years with only a tiny amount of oil accumulating in the catch. Yes, it does need to be vented.

WELLS · April 22nd, 2010, 07:49 AM

Thanks for all the help, I will let you all know how it goes
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HotWheels · April 27th, 2010, 07:49 AM

The first one is what I am using and it works great. Most auto parts stores will have at least one or the other on hand.

http://www.purolatorautofilters.net/...partnum=B23124

http://www.amazon.com/Fram-BA3749-FR.../dp/B000A09KM4

2WheelGuy · April 27th, 2010, 08:03 AM

Photos of my setup:

April 21st, 2010, 06:38 PM	#1
WELLS ninjette.org member Name: WELLS Location: NEWNAN, GA. Join Date: Apr 2010 Motorcycle(s): 07 250R Posts: 10	breather? First off, great forum. I have turned a simple project on my 07 250 into a large one. My issue is with my airbox removal. I'm sure it has already been discussed, and I tried to find it so please bear with me. My concern is with the crankcase breather tube that originally ran to the bottom of the airbox, in the past after long rides I have noticed small amounts of oil in the box from this tube. What is the proper way to allow this tube to vent while keeping oil from " leaking " or ending up on the motor. Thanks. Posted via Mobile Device

April 21st, 2010, 07:05 PM	#2
drstimpy two wheels good Name: john Location: Wareham MA Join Date: Mar 2010 Motorcycle(s): 04 ex250 and 08 Triumph Sprint ST and custom calfee carbon race tandem Posts: 71	put a cute little breather filter on the end of it...looks like a mini k and n filter. I have actually wondered if I could route it to my chain and have a low tech auto oiler??? __________________________________________________ Some must watch while others must sleep

April 21st, 2010, 07:06 PM	#3
2WheelGuy ninjette.org certified postwhore Name: Craig Location: Silicon Valley, CA USA Join Date: May 2009 Motorcycle(s): '98 EX250, '02 EX250, '08 250r, '03 SV650, '98 GSXR750 '03 Hayabusa, '87 YSR50, '84 ZX900, +MORE Posts: A lot.	Some people attach a small K&N filter to the crankcase breather outlet. I prefer the racer method of attaching a small bottle to the frame and running a tube from the crankcase into it. My racing organization (AFM) requires a minimum 6 ounce clear bottle. Most racers use either a baby bottle or a bear shaped honey bottle with a Zip-Tie around its neck. Since you have removed the airbox their is plenty of space to find room for a small bottle. __________________________________________________ CraigHarris.org Pacific Track Time CraigsWeb See you at 2014 MotoGP Laguna Seca! We'll be camping on Fox Hill. AFM #278

April 27th, 2010, 07:49 AM	#9
HotWheels ninjette.org member Name: Brandon Location: San Luis Obispo Ca. Join Date: Feb 2010 Motorcycle(s): EX 250 Posts: 24	Use filters like these The first one is what I am using and it works great. Most auto parts stores will have at least one or the other on hand. http://www.purolatorautofilters.net/...partnum=B23124 http://www.amazon.com/Fram-BA3749-FR.../dp/B000A09KM4

April 27th, 2010, 08:03 AM	#10
2WheelGuy ninjette.org certified postwhore Name: Craig Location: Silicon Valley, CA USA Join Date: May 2009 Motorcycle(s): '98 EX250, '02 EX250, '08 250r, '03 SV650, '98 GSXR750 '03 Hayabusa, '87 YSR50, '84 ZX900, +MORE Posts: A lot.	Photos of my setup: __________________________________________________ CraigHarris.org Pacific Track Time CraigsWeb See you at 2014 MotoGP Laguna Seca! We'll be camping on Fox Hill. AFM #278

April 22nd, 2010, 07:49 AM	#8
WELLS ninjette.org member Name: WELLS Location: NEWNAN, GA. Join Date: Apr 2010 Motorcycle(s): 07 250R Posts: 10	Thanks for all the help, I will let you all know how it goes Posted via Mobile Device

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