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Old 07-10-2018, 09:13 AM
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Default Crf450r water in vent hose

     

Hi guys,
I have a 2014 crf450r and it has the vent hose that have plugs in the end. So recently Iíve been popping the plug out of the vent hose that comes from the crankcase and it has water built up in it. I tore the whole top end apart and everything looked great however there was some gunk in the vapor catch plate that is mounted on the top of the cylinder head cover. I cleaned it all out, threw in a new plug and fresh oil and I am still having some water build up in the vent hose. The bike still runs like a champ though. Any input would be greatly appreciated. Thanks!!!
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Old 07-10-2018, 11:14 AM
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Which vent hose?
Are you sure it is water? If so, it could just be condensation.

Paw Paw
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Old 07-10-2018, 01:33 PM
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The hose vents from the cylinder head cover. It definitely appears to be water but I am not 100% sure. It might be normal on bikes but the crf has the plug so it catches whatever comes out of there and Iíve drained what appears to be a few ounces of water a couple times even after an oil change. I havenít ridden it that much though so maybe it will go away after another oil change or two

---------- Post added at 03:29 PM ---------- Previous post was at 01:42 PM ----------

Sorry I don’t know why I said crankcase, I just realized that. It is the vent hose that comes out of the top of the engine, out of the the cylinder head cover.

---------- Post added at 03:33 PM ---------- Previous post was at 03:29 PM ----------

97cr250's Library | Photobucket

Above I should a link to my photobucket. If anyone cares to look I posted a picture of a crf engine with the hose on it that I am talking about as well as my engine in my bike you can see the hose is a little cloudy from the water sitting in it
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Old 07-10-2018, 02:16 PM
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My earlier model CRF450R has the same hose, but after a "Y" connector in the hose it runs back into the air filter box inside the air filter. the other end does go down at the back of the engine and is plugged. This routing is the breather tube that vents engine oil vapors back into the intake air to be burnt as well as a catch hose for the condensation from when the oil cools in that line. Just drain it from time to time. All is good as long as it has that "Y" fitting in the line.
My Husky 450 also has the same feature.
Did a previous owner maybe chance this and then plug it?
With no "Y" in the line you will be building up excess pressure in the engine and it needs to be vented.
You can go to any OEM parts vendor on line as see this hose set up.

Paw Paw

Last edited by PawPaw; 07-10-2018 at 02:24 PM.
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Old 07-10-2018, 02:45 PM
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There is a Y and it does reroute into the air box so I will just monitor it like you said. The plug is clearly done from the factory not rigged up so itís the way it should be. Thanks for the input PawPaw I appreciate it!
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