oil in the airbox - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 13 (permalink) Old 05-07-2007, 09:40 PM Thread Starter
 
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oil in the airbox

i was changing my sparkplugs and while i was taking the air filter out i noticed that there was a small amount of oil in there(like a tablespoon). could this be a vacuum hose or pcv valve?

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2000 yamaha r6
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post #2 of 13 (permalink) Old 05-07-2007, 10:19 PM
 
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Not sure on that, If the valve cover is like a honda car, it might be the valve cover gasket, How far do the plugs go down in the valve cover?

Got any pics?
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post #3 of 13 (permalink) Old 05-07-2007, 10:20 PM
 
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erm, i read the message wrong, you ment in the air filter..


pcv valve possibly
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post #4 of 13 (permalink) Old 05-07-2007, 10:34 PM
 
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Its an accumulation of oil mist from the crankcase. A small amount of piston blow-by pushes it in there. Eventually, it will affect the breathability of your air filter. but fairly normal if you like to wind up those RPM's...
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post #5 of 13 (permalink) Old 05-08-2007, 10:19 AM
 
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However the PCV vale is suppost to stop this from happening. If it has one it may be bad. Or you have excessive amount of blow-by. This can be checked by putting you hane over the oil fill hole while the engine is running. If it blows past your hand, you have too much blow-by and bad rings. Find the PCV vale and remove it. (If it has one) Shake it to test, it should rattle in your hand.
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post #6 of 13 (permalink) Old 05-08-2007, 08:19 PM Thread Starter
 
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after doing a search i read that bikes dont have pcv's
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post #7 of 13 (permalink) Old 05-09-2007, 09:57 AM
 
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My 85 Interceptor did. But I'm not sure if newer bikes do or not.
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post #8 of 13 (permalink) Old 05-09-2007, 04:45 PM
 
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i dont know your bike, but it sounds like just the crank case breather. Look at the hoses attached the air box... one feed the engine case?
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post #9 of 13 (permalink) Old 05-10-2007, 09:44 PM
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Bikes don't have no pcvs...

It is from excessive crankcase and head pressure on the top end. The govt makes the bike manufactures "re-burn" that oil mist into the air box or intake. I bet there was a tube coming from the motor into the airbox...




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post #10 of 13 (permalink) Old 05-11-2007, 09:59 AM
 
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I did some reserch on my CBR. You are right there is no PCV valve per say. There is a check valve on the valve cover that stops fluid from entering the airbox to be burned. Like a pcv valve does.
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post #11 of 13 (permalink) Old 05-11-2007, 01:24 PM
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Well in that case... remove it and blow thru it... see if it flows in the correct direction and not in reverse...




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post #12 of 13 (permalink) Old 05-11-2007, 01:47 PM
 
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california models have an extra canister and plumming. i had one once. it was easy to remove. but the oil in the air box is somewhat normal. how many miles are on the bike?

-a|ex
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post #13 of 13 (permalink) Old 05-11-2007, 08:28 PM
 
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That is right. Cali models have to have an evap. emissions system for fuel vapor. Part of what is in the air box could be condensed fuel and oil vapor.
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