05 ninja 250 leaking oil

sedorbrian · 07-02-2009, 04:04 PM

I am having a little trouble locating the leak. The oil accumulates on top of the case, kinda below the carburetor. The underside of the plastic air box is wet, and dripping onto the case, shock, and down to the ground.

hybrid · 07-02-2009, 07:59 PM

Id bet its the valve cover gasket and the wind is spraying the airbox and then dripping down.

Clean the engine really well with soap and water and spray foot powder on the engine, drive around the block 4 or 5 times and look again. Spray foot powder sticks to the engine and will let you trace the source of the leak.

sedorbrian · 07-04-2009, 03:50 PM

I cleaned it up very well to see where the oil is coming from. Its not coming from the valve cover gasket. It seems as though it is coming from the plastic air box itself?!? I tightened the screws where the air box splits, and it still leaks. Its leaking pretty good too, i ran to get gas down the road and theres probably about a tablespoon. The whole bottom of the air box is wet where it splits, and its running down and dripping off the lowest part of the box.

sedorbrian · 07-04-2009, 06:54 PM

Picture.jpg picture by sedorbrian - Photobucket

I found where its coming from. Theres a pic ^. I dont know what this is, if theres supposed to be a hose going to it or what. Its bubbling/splashing from this.

sedorbrian · 07-04-2009, 08:10 PM

unless oil is just dripping in there and vibrating out when i rev it... : / If thats the case, then it must be coming from the air box. After running it for a little while, oil will drip out of the little hose with the plug in it that comes out of the airbox, if i unplug it.

sedorbrian · 07-04-2009, 08:55 PM

unless oil is just dripping in there and vibrating out when i rev it... : /

snlsmith · 07-05-2009, 12:58 PM

Did you just do an oil change? Chances are you have too much oil in there. There is what is basically an overflow valve that goes to the airbox. If the oil pressure is too high (due to too much oil, and then expansion from heat). The oil then drips out of the drainage hole in the airbox. Pull out your oil filter and you will find a small puddle of oil in there, as well as you air filter having a nice coating on it. To fix the problem, drain your oil into a clean container, then refill only until it gets to the correct level on the site glass.

sedorbrian · 07-06-2009, 01:45 PM

i drained some oil out. but i still dont know what that little thing is that i took a picture of. Is it a breather missing a cap? or is it just nothing?

sedorbrian · 07-06-2009, 02:41 PM

T_Blaze · 07-06-2009, 02:58 PM

Quote:

Originally Posted by sedorbrian

IF you still have the airbox, there is a hose that connects crankcase vent to airbox. If you do not have an airbox, put a filter on there.

What do I do with the crankcase vent hose? - Ninja250Wiki

Make sure you have the right amount of oil in the bike. the bike should be on both wheel (not on center stand) upright. Check the level through the sight glass. It should not be above marker to the left of the glass.

Good luck