Oil In Air Box
#1
Oil In Air Box
I recently bought a used KLX250sf and as one of my things to check was the air filter. Once opened the air box had UNI air filter installed and a bunch of bugs. So I decided to clean around and then i noticed the lower part of the filter was soaked in oil? As much as i tried to dry it off it was still oily,why did this happen? should I change it or just wash the filter?
#3
I recently bought a used KLX250sf and as one of my things to check was the air filter. Once opened the air box had UNI air filter installed and a bunch of bugs. So I decided to clean around and then i noticed the lower part of the filter was soaked in oil? As much as i tried to dry it off it was still oily,why did this happen? should I change it or just wash the filter?
Initially I thought it was because I put too much oil in during a recent oil change and it worked it's way up to the air filter. But then I learned the filter is suppose to be oily. I'm not sure how oily though. It seemed like the rim of my filter was pretty oily so I squeezed the excessive oil into a rag.
I just ordered a K&N filter so it will be a moot point for me soon.
#5
If you do a lot of highway riding, oil can actually come up the crankcase vent as well.
On my longer highway trips with a lot of sustained 70 mph riding, often I will find a little bit of oil at the bottom of the air box.
They all do it, nothing is wrong.
On my longer highway trips with a lot of sustained 70 mph riding, often I will find a little bit of oil at the bottom of the air box.
They all do it, nothing is wrong.
#6
I think most of the oil observed in this scenario is from the filter itself. However, depending on crankcase pressure, it's also not that unusual to have a small amount of oil aspirated into the airbox tube. So unless you're bleeding a really noticeable amount of oil into the airbox, I wouldn't worry about it too much.
#9
Very true, linkin, but if you have oil dripping out of a K&N after servicing, you probably know you have waaaaay too much oil on it. On these foam filters, even with the super tacky specialized filter oil, if you get just a little rich with the oil, gravity will usually let a little of that oil soak to the bottom of the filter and on to the airbox. If you're using motor oil or a thinner oil, you're just about guaranteed some oil to come out of the airbox. Even that thick, tacky oil can seep a little when you get full engine for awhile.
Still, it's not too unusual to get a little oil from the crankcase into the airbox tube. It should only be a little bit, however.
Still, it's not too unusual to get a little oil from the crankcase into the airbox tube. It should only be a little bit, however.
#10
Oil in Airbox klx250s
I recently bought a used KLX250sf and as one of my things to check was the air filter. Once opened the air box had UNI air filter installed and a bunch of bugs. So I decided to clean around and then i noticed the lower part of the filter was soaked in oil? As much as i tried to dry it off it was still oily,why did this happen? should I change it or just wash the filter?