oil in airbox

on my dads 94 kdx200, its not premix and he says he squeezed the filter dry enough. it smells like regular motor/tranny oil. my question is how is it getting in there and how to fix it, ill check the carb to airbox boot see if its dry

I have had close to the same issue w/my 1997 kdx which is why i have not been riding.At the carb intake was a mixture of some kind plus in the airbox at the bottom below the filter was a mixture that smelled and looked like premix.

my bike sat up for awhile and the air filter started to deterioate at the flat part that is the rim.It appears as if some of the filter had been sucked into the carb.I have cleaned and taken apart the carb about 3 times now and am finally ready to attempt to start the damn thing.AGAIN.with new filter.

hopefully someone will reply w/some pertinent info.

How is your dad's bike NOT premix?? Are you saying that there is oil in the airbox, but it is not premix??

Way too much oil on the filter could pool up.

i dont know how tranny oil would get in the airbox unless you re-routed the crank breather in there.....

In stock form, the crankcase breather DOES run into the airbox.

yeah the boot was dry (as they get), so if the breather does run in there what would make oil come out besides overfilling it

and kdx, you know what i mean the oil in the airbox isnt premix (smells way different)

In stock form, the crankcase breather DOES run into the airbox.

really, well thats likely what it is then. Generally oil comes out the breather tube when the engine gets really hot, or it is overfilled, it allows it to squirt out the extra oil to protect the engine

it is fairly easy to overfill the trans oil if you don't leave the machine standing straight up long enough

some Kawi 2 strokes have fairly small passages between clutch and trans areas and take several minutes vertical to get proper reading in sight glass

I have a friend who had a KDX220R. He did the much touted "pour a whole quart of oil in it" suggestion. When he got through riding the first time, he had oil leaking from his airbox from where the overflow had blown it out. What a nice mess it was with all the dirt and grass sticking to it.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By luke8500
      Hi all,
      I have a 2004 Kawasaki kx250 that died suddenly on me the other day. all i can get it to do is backfire every once in awhile. Tested the resistance and everything of the magneto and stator with a multi-meter and all is good.  Coil is new oem Kawasaki the reeds are brand new vforce and the top end and carb have been completely rebuilt.  key on crank is intact and all the timing marks are lined up. I hooked a timing light to it and spun the motor over really fast and found that it is sparking way to late.  The service manual says that it is supposed to fire 14 degrees before TDC but it is sparking way after TDC.  Im thinking its a fried CDI box since its the only thing i wasnt able to check.  Any help would be appreciated
    • By luke8500
      Hi all,
      I have a 2004 kx 250 2 stroke and it wont start.  it only backfires.  I was out riding it one day and came up to a stop so the bike was just idling and it started to try and die so i revved it up a few times then let it die and now it wont start back up.  It only pops or backfires when you kick it.  Its getting good spark and i just put a brand new plug and coil in it. I took the reeds apart and they look like they're brand new.  It was running great before so i dont know what happened.  Im thinking it could be a fuel problem even tho the plug is a little wet if you take it out after a bunch of kicking.  Any help would be greatly appreciated 
    • By Zach121
      Alright, found three bikes all located where i live in Texas. I know they're all very different, but if you could tell me what you think each bike is worth, and which one would be the best deal. Thanks.
      Notes: Both 2 strokes have new top ends. I think the front brake lever is broken on the kawasaki.
      KX250 2002 $800-$1000?

      YZ125 2000 $1250

      KTM 400SX 2002 $1200

    • By Ryan Turner
      So I'm at a bit of a cross roads, I currently own a 06 rm250 and I love it. I also have a 02 kx250 which I'm selling with intent to buy a newer two stroke. I can't afford a newer ktm and the older ones aren't that great and kawasaki never impressed me. so I'm stuck between 06 yz250 and 05 cr250. I've heard the yz and rm after 06 are almost the same bike just the Suzuki handles better and the Yamaha has better suspension. So I'm not sure if I wanna buy carbon copy of my bike with slight differences. That's why I'm interested in a cr250 I heard the 02+ models RC valves are shit garbage but was mostly fixed in the 05-07 models. I ride at a track and at some bogs down the road from me. So from people who have owned both, what would you recommend. I know the cr is known for a hard hitting power band which I enjoy since im an aggressive rider. Should i just see which deal comes my way first.
    • By dirtbikesrule
      If you own a 2 stroke dirtbike,please reply once. Im just wondering how many people on this site have them.