Can anyone tell me what is leaking from my engine (pic)

I have this brown substance (resembles oil) leaking from a small hole on the right side of my motor. It is a new bike to me only put about 10 hrs on it since I have had it, but have never seen this before. It had been raining here pretty good and I was doing a lot of puddle splashing and I am thinking that that probably had something to do with it, but I am wanting a little guidance before I go out on it again. Bike is a 2006 YZ450F. See pic. (never done this before, hope it works!!)

-didn't work, here is a link:

http://www.flickr.com/photos/38592005@N04/3838229037

pic doesnt work try again

Thats the water drain hole for the spark plug acess.

u have some rust build up between the sparkplug and the housing..

i thought that was the oil overflow hole? i might be wrong but if it is that could mean u got water in the oil which would mean there is now to much fluid in there and could be leaking out the whole which would explain its colour, but again i might be wrong.

i thought that was the oil overflow hole? i might be wrong but if it is that could mean u got water in the oil which would mean there is now to much fluid in there and could be leaking out the whole which would explain its colour, but again i might be wrong.
You are wrong. That hole drains the spark plug well of any fluid that might accumulate there. The common culprits would be fuel "smooge" from a loose spark plug, oil from a leaking cam cover gasket, or water from your last wash job.

Water-contaminated oil looks nothing like that. If you look, you'll probably find the spark plug rusted.

remove the spark plug wire, blow compressed air in that hole to clean out any accumulated dirt in there.

If you want to, at this point you can spray some cleaner in there to wash out any residue that may reside around the plug, use some more compressed air to dry the cleaner thats around the plug, wipe any remains off the outside by the hole.

Remove the plug - you'll see it'll likely be rusted or oily as Grey said.

Clean the plug - check the gap(if it's not super old) or just change to a new plug, put it in, torque it properly.

Reconnect your wire and go riding.

You might have to remove shrouds and tank depending on the tools you are using.

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