125-200cc Excessive oil in exhaust

I have an '09 WR125, bought it in December. It has recently started showing a lot of oil in the exhaust, i.e., running it for 10 minutes and there's oil dripping all the way down the silencer onto the swingarm. This was never the case until recently.

Only changes I've made to the bike are 1) Change crankcase oil and used Rotella T6 as suggested by the previous owner. 2) Changed the airfilter and may not have gotten all of the excess air filter oil off the air filter. It doesn't seem to be running much different as far as I can tell, and it isn't fouling plugs. Any thoughts?

Also, while I'm here, it seems to be dripping quite a bit of fuel out of a tube that looks like it comes from the carburetor bowl (stock Mikuni). After I shut the bike down, it'll drip heavy for several to 10 minutes. I hadn't noticed it much before, but it seems to be dripping more now than it did when I bought it in December. Any thoughts on that? For what it's worth, I've been riding the bike pretty hard. I have yet to pull the carb apart, I'm new to the whole "now there's an engine on my mountain bike" thing so forgive me if I'm asking daft questions. I've done a bit of searching and haven't found much help.

If it helps, it's the Mikuni TMXX carb with an RM needle. Haven't pulled it apart to see what my jetting is, but it runs well so I haven't wanted to mess with it too much. Stock pipe.

The dripping will be a stuck or badly adjusted float. Tapping on the float bowl with the handle of a screwdriver should loosen it up. But go ahead and pull the bowl off and clean it out with some spray. There should be some info on here about what to look for in a worn float valve, but I can't search for it right now.

Is it smoking a lot too? Clouds of white smoke would point to the main seal being out, and the engine sucking the transmission oil. That would put quite a bit more oil into the exhaust than normal.

What premix oil and ratio are you running?

I am running 44:1 Spectro. I am doing much more slow, tight, trail riding, and I have no idea when the muffler was last repacked, I was actually thinking that may be a culprit. It may be smoking a bit more than it used to, it's hard to tell. I can say, if I hold my hand behind the exhaust and crack the throttle, I get a pretty nice little shiny, oily, black palm, for what that's worth. Anyone know where to find a service manual for one of these bikes? Those also seem to be hard to track down on the internet...

Thanks for the info!

It's your jetting.You may wish to drop the pilot down one or two.
It's not the oil, however I do prefer a different brand. How many hours do you have on the top end?

What he said and your riding style. Spooge has more to do with the way you ride. If you ride a 125 around like a 300, shift early and never get on the pipe, it's going to spooge a lot.

Consider going to 50:1 on your mix and an "8" heat range on the plug.

This is true. Check my post in the Amsoil thread, where I explain why.

your Mohawk skull is scary motorhead, you gone all outlaw bikie on us?

As soon as I get a Harley.

Ok the spooge on my WR250 really bothers me. I have been riding 2 strokes since 1972 and every bike I have ever had after the jetting is correct no more spooge just a wet ring at the tip that desert dust turns into a crust. When I got the bike new, the dealer said to run the tank of 32.1 bean oil through it for break in. Ok I’m good with that major spooge but it should be temporary. Now after switching to a PWK , 50.1 Bel-Ray H1-R, jetting is all good and repacked the muffler the spooge is greatly reduced but still there. It now takes an 80 mile desert race before it starts dripping on the swing arm.

Any more ideas the float level is correct. The exhaust temp makes since has anyone that removed the thermostat notice anything change

Your jetting needs more tuning.Try using Torco GP-7 or T-2R oils which burn extremely clean.

Also, here at ZTR, we remove all thermostats and use our XF coolant. Give us a call, ask for Danny or Ty Davis.

When the carb is off inspect the reeds- they may be chipped on the edges allowing excess gas to enter and the unburned fuel is coming out as spoog. Hold the reed block / petals up to the light and you should not see much coming through. Keep in mind these thin petals open and close thousands of times each minute you ride...