The TM 125 uses 550 ml of gear oil. There is level inspection screw situated behind the rear brake lever. Access is a little tricky, but not too tough. For racing motocross I recomend ATF, but must be changed after each race day. For enduro, outriding or Sunday riders, BelRay -Trans Oil 80 W is best. You should change oil roughly every 500 km to prolong gearbox life.
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I would only use ATF Type F (Automatic Transmission Fluid) in the TM gearbox mate. Alot of folk use light gear oil, but in my experience, it just isnt up to standard whilst ragging the nuts off the engine. All our race bikes (including our TM) use ATF, and we have had no problems.
Check the oil level in the gearbox. The only thing that would make that kind of noise is a bearing going dry / bad. Use 10w40 motor oil in the gearbox. NEVER use synthetic oil. Synthetics can screw up the clutch.
Remove gearlever,drain gearbox oil,drain coolant,remove powervalve actuator cover,place small allen key in slot provided & remove bolt on actuator,remove radiator to waterpump hoses,remove clutch cover,slide shaft out from left to right,(If clutch hub is in the way remove clutch assembly),fit new shaft ,reassemble,replace gearbox oil & coolant & bobs ya uncle.
Normally there is no adjustment of a hydraulic clutch. The slave cylinder is driven the same distance each time the master cylinder is actuated by the clutch lever. Unless you have low fluid, I expect your clutch is slipping due to wear or weak springs or possibly due to additives that should not be used with a wet-plate clutch running in engine oil. Check your owners manual for oil recommendations to make sure you have suitable oil for your bike.
Okay, this may take a couple of comments back and forth but I can get you back on the road. First, Have you done any work on the clutch lately? If so, what and why? Did the clutch work okay after the work? Have you changed gearbox oil in the last month or so? If so, EXACTLY what oil did you put in the gearbox? i.e. "10w40 Mobil Super Blue fluid with silicone friction limiters". Just post a comment to get back to me.
Dump the special oil and go back to 10w40 motor oil. The manufacturer does not recommend any "special" oils be used. They can cause the clutch friction disks to swell among other problems like you currently are having. If possible, stick with the name brands; Shell, Mobil, Pennzoil, Quaker State, etc.. It may take awhile to rid the bike of the synthetic oil but get it out of the gearbox as soon as possible.
Please take a moment to rate this answer. Thanks Tim.
Your bike is water cooled. Some of that water is leaking into the gear box. The cylinder gasket is the likely leak. I would let the shop take a look at it instead of trying to fix it yourself.
But be sure there is not an external source for the water. Do you wash the bike often? Ride the creek bed often? Leave the bike where the lawn sprinkler gets the bike wet? Leave it out in the rain? Change the oil and keep the bike dry. If the problem comes back then go see the dealer.