I dont know how to check the transmission fluid level on my ktm 125sx

I have the same problem with my 2006 Ktm 125sx! I am in the process of taking it apart did you find out what the problem was?

Thank you for contacting FixYa with your inquiry.
KTM recommends .7 Liters Motorex Top Speed 4T15W50 for the 125SX.
Let us know if we can be of further service.


Kind regards,
TF

The Magura hydraulic clutches on KTM's aren't really adjustable. If it's dragging a little when you put it into gear, there is still air in the system.The proper way to install the fluid is to fill it with a syringe from the bleeder screw until the reservior is full. This insures there is no air in the system. There are kits available aftermarket specifically for Magura hydraulic clutches that come with a syringe and a new line for around 30 dollars. It is a good idea to change the fluid and line every couple of seasons.

unless u absolutely know what youre doing id advise taking it into a shop and getting it done should cost anywhere between 110 and 140

www.ktm.com
Choose your model and there is a tab for "Downloads", most I looked at show back to 2008, so your 2009 should be there. The 2009 125SX manual is now listed under the 2011 150SX, I assume this is what you have.

YOUR TRANSMISSION DONT HAVE TRANSMISSION DIP STICK YOU HAVE A LEVEL CHECK PLUG ON BACK SIDE OF OIL PAN YOU NEED A SCREW DRIVER TO PRY OUT LEVEL CHECK PLUG.WITH ENGINE RUNNING FLUID TEMPERATURE 95 TO 113 DEGREES. IF FLUID COMES OUT SMALL DRIPS FLUID LEVEL OKAY.IF FLUID POURS OUT CHECK HOLE YOU HAVE TOO MUCH FLUID IN TRANSMISSION. IF NO FLUID COMES OUT CHECK HOLE.ADD A PINT OF FLUID AT A TIME SO YOU WONT OVERFILL TRANSMISSION. YOU NEED A NEW CHECK PLUG O - RING. IF YOU REUSE THE OLD O-RING YOU WILL HAVE TRANSMISSION FLUID LEAK.DONT REMOVE CHECK LEVEL PLUG UNTIL YOU HAVE PLENTY TRANSMISSION FLUID ON HAND AND A NEW CHECK PLUG O- RING THE DEALERSHIP HAVE IT.

Sounds like a major broken bike!
What i do, is remove the gear that runs between the crank, and clutch to see what end is frozen, the transmission, or the engine.
You can also take off the exhaust pipe and look in the hole for damage.

I would check the work you did on replacing the clutch as the most obvious place to look.

here is a website link for yours owners manual
http://www.repairmanual.com/motorcycles/2002/36/0/12714/13416