I have a 2004 ktm sx 125 i have no rear brake the pedal just goes all the way down myu pads are still new the bike only has 2 hours on it from new

Get new engine oil and ad a little bit more 2Stroke oil with petrol and make sure your water is full ?

Thanks for contacting FixYa. I was reviewing some of the older un-answered questions trying to ensure your issue has been resolved.

KTM Torque settings

1. Collar screw, front wheel spindle Front axle nut 40Nm 30ft lbs
2. Brake Caliper front Brake Caliper front Loctite 243 2 19ft lbs
3. Brake Disk, front Brake disk front Loctite 243 1 11ft lbs
4. Brake Disk, rear Brake disk rear Loctite 243 1 11ft lbs
5. Clamping screws, upper fork bridge Top triple clamp 20Nm 15ft lbs
6. Clamping screws, lower fork bridge Bottom triple clamp 15Nm 11ft lbs
7. Clamping screws, fork stubs Front axle pinch bolts 10Nm 7ft lbs
8. Collar nut, rear wheel spindle Rear axle nut 80Nm 59ft lbs
9. Hex nut swingarm bolt Swingarm nut 100Nm 74ft lbs
10. Hex collar screw handlebar clamp Upper handlebar clamps 20Nm 15ft lbs
11. Allen head screw handlebar support Lower handlebar clamps Loctite 243 4 30ft lbs
12. Shock absorber top Shock absorber top bolt 60Nm 44ft lbs
13. Shock absorber bottom Shock absorber botton bolt 60Nm 44ft lbs
14. Sprocket screws Rear sprocket bolts Loctite 243 3 25ft lbs
15. Ball joint for push rod Rear brake pedal pivot Loctite 243 1 7ft lbs
16. Engine mounting bolts Engine mounting bolts 45Nm 33ft lbs
17. Engine brace Engine brace 33Nm 24ft lbs
18. Screw adjusting ring spring preload Shock preload collar bolt 8Nm 6ft lbs
19. Spoke nipple Spokes 5Nm 4ft lbs
20. Other Screws on chassis M6 10Nm 7ft lbs
21. M8 25Nm 19ft lbs
22. M10 45Nm 33ft lbs
23. Other collar nutes on chassis M6 15Nm 11ft lbs
24. M8 30Nm 22ft lbs
25. M10 50Nm 37ft lbs
26. Front Sprocket 44ft lbs

TF

Thank you for contacting FixYa with your inquiry.
The following link will take you to a good source for your parts requirement:
http://cyclehuttktm.com/FicheFinderNew/FicheFinder.aspx
#1 52330000044 Superceeded Engine Case Cpl.w.tran.bear Look for Part Numbers 31007107001 50330000050.50330022000.503330 Another source: http://www.bikebandit.com/sem/ktm-parts?WT.mc_id=2676712&WT.srch=1
Or Motorcycle superstore: http://www.motorcycle-superstore.com/2/10/213/19924/PDEPT/Dirt-Bike-Motocross-Engine-Parts-2001-KTM-125-SX-Parts.aspx
Sometimes these people will be parting out a 125 SX: http://www.powersportswarehouse.com/fiche_select1.asp?cat=Motorcycles&mfg=KTM&gclid=CPb2ka7s0aoCFYjsKgodZQoh0Q
Hopes this helps you locate a case half. It's a pretty common bike and popular bike. There are a bunch of them out there, mostly in service.
Kind regards,
TF

Look on top of the piston it will be nothing = stock bore
.010 = 10 over ect
.020 is 20 thousand over stock

a compressed air hose will do it, just make sure it is wrapped in rags to catch the piston and some brake fluid that will come out.
Dont point it towards anyone when you do it.

On the right side of the engine, just to the rear of the cluch cover and just ahead of the rear brake lever spring...remove weep bolt(will have a soft metal sealing washer, usually 10mm bolt head). When full, oil should just trickle out the bolt hole with bike held upright.

I have rode bikes for years now, Brakes are a must and when it comes to myself always better safe than sorry, replace parts that malfuction or aren't working properly. Its a lonely place out on the trail miles from any help with broken parts.

Look at the slide needle--'c' clip unbroken and retainer pushed down tight. Has the 'c' clip position been changed? Try a new spark plug.

Look into your power valve. If it doesn't operate freely, you won't get peak performance. They can get gummed up.

give the serial # to a local dealer they should be able to tell you