Question about 2006 KTM 125 SX

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Clutch dont work

Hi i dont know a great deal on moterbikes when i go to put my ktm sx 125 in to first gear i pull the clutch in push the the gear change down and it just jumps forward and cuts out allmost like the clutch is not pulled in at all what might this be the clutch is hydrolic also what oil or fluid do i put in the clutch resevuor thank you for all your help joe

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What kind of fluid do you use

Posted on Mar 28, 2012

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If this still happens after she"s warm i"d say your clutch needs topping up with clutch fluid and bleeding. good luck

Posted on Mar 07, 2009

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This is a easy fix. All you have to do is let the bike warm up a few minutes before you take off. I would like you to try it your way first. Then let it warm up for 5 mins then see what happens, you can warm it up faster by reving the engine but let it run for 1 min before you rev it up. Enjoy your riding.

Posted on Dec 21, 2008

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Hi ave got a ktm 125sx 02 its just had a bottom and top end rebuild bike starts and runs great but there is still a rattle from the engine could anybody help thanks


Lots of engines make characteristic noises and air-cooled 2-strokes have lots of characteristic noises even when new and even when there is nothing wrong.

If you have just spent a parcel of money on it your first port of call should be to the person or dealer who carried out the work. Having a top and bottom overhaul means a world of different things to different people. If you don't know what has been done and what needed to be done you will be somewhat in the dark and at a disadvantage with perhaps unrealistic expectations.

Perhaps the engine hasn't had as much of an overhaul as you thought. A full bottom end overhaul is a good deal of cash and lots of work that would make it as good as a new engine again. Maybe the dealer decided for reasons of economy to refit some of the old parts instead of replacing everything.
I suggest you read your invoice and then go and ask some leading questions.

Apr 02, 2016 | KTM Motorcycles

1 Answer

I have a 2008 KTM SX-F 250 with only about 4 hours of ride time on it. It sat all of last year and only rode about 4 hours the previous year. This year the clutch does not engage, it feels fine but when...


I had the same prob with my bike heres what i did.. I took the cluch all apart soaked all the clutch plates in oil. Than i ordered new clutch springs from <Motosport.com.> Than put all back togeather and rebled the clutch and it work like a top.. HOPE THIS HELPS..

Mar 07, 2012 | 2008 KTM 250 SX-F

1 Answer

Hi my ktm 125 sx 2001 left hand crankcase has a 10 centimetre split right down the middle i dont think it can be a cheap fix with a weld cos the front sprocket must be sticking out a wee bit cos the chain...


a good weld shop can fix that with a price mind you. The best thing would be to replace it. you'll have to split the case to have it welded so why not just replace it. don't forget the seals and check the bearings.

Aug 13, 2011 | 2001 KTM SX 125

1 Answer

My clutch wont work


http://www.bikebandit.com/2002-ktm-motorcycle-125-sx/o/m4758#sch465207

Please see this schematic to understand your clutch.
There are springs which press two SETS of many plates together. One set is metal disk construction and splines into the inner hub of the clutch basket assembly. The other set is made up of metal, with (often) compressed cork material - these spline into the outer hub. When the lever is pulled in, the spring pressure is relieved off the plates, and the inner and outer hub are independent of each other. When released, the springs push the plates together, locking the inner hub(engine power) to outer hub(transmission) Now that you understand how it works, I'd say the solution is clear, open up the clutch and take a look at your plates.

Dec 01, 2010 | 2002 KTM SX 125

2 Answers

Start bike in nutral hold in clutch put into first and imediately stalls


G'Day mate,
Sounds like the bike has a stuck clutch, where the pressure plates and clutch plates are not disengaging, probably from sitting for a while. Check the clutch adjustments first to see that you have good operation and tension in the clutch lever. To break it free, try first allowing the engine to heat up to operating temp, this can sometimes allow the clutch to free up with heat expansion.
If you can get the bike to a rolling start(mate pushing) and get into a gear, go roll on and off the throttle a few times with the clutch pulled in, see if you can break it loose. Some peps have success with wrapping wire about the handle bar holding the lever in, and let it sit over night, let the oil into the clutch plates.
Dont get too carried away with dropping it into gear with the engine running. You dont want to do more damage. If it remains an issue, you will have to remove the clutch cover and tear the clutch down. check plates for wear and warping. Replace if required. Good luck with it.
regards robotek

Apr 09, 2010 | 2008 KTM 250 SX-F

1 Answer

Why my ktm 125 moves a little bit wen it's in gear


Clutch issue. Basket might be notched where the clutch plate tabs are. They wear grooves into the basket.

Nov 06, 2009 | 2006 KTM 250 SX-F

1 Answer

2006 KTM 125 sx high revving out problem


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

Jul 27, 2009 | 2006 KTM 125 SX

2 Answers

Clutch doesn't engage until bike gets hot


this is the same with all 4 strokes. they all need to heat up before you can ride them, but this is not a problem.

Dec 19, 2008 | 2008 KTM 250 SX-F

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