Question about 2003 KTM SX 125

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I have a KTM 125sx but my clutch doesn't work. She's looking like a "break". The clutch don't move easily as normally. I have changed the motor and the clutch recently...

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

Posted on Jul 01, 2009


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I've got a KTM 125sx 2002 I've done a top end rebuild piston etc and put a new coil and plug on it and the bike won't start with the kicker, only with a bump start took the plug out and its got a weak

Hi, Ian and the usual suspects are:
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Hi, Anonymous the starter clutch is a separate mechanical gear driven component that is activated by the starter motor, it engages the clutch pack gear or the flywheel gear to turn over the engine. It has an internal mechanism that allows the gear to turn in one "ONE DIRECTION" only and once the engine starts allows the gear to free spin with engine rotation. If the starter gear free spins in "BOTH DIRECTIONS" then the drive gear has failed, it might be serviceable on some models but usually needs to be replaced.
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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?

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1 Answer

Rear brake, it bites but then the lever goes soft all the way to the bottom and you lose the breaking. i have bled and replace fluid. still the same.

Thank you for contacting FixYa with your inquiry.
This is a common problem with KTM rear breaks. There is two things you need to do.
  • Adjust your brake cable so it has a little more slack in it and you won't be riding it when your not breaking. Unknowingly you have been depressing it with your toe until it becomes hot and then you loose the breaking ability of the fluid.
  • There is a aftermarket rear break cooler available at the KTM shops that corrects this issue. It cools the fluid and allows normal breaking. It's quite inexpensive and well worth the cost. No need to be out in the brush all the time because your breaks don't work and you constantly have to catch up with your buddies because your breaks don't work. It's hard on jerseys.

Thanks again for the inquiry,

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I have a 2002 ktm 125sx how much oil does it hold

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,

Jun 20, 2011 | 2002 KTM SX 125

1 Answer

2005 ktm 125sx how to adjust cluch after it has been bled from bottom..doesn't slip, just wants to move a little when in gear with click in..

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.

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Normal thread. Might need an impact wrench if you've never had the hub off. Just put the bike in gear and have someone hold the rear brake then the impact wrench should get that nut off nice and easily. All the best!

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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.

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2005 ktm 125 engine is froze up

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.

Nov 04, 2009 | 2005 KTM SX 125

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