Automatic KTM Timing Chain Tensioner for the RC4, XC4, RF4, 2008-2012 motors (250, 400, 450, 505, 530 all models).
Also fits 2009-2012 Husaberg 390, 450 and 570. Husaberg installation requires special instruction (tensioner must be installed collapsed, this requires laying your bike on its side to install).
- If you have a "ticking" noise at idle, on your newer four-stroke, you need this part. Resolves issues with a slack timing chain on the new four-stroke motors.
- Uses oil pressure combined with a mechanical ratchet system to prevent collapse.
The 2008 and newer four-stroke KTMs (and some earlier SX models) use a timing chain tensioning device intended to develop its force using the engine oil pressure hydraulically.
The OEM components have serious flaws (reviewed below), which can leave the timing chain in a slack condition. This can have disastrous consequences. Dirt Tricks has developed a simple, effective and failsafe replacement. The new tensioner correctly captures the oil pressure. Additionally, it uses a positive mechanical ratcheting system which prevents it from collapsing. The replacement unit will work on all newer four-strokes in 250, 400, 450, 505, 530 models using the RC4, XC4, or RF4 motor (not for the RFS motors). This means the following bikes:
KTM 05-10 SX-F/XCR 250 4-stroke models.
07-11 SX-F/SXS-F 450.
2008-2012 all 400, 450, 505, 530 4-stroke models.
HUSABERG 2009-2010 390,450 and 570 models.
* Does NOT fit 2011-2013 350's (different tensioner made for 350)
- * Does NOT fit KTM 2012 SX-F 450 Factory Replica Edition
* Does NOT fit 13-15 SX-F 250/450
* Does NOT fit 12-15 EXC 500, XC-W 450/500
With very satisfying test results from our race bikes, we have completed CNC production of the new tensioner. They can be installed in less than five minutes.
As the spring is inserted and you compress it, you can feel and hear the clicks as the piston ratchets into position. There are a total of 11 ratchet positions at 1mm spacing. If you extend to more than 9 clicks, you probably need to replace your timing chain.
Below is an overview of the OEM design verses the Dirt Tricks design.
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