On most KTM & Husabergs, including the earlier RFS & XC4 motors, the cam chain tensioner doesn't work that well. On the RFS motor it was a ratchet design. As the chain wears, slight spring tension pushes the guide in towards the chain & the push rod moves forward one notch. It allowed the cam chain a fair amount of slack & this translates to excessive cam chain noise / engine noise. A friend's XC4 motor even had the push rod come loose, preventing the motor from starting. He promptly replaced it with the Dirttricks cam chain tensioner.
I decided to do this straight away for the FX450, rather than waiting till there is excessive noise, as it's an easy replacement.
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Dirt Tricks tensioner to the rear (bronze)
For berg installation you need to drop the
bike on it's side for the ratchet to stay in place
KTM must have caught on, as their new 2012 450 engine has a new 'mechanical cam chain tensioner'
link
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