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New Valve seats on 2004 KX250F

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I have a 2004 RMZ250 (it has the same motor as the 2004 KX250F) which likes to pull the valves into the head, it means that around every 10 hours I need to have the valve clearances checked. The bike becomes a mother to start and is just unpleasant to ride. I had new valves installed in November last year but already needed to have the valves set.

We have a local dealer that does modifications to the head by inserting new wider valve seats and new valves, they say that this sorts the problem out and that the bike could probably do 150 hours before needing the valve clearances set.

What I would like to know is if anyone has had this done to their bike and what your experience has been?

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