First, stainless steel intake valves are not going to be the cause of lack of power. It's not accurate that the added weight of stainless intake valves would consume a significant amount of engine output.I am the third owner of my '06 250X and I wanted to know how to tell if I have stainless steel valves because I will be checking the clearances soon. The reason I ask is because the second owner told me that the first owner did a few modifications to the bike and that he said the valves were good for years yet. When the second owner bought it he had a shop check them, and they said the same thing. It also has a noticeable lack of top end power compared to my brother's WR250F and I know SS valves are heavier and have stronger springs which could cause this. Any ideas on how to tell without pulling the head off.
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