Agree with the above post. It mainly effects the "squish" which causes more turbulence at top dead center. Valve reliefs in pistons are just that. Valve reliefs.
If you want to make it go Blocker, stick to the 3 C's. Cam, carb and compression.
Also have to say that when I down graded my CRF450 to stainless inlet valves it made very little difference to riding the bike. Might have lost a few hundred rpm and its a fraction less snappy but it will go for another years. The titanium valves were unreal.... for 1500km and then they hammered into the head. Performance is all relative to usability.
It has a flat top piston by the way, runs only two rings and has virtually no skirt at all.
141_0607_13_z+2005_honda_crf450x+piston_skirt.jpg
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