Along with that a head can also be milled on the combustion chamber side. A special machine is required for this so most will need this done by a professional. This is the process of removing metal from the cylinder side of the head. This squeezes the combustion chamber and piston closer together creating more compression. Gasoline gets more explosive the more it is compressed. More compression=stronger explosion=more power. At this point it should be mentioned that if you are not using high octane gasoline you REALLY should. Also it is a good idea to use 100% gasoline (no ethanol) if it is available to you. This is a good rule of thumb in ALL small engines.
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MXR TrailBender 160R
SYC Perf head P&P,Matched intake and exhaust, A12 cam, Orange CDI & coil, Motorio pulley, 115mm Variator and lightweight drive face,11gm Sliders, UNI, modded muffler + 200 horsepower 
http://www.youtube.com/watch?v=3hx-hEWl10c
I'll take your insults as compliments and blame it on your lack of intelligence.
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