Did you ever wonder how you totally got your world rocked by Poison at their concert? It was likely the cheap beer you drank, and ganja - but just maybe it was the *soundwaves* dude. Now stay with me here. The same waves that make your face hurt from standing too close to a garmongous speaker at a concert are highly important in determining a 2-strokes performance. I was not aware of this - maybe you already know these mysteries of sound. Too bad, Im going to tell you anyway. The waves that rockout of the combustion chamber actually assist in removing out spent gasses - and then sucking in clean air. Like Bob Marley attacking a doobie, a well designed chamber can actually suck more air in to the cylinder and thus *charge* it. A virtual supercharger if you will. The key is the timing that these waves occur in the exhaust. Just as if the drummer for Def Leopard was totally off - the band would have sucked. The same applies here. What controls that timing, is where, and how much the exhausts diameter is increased, decreased, or kept consistent. That's why you've got that "belly" in your exhaust. Its actually where the timing between the negative and positive waves are adjusted. The length of the chambers also effects where the powerband is - generally longer chambers are going to move the powerband to lower RPMs. Now that my head is ready to explode from all this madness. In the end, the most rockin design for your bike depends on the tune of the engine, carbs, porting, etc. Expansion chamber design is a art - best practiced by someone other than myself. Im gonna go crack a PBR and air-guitar like a superstar. Keep on smokin'.
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