Re: Doing my first build. HOLY COW!
Welcome. I've heard nothing but good about gasbike.net'e engines and bikemotorkit.com's engines. Performance carbs and exhaust systems are really only a matter of preference on where you want the powerband to peak, like in the lower, middle, or upper range of the RPM range. This is the case for 2 and 4 stroke engines, but 2 stroke engines especially. If you want raw hill climbing power and acceleration, go with a big rear sprocket, and a long pipe before the muffler or expansion chamber. If you want top speed, go with a small rear sprocket and a short pipe before the muffler or expansion chamber. Intake length and carbs aren't nearly as impactive on these parameters as exhaust pipe length and rear sprocket size. Hope this helps!