Live To Ride
Join Date: Sep 2010
Location: Iqaluit, Nunavut
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Straight pipes on a two stroke can be dangerous to the engine. Because of the design of the engine, the intake ports and the exhaust ports in the cylinder are both open when the piston is at bottom dead center. Some of the unburned fuel actually enters the cylinder and exits with the exhaust gas, but because of the length and shape of the pipe, at the exact moment the raw fuel/air is leaving the cylinder, a pressure wave rebounds from the restriction in the pipe and shoves the fuel back into the cylinder to be burned.
If you have a straight pipe, there will be no rebound and your air/fuel mix will be lean, which could cause excessive heat and melt holes in the pistons. If you make the fuel mix rich enough to be safe, your fuel mileage will go south, and your emissions will go up. You will also have really lousy performance at lower RPM. Carbs are designed around the tuned pipe, it will take you a long time (and probably a few rebuilds) before you find jetting requirements to keep the engine safe and still give power.
A tuned pipe eliminates all that and gives you more power to boot, as all the air/fuel mix is burned with no waste.