[THEFERMANATOR]

The excess fuel that most are accustomed to seeing come out of a 2-stroke is due to the inneficiency of a 2-stroke engine. Every time that a 2-stroke brings in air to the cylinder the exhaust port is also open at the same time. So some of the fuel-air mixture that was just drawn into the combustion chamber is lost through the exhaust, this is where most of the unburned fuel comes from. In the older cross-flow engine roughly 20-30% of the intake charge went out the exhaust unburnt. The newer looper's supposedly got this down to 8-15%.

In a direct comparison I have an 83 115 cross-flow engine and an 85 140 looper. The 115 burns roughly 11-12 GPH @ 4200, and my 140 with more HP burns about 8 GPH at the same RPM. And then you can compare a carb motor to an injected motor. The injected motor use's less fuel at idle since the fuel is injected under pressure which helps it atomize, where as a carb motor relies on vacuum from the engine to pull the fuel in and atomize it. Unfortunately 2 stroke's(espescially loopers) don't have very good vacuum at idle, so more fuel gets lost unburnt. And then you have the excess fuel for oiling reasons since the fuel actually carries the engines life-blood. And so on and so on.

DISCLAIMER: Most of this information is POOMA and is not guarranteed. I am in no way an engineer or designer, just a dumb hick who can decipher some of there code.