2-Strokes

 what is a two stroke?

A two-stroke engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston during one power cycle, this power cycle being completed in one revolution of the crankshaft

why pick a two stroke 

Two-stroke engines are often smaller, lighter and simpler than four-stroke engines and deliver a higher power-to-weight ratio

why are some two strokes outlawed

A carbureted two-stroke engine can emit up to 25-30 percent of its fuel unburned into the water or atmosphere

Uses of two strokes 

Lawn and garden equipment including many string trimmers, chain saws, polesaws, brushcutters, and leaf blowers. Dirt bikes.