A “stroke” means a piston moving from “top” to “bottom” or vice versa   2-Stroke Engines Pros: Lighter, simpler design (no valves), higher power-to-weight, cheaper to build, easier to repair. Cons: Less fuel-efficient, higher emissions (burns oil), noisier, shorter lifespan, requires oil mixed with fuel. Best For: Chainsaws, dirt bikes, smaller outboard motors, RC cars.   4-Stroke … Continue reading 4-Stroke & 2-Stroke Engine | Its Parts & Working Explained