two-stroke
Chainsaw motor type
Two-stroke describes an engine that completes its power cycle in two piston movements rather than four, making it simpler and lighter but less fuel-efficient and more polluting.
Two-stroke engines power many motorcycles, chainsaws, outboard motors, and lawn equipment: The old two-stroke dirtbike trailed blue smoke.
Also used as a noun: Most scooters run on two-strokes.
Reciprocating cylinder component
- crankshaftRotating engine shaft
- carburetorEngine fuel-air mixer
- combustionExothermic reaction with oxygen
- exhaustUse up entirely
port · ignition · displacement · cylinder · scavenging · premix · air-cooled · bearings
Off-road motorcycle
- motocrossOff-road motorcycle racing
- enduroLong-distance off-road racing
- scooterTwo-wheeled standing vehicle
- mopedSulked or wandered sadly
minibike · snowmobile · jet-ski · go-kart · ultralight · rickshaw · tuk-tuk · Vespa
Rotational force measurement
- horsepowerRate of mechanical work
- powerbandPeak engine output range
- accelerationRate velocity changes
- power-to-weightOutput per unit mass
revs · top-end · peaky · screamer · racing · tuning · porting · jetting
Airborne combustion byproduct
- exhaustUse up entirely
- fumesAirborne chemical irritants
- pollutionEnvironmental harm from waste
- emissionsSubstances released into air
hydrocarbon · particulates · EPA · regulations · environmental · phaseout · banned · dirty
piston
Reciprocating cylinder component
- crankshaftRotating engine shaft
- carburetorEngine fuel-air mixer
- combustionExothermic reaction with oxygen
exhaust · port · ignition · displacement · cylinder · scavenging · premix · air-cooled · bearings · gearbox
dirtbike
Off-road motorcycle
- motocrossOff-road motorcycle racing
- enduroLong-distance off-road racing
- scooterTwo-wheeled standing vehicle
moped · minibike · snowmobile · jet-ski · go-kart · ultralight · rickshaw · tuk-tuk · Vespa · Lambretta
torque
Rotational force measurement
- horsepowerRate of mechanical work
- powerbandPeak engine output range
- accelerationRate velocity changes
power-to-weight · revs · top-end · peaky · screamer · racing · tuning · porting · jetting · pipe
smoke
Airborne combustion byproduct
emissions · hydrocarbon · particulates · EPA · regulations · environmental · phaseout · banned · dirty · smelly
simplicity
Lack of complexity
- lightweightLacking mass or importance
- loudHigh in volume
- buzzyGenerating excited chatter
raspy · smoky · oily · vibration · reliable · rugged · inexpensive · break-in
- engine specshorsepower, torque, displacement, RPM, compression ratio
- moto-xsupercross, freestyle, dirt bikes, tracks, riders
- Motocrossmotocross, supercross, holeshot, whoops, whoop
- Motorcycle RacingMotoGP, motocross, superbike, road racing, supersport
- motorsportsracing, race, race tracks, Daytona 500, racing teams
- enginesdiesel engine, gasoline engine, car engine, truck engine, piston engine
two-strokefour-stroke
Engine completing cycle in four stages
four-cycle · four-stroke engine · rotary engine · electric motor
two, stroke, striking, twice, strokes, stroking, stroked, two-stroke engine, twofold