In regions where regulations are less stringent, or non-existent, small displacement two-stroke engines remain popular in mopeds and motorcycles. In countries and regions with stringent emmissions regulation, two-stroke engines have been phased out in automotive and motorcycle uses. Two-stroke engines have fewer moving parts than four-stroke engines, and thus are cheaper to manufacture. Two-stroke engines often have a high power-to-weight ratio, power being available in a narrow range of rotational speeds called the power band. In a two-stroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust (or scavenging) functions occurring at the same time. A four-stroke engine requires four strokes of the piston to complete a power cycle during two crankshaft revolutions. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being completed in one revolution of the crankshaft.
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