Engine
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Four-Stroke Engine (Most Common)
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Advantages: Better fuel efficiency, lower noise, cleaner emissions (meeting environmental standards), and easier maintenance.
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Displacement Range: Typically 50cc (for youth models) up to 1000cc (high-performance models), with adult ATVs usually between 250cc-700cc.
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Technology: OHC (Overhead Cam) or DOHC (Dual Overhead Cam) designs for improved airflow.
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Two-Stroke Engine (Rare, mostly in sport models)
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Advantages: High power-to-weight ratio, simple construction (ideal for racing modifications).
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Disadvantages: Higher fuel/oil consumption, greater emissions (phasing out due to regulations).
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Typical Use: Competitive racing or extreme off-road conditions.
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