Polaris Sportsman 450 570 ATV Engine | Complete OEM Replacement Motor

This heavy-duty 450cc/570cc air-cooled complete engine assembly is professionally engineered as a direct OEM replacement for Polaris Sportsman 450 and Sportsman 570 ATV quad bikes. Designed specifically for harsh off-road environments, farm work, hunting and rugged terrain riding, this 4-stroke single-cylinder engine delivers reliable torque output, stable power delivery and excellent dust-proof and anti-vibration performance. Every engine is fully pre-assembled and undergoes strict factory testing, perfectly solving common problems including weak climbing power, difficult cold starting, oil leakage, engine stalling and abnormal noise. It is the most cost-effective power replacement solution for aging Polaris Sportsman ATV engines.

• Perfect OEM direct fit for Polaris Sportsman 450 and Sportsman 570 full-series ATV models
• Reliable 4-stroke single cylinder air-cooled design, excellent heat dissipation for long-hour off-road operation
• Powerful low-end torque output, ideal for hill climbing, heavy towing, farming and cargo work
• Reinforced anti-shock and anti-vibration structure, adapts to rough and bumpy terrain
• Advanced EFI fuel injection system ensures fast cold start, stable combustion and low fuel consumption
• Full complete engine assembly, direct bolt-on installation with zero modification required
• 100% factory compression tested, pressure tested and idle running verified before shipment
• High-precision wear-resistant internal parts, ultra-low failure rate for harsh outdoor environments
• Simple structure and easy daily maintenance, greatly reducing long-term repair costs
• Fully compatible with original PVT transmission, wiring harness and exhaust system

Engine Type: 4-Stroke, Single Cylinder, Air-Cooled, SOHC

Displacement: 449cc (Sportsman 450) / 567cc (Sportsman 570)

Bore * Stroke: 92mm * 67.5mm (450cc); 99mm * 73mm (570cc)

Max Power: 33HP / 7000rpm (450cc); 44HP / 6700rpm (570cc)

Max Torque: 40Nm / 5500rpm (450cc); 52Nm / 5000rpm (570cc)

Ignition System: Digital CDI Electronic Ignition

Starting Mode: Electric Start

Fuel System: EFI Electronic Fuel Injection

Lubrication System: Pressure & Splash Combined Lubrication

Cooling System: Forced Air Cooling

Transmission Type: Automatic PVT Transmission

Required Fuel: 92#/95# Unleaded Gasoline

Engine Oil: 10W-40 4-Stroke ATV Special Oil

The engine outer shell adopts high-strength die-cast aluminum alloy, which is lightweight, high-rigidity and impact-resistant, effectively resisting external collision and dust erosion in off-road scenarios. The cylinder block is equipped with a thickened high-precision cast iron liner with anti-wear and high-temperature treatment, adapting to long-term high-load and high-temperature operation. The forged steel crankshaft and connecting rod undergo precise dynamic balancing calibration to avoid jitter during high-speed operation. The heat-resistant hypereutectic aluminum alloy piston effectively prevents high-temperature deformation and ensures sufficient combustion efficiency. The reinforced valve train and camshaft structure improve wear resistance, reducing failure rate under frequent start-stop and heavy-load working conditions. The integral heat dissipation rib structure enhances air cooling efficiency, ensuring stable engine operation in high-temperature outdoor environments.

Compatible Models: 1. Polaris Sportsman 450: All Year / Standard / HO Version 2. Polaris Sportsman 570: Base / EPS / SP / Touring Full Series

Fitment Advantage: Strictly manufactured according to OEM standards, consistent with original mounting holes, wiring ports and oil pipeline positions. Plug-and-play direct replacement, no drilling, cutting or wiring changes. Highly matched with original frame, transmission and electrical system for perfect installation accuracy.

All ATV engines are produced in ISO9001-certified standardized factories with strict production process management. Each finished engine undergoes multi-dimensional strict pre-shipment tests, including cylinder compression test, fuel system sealing test, idle stability test, high-load operation test and cold start test, ensuring no oil leakage, sensitive startup, stable power output and no abnormal noise. We provide 6-month professional quality warranty service. All non-human damaged quality problems support free replacement and one-on-one professional technical guidance, allowing global dealers and individual off-road enthusiasts to purchase with confidence.

Adopts professional export-grade multi-layer protective packaging: internal anti-rust oil coating, waterproof and moisture-proof plastic film wrapping, high-density foam anti-collision protection, and external reinforced solid wooden box packaging to prevent extrusion, collision and moisture damage during long-distance international transportation. The gross weight of a single engine is about 42kg with standard export packaging dimensions. It supports global shipping methods such as sea freight, air freight and international express, suitable for retail and bulk wholesale export to North America, Europe, Australia, Southeast Asia and other global off-road part markets.

Professional mechanical installation is recommended to ensure assembly accuracy and off-road driving safety. Replace brand-new supporting gaskets and oil seals during installation to enhance engine tightness and prevent oil leakage. After installation, inject 10W-40 dedicated 4-stroke ATV engine oil and fully inspect the tightness of fuel pipeline, wiring harness and fixed parts. The new engine requires a 500km break-in period; avoid long-time full-load climbing and heavy-load towing during the break-in period. After break-in, replace the engine oil and clean the filter element to optimize engine power and stability. Regularly clean the engine heat dissipation ribs and dust cover to ensure air cooling effect and extend engine service life.

Ideal for personal Polaris ATV engine replacement and repair, off-road vehicle maintenance shop spare parts supply, outdoor engineering vehicle bulk procurement, ATV power upgrade modification, and global off-road parts wholesale business. Widely applicable to farm traction, field hunting, mountain cross-country, outdoor engineering operation and daily leisure off-road riding, it is the most reliable OEM replacement part for Polaris Sportsman 450/570 ATV owners.

• Durable air-cooled structure, easy maintenance, perfect for harsh outdoor & off-road scenarios
• Strong low-speed torque, outstanding performance for climbing, towing and farm work
• Exact OEM dimension, direct bolt-on installation without any modification
• Stable EFI fuel system, fast cold start and excellent fuel economy
• Reinforced dustproof & anti-vibration design, low failure rate for long-term heavy use
• Full complete assembly, ready to install and save matching cost
• Factory direct price, stable quality with high cost performance
• Strict pre-shipment inspection and professional after-sales technical support