Gilera Nexus500 E3 / Aprilia Atlantic 400 Maxi Scooter Engine Motor

This premium 400cc/500cc liquid-cooled complete engine assembly is professionally manufactured as a perfect OEM replacement for European classic maxi scooters, including Gilera Nexus500 E3 and Aprilia Atlantic 400 models. Built with 4-stroke single-cylinder 4-valve technology, this engine delivers strong power output, stable torque performance and excellent continuous heat dissipation, fully meeting the high-load demand of highway cruising, long-distance touring and daily urban commuting. Every motor is fully pre-assembled and undergoes strict factory testing, effectively solving common engine faults such as weak power, hard starting, oil leakage, abnormal vibration and noisy operation. It is the most cost-effective power replacement and upgrade solution for aging maxi scooter engines.

• Exact OEM fit for Gilera Nexus500 E3 Euro 3 and Aprilia Atlantic 400 maxi scooters
• Advanced 4-stroke single-cylinder 4-valve liquid-cooled structure for stable long-time operation
• Strong low-end torque and explosive mid-high speed power, ideal for highway and hill climbing
• Optimized internal structure for low vibration and low noise, improving long-distance riding comfort
• Precise fuel injection combustion system, balanced power performance and fuel economy
• Full complete assembly design, direct bolt-on installation without cutting or modification
• 100% factory dyno tested, pressure tested and idle stability inspected before shipment
• High-temperature resistant and wear-resistant core parts, ultra-low failure rate and long service life
• Mature CVT automatic transmission system, smooth and responsive shifting performance
• Strict Euro 3 emission standard, compliant with European market regulations

Engine Type: 4-Stroke, Single Cylinder, Liquid-Cooled, SOHC 4-Valve
Displacement: 399cc (Atlantic 400) / 499cc (Nexus500 E3)
Bore * Stroke: 84mm * 72mm
Max Power: 25.7kW / 7500rpm (400cc); 32kW / 7000rpm (500cc)
Max Torque: 37.7Nm / 5700rpm (400cc); 45Nm / 6500rpm (500cc)
Ignition System: Full Transistor CDI Ignition
Starting Mode: Electric Start + Backup Kick Start
Transmission Type: CVT Automatic Continuously Variable Transmission
Cooling System: Forced Liquid Circulation Cooling
Lubrication System: Pressure & Splash Dual Lubrication
Emission Standard: Euro 3 (E3) Compliant
Applicable Fuel: 92#/95# Unleaded Gasoline
Recommended Oil: 10W-50 Fully Synthetic 4-Stroke Scooter Oil

The entire engine casing adopts high-strength die-cast aluminum alloy, featuring lightweight, high rigidity and anti-deformation properties, effectively reducing overall vehicle load. The cylinder block is equipped with a thickened precision cast iron liner with high-temperature oxidation and wear-resistant treatment, avoiding cylinder pulling and abrasion during long-term high-load operation. Forged alloy steel crankshaft and connecting rod undergo professional dynamic balancing calibration to ensure stable high-speed operation without jitter. The hypereutectic aluminum alloy piston with heat-resistant coating effectively resists high-temperature deformation and improves combustion efficiency. The precision 4-valve cylinder head enhances intake and exhaust efficiency, fully releasing engine potential. The integrated ribbed heat dissipation structure cooperates with the liquid cooling system to achieve rapid and uniform heat dissipation, completely solving the overheating problem of large-displacement maxi scooter engines.

Fully Compatible Models:
1. Gilera Series: Nexus 500, Nexus500 E3 Euro 3 all year models
2. Aprilia Series: Atlantic 400, Atlantic 400 Sprint maxi scooter full series
Fitment Features: 100% consistent with original mounting holes, wiring harness interfaces, oil and water circuit interfaces. Supports plug-and-play direct replacement without drilling, cutting or wiring modification. Specially customized for European maxi scooter platforms, perfectly matching the original frame, exhaust system and electrical system with zero installation barriers and ultra-high fitting accuracy.

All engines are produced in ISO9001-certified standardized factories with strict production process supervision. Each finished engine undergoes multi-dimensional strict pre-shipment tests, including power dyno test, oil pressure sealing test, water leakage test, idle stability test and high-load continuous operation test, ensuring no oil/water leakage, sensitive startup and standard power output. We provide 6-month professional quality warranty service. All non-human-induced quality failures support free replacement and one-on-one technical guidance, enabling global dealers and individual users to purchase with full confidence.

Adopts professional export-grade multi-layer protective packaging: internal anti-rust oil coating, waterproof plastic film wrapping, high-density foam shock absorption, and external reinforced solid wooden box packaging to prevent collision, extrusion and damage during long-distance international transportation. The gross weight of a single engine is about 35kg with standard export packaging dimensions. It supports global shipping methods including sea freight, air freight and international express, suitable for retail and bulk wholesale export to Europe, Southeast Asia, Middle East and South America markets.

Professional technician installation is recommended to ensure assembly accuracy and riding safety. Replace brand-new matching gaskets and oil seals during installation to enhance engine tightness and prevent liquid leakage. After installation, inject 10W-50 fully synthetic engine oil and fully inspect oil circuit, water circuit and wiring harness tightness. New engines require a 500km break-in period; avoid long-time high-speed full-load operation during break-in. After break-in, replace engine oil and clean filter elements to optimize overall performance. Regularly check cooling water and engine oil levels to ensure stable operation of the liquid cooling system and extend engine service life.

Ideal for personal maxi scooter engine replacement and repair, professional motorcycle repair shop spare parts supply, factory bulk procurement, large-displacement scooter power upgrade modification, and European motorcycle parts wholesale business. Widely applicable to daily urban commuting, medium and long-distance highway touring, leisure riding and light-duty delivery scenarios, serving as the most reliable OEM replacement part for Gilera Nexus500 E3 and Aprilia Atlantic 400 owners.

• ✓ Professional liquid cooling system, stable heat dissipation, no overheating for long-distance high-speed cruising
• ✓ Strict Euro 3 E3 emission compliance, fully adapted to European market standards
• ✓ High low-end torque output, strong climbing and load-bearing capacity for maxi scooters
• ✓ Standard OEM overall size, perfect fit, zero-modification plug-and-play installation
• ✓ Mature and stable structure, ultra-low failure rate, saving long-term maintenance costs
• ✓ Full complete assembly, no extra accessories required for direct installation
• ✓ Factory direct supply, cost-effective with stable and reliable quality
• ✓ Complete pre-shipment testing and professional after-sales technical support