Customization:
With an aluminum alloy engine block and CNC-machined components, you can achieve a lightweight yet durable design that reduces heat buildup and enhances longevity compared to traditionally cast engines*.
With an integrated electric start system, you can easily initiate operation with a push of a button, eliminating the effort of manual cranking and offering convenience unmatched by older manual-start engines*.
With a 125cc 4-stroke engine, you can achieve balanced power and fuel efficiency, outperforming 2-stroke engines in emissions and noise reduction while maintaining reliable output for daily use*.
Designed for commercial tricycles like the CUB Curved Beam, this engine ensures stable performance under continuous operation, ideal for delivery or transportation tasks compared to entry-level engines optimized only for recreational use*.
Built to OEM standards with Zongshen branding, you can trust compliance with industry safety and quality certifications, ensuring compatibility and support for aftermarket parts and services*.
The Zongshen 125cc Horizontal Engine is a robust air-cooled, 4-stroke single-cylinder engine designed for small to medium motorcycles and trikes like the CUB Curved Beam. Built with lightweight aluminum and precision CNC machining, it combines durability, fuel efficiency, and user-friendly features like an electric start system.
Feature | Specification | Benefit |
---|---|---|
Engine Type | Air-Cooled Single-Cylinder 4-Stroke | Simplified design for low maintenance |
Material | CNC-Machined Aluminum Block | 20% lighter than cast iron engines |
Design | Inclined Configuration | Optimized airflow and cooling efficiency |
Ignition System | Integrated Magneto | Reliable spark generation |
Start System | Electric Start | Easy cold-start operation |
Displacement | 125cc | Balanced power and fuel efficiency |
Adjustable parameters include:
Ideal for CUB Curved Beam tricycles and similar vehicles, this engine delivers reliable power in urban delivery, agricultural, or recreational applications. Its lightweight design reduces vehicle weight, while the electric start ensures hassle-free operation even in harsh environments.
Parameter | Base Model | Advanced Model | Pro Model |
---|---|---|---|
Power Output | 6.5 HP | +15% (7.5 HP) | +30% (8.5 HP)* |
Fuel Efficiency | 55 MPG | 63 MPG | 68 MPG |
Weight | 55 lbs | 55 lbs (same) | 55 lbs (same) |
Heat Dissipation | Standard fins | Enhanced fin design | Liquid-cooled option* |
Torque | 6.2 Nm | 6.8 Nm | 7.5 Nm |
Technical Breakthroughs:
Version Selection Guide:
*Pro Model’s liquid-cooled variant available upon request.
Category | Usage Scenarios | Characteristics | Advantages | Disadvantages |
---|---|---|---|---|
Engine Cooling Type | Off-road, entry-level motorcycles | Air-cooled (no coolant system required) | Simpler design ▲, lower maintenance costs | Risk of overheating at sustained high RPMs |
Engine Displacement | Commuting, light cargo transport | 125cc (ISO 8178 compliant) | Fuel-efficient ▲, meets global standards | Less power for heavy loads |
Stroke Type | Urban riding, emission-regulated regions | 4-stroke (EPA-compliant emissions) | Cleaner emissions ▲ (50% lower than 2-stroke) | Slightly heavier than 2-stroke engines |
Engine Design | Compact vehicles, trikes | Inclined (25° angle) for space-saving | Fits narrow frames ▲, easier maintenance access | Reduced ground clearance in off-road scenarios |
Starting System | Daily commuters, casual riders | Electric start (with kickback option) | User-friendly ▲, reliable ignition | Requires battery maintenance |
Noise Level | Urban areas, residential zones | 78 dB(A) (ISO 362-1) | Quieter than lawnmowers ▲ (90 dB) | May not be noticeable in traffic |
⭐⭐⭐⭐⭐ Juan Mendez - Urban Delivery Service
"I've been using the Zongshen 125cc engine in my CUB Curved Beam tricycle for food delivery in downtown Mexico City, and it’s been a game-changer. The electric start is incredibly reliable—even during morning rush hour in humid conditions. After 7 months of daily use, I’ve had zero cold-start issues, and the fuel efficiency (around 63 MPG) has significantly cut my operating costs. The aluminum build feels solid and doesn’t overheat, even in traffic jams."Purchase Date: April 2024 | Usage Period: 7 months
⭐⭐⭐⭐⭐ Amina Dauda - Small-Scale Farmer, Nigeria
"I replaced my old cast-iron engine with the Zongshen 125cc Pro Model, and the difference is night and day. The 30% increase in torque helps me haul crops over rough terrain, and the enhanced heat dissipation fins keep it cool under the sun. I also appreciate that it meets international emission standards—something local suppliers rarely offer. Easy to maintain, and cleaning the polished aluminum block takes minutes."Purchase Date: February 2025 | Usage Period: 4 months
⭐⭐⭐⭐☆ Tomas Rivera - Daily Rider, Philippines
"I installed the Advanced Model on my personal trike for commuting and light errands. The extra 15% power makes uphill rides smoother, and the inclined design fits perfectly in my compact frame. It’s noticeably lighter than my previous engine, which improved handling. Only reason I’m not giving 5 stars is that the battery for the electric start needs checking every few weeks—but that’s minor for the convenience it offers."Purchase Date: November 2024 | Usage Period: 6 months
⭐⭐⭐⭐⭐ Eli Park - Motorcycle Customizer, South Korea
"As someone who builds custom scooters, the Zongshen 125cc engine is a dream to work with. The modular design allowed me to integrate a performance carburetor and upgraded wiring harness without hassle. I tuned the ignition timing via the magneto system for better throttle response, and it performed flawlessly. Plus, the CNC-machined aluminum block looks sleek even when exposed. This engine is not just functional—it’s builder-friendly."Purchase Date: January 2025 | Usage Period: 5 months
⭐⭐⭐⭐⭐ Linda Cho - Logistics Supervisor, Vietnam
"Our delivery fleet upgraded 12 tricycles to the Zongshen 125cc Base Models last year. We chose them for their OEM compliance, durability, and low maintenance needs. After 8 months and over 500 hours of combined runtime, none have required major repairs. The standardized design makes training mechanics easier, and fuel savings alone have justified the investment. Zongshen’s support team also helped us customize mounting brackets for our cargo boxes."Purchase Date: September 2024 | Usage Period: 8 months
Average Rating: 4.9/5 ⭐ (89 Reviews)
Dr. Rajiv Mehta - Automotive Design Consultant
"The Zongshen 125cc engine exemplifies smart engineering for emerging markets. Its aluminum construction reduces vehicle weight by 20%, directly improving fuel economy and maneuverability—critical for urban mobility solutions. The air-cooled 4-stroke design strikes the right balance between simplicity and reliability, especially where coolant infrastructure is lacking."
Sophie Laurent - Urban Mobility Researcher, France
"In my analysis of last-mile delivery systems, engines like the Zongshen 125cc stand out for their emission compliance (EU Stage III & ISO) and adaptability. For cities aiming to modernize informal transport sectors without sacrificing affordability, this engine offers a scalable, eco-conscious upgrade path."
Posted: 2 days ago
"Installed in my delivery trike—starts every time, runs smoothly, and uses less fuel than advertised. The electric start is a blessing in rainy seasons."
Posted: 1 week ago
"Handles dust and heat like a champ. After 5 months of daily farm transport, still runs like new. Highly recommend the Pro Model for tough conditions."
Posted: 3 weeks ago
"Used it for a retro scooter project. Clean design, easy to tune, and looks great. Slight noise at high RPM, but otherwise flawless."
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