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Item #:
78146560
125cc 4 Stroke Engine Motor, Electric Start Semi-Auto Engine Motor w/Reverse, 3 Speed Single Cylinder Air-Cooling ATV Quad Complete Kit, Dirt Bike
Item #:
78146560
IQD 676952
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
In stock
Imported from USA store
QTY:
Order now and get it around Friday, July 03
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The bicycle motor kit are more stable, reliable and quieter than two-stroke engines. At the same time, the 56mm bore cylinders increase load carrying capacity and lower operating temperatures, making them easier to start while providing continuous output over a range of speeds.
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Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
Versatile Conversion
Easily transforms a standard bicycle into a motorized vehicle, providing an economical and efficient way to enhance commuting and recreational biking experiences.
Powerful Performance
The 100CC 4-stroke engine ensures smooth acceleration and reliable power delivery, significantly improving the bike's range and performance compared to typical pedal-only bicycles.
User-Friendly Installation
Designed for straightforward assembly, the kit includes all necessary components, allowing users to enjoy motorized biking with minimal technical skills and tools.
Product Details
- 【Power Parameter】: Compression ratio : 9.0: 1. Maximum net power/ rpm : 5.8 kw/ 7500r/ min±375 r/ min. Maximum torque/ rpm : 8.5 N.m/5000r/min±250 r/min. Idle speed : 1500 r/min±100r/min. Front sprocket : 428-14T. Ignition : CDI. Air Filter : 35mm. Carburetor : PZ19. Starter : Kick starter. Oil capacity : 900ml.
- 【125CC Electric Motor】: This is a 4-stroke electric start semi-auto motor engine, very suitable for bicycles, Dirt bikes, karting, etc. With this engine kit, you can transform your bicycle and kart to your liking.
- 【Excellent Performance】: Engine Size: 125cc; gear system: 3 forward, neutral, reverse; type: horizontal single-cylinder, air-cooled; start method: electrical start; bore x stroke: 52.4 × 55.5 mm, 119.7 ml; air filter: 35mm.
- 【Wiring Usage】: Five wires (plug): for gear indicator; yellow wire: for battery; pink (or yellow) wire: for battery; black and red wires: for signal triggering; green wire: for Ground; blue and white: used to trigger the coil
- 【Fits (For the reference)】: 125cc 4 stroke engine is suitable for go kart, quad, dirt bike, ATV, pit bike, dirt bike, buggy, pocket rocket, etc.
| Brand Name | Rosyouth |
| Model Name | 125cc 4 Stroke Engine Motor |
| Model | 125cc 4 Stroke Engine Motor |
| Manufacturer | Rosyouth |
| Part Number | 125cc 4 Stroke Engine Motor |
| Included Components | Wiring+ Carby+Airfilter+ Chain case + Gasket |
| Item Type Name | 125cc 4 Stroke Engine Motor |
| Brand | Rosyouth |
| Number of Items | 1 |
| Item Weight | 15 lbs (6.8 kg) |
What's in the box
Wiring+ Carby+Airfilter+ Chain case + Gasket
Who Should Buy?
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Commuters
Ideal for daily commuters seeking a cost-effective and efficient alternative to traditional electric bicycles or scooters.
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DIY Enthusiasts
Perfect for hobbyists wanting to convert standard bicycles into gasoline-powered models for unique and personalized rides.
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Low Budget Riders
Great for budget-conscious individuals needing an economical way to travel longer distances without investing in a new vehicle.
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Environmentally Focused
Not suitable for users prioritizing eco-friendly transportation due to its gasoline consumption and emissions.
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New Cyclists
May overwhelm beginners unfamiliar with mechanical systems and maintenance required for a motorized bicycle setup.
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Performance Seekers
Not ideal for high-performance riders looking for speed and efficiency, as it may lack power compared to dedicated scooters.
Product Description
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Customer Questions & Answers
-
Question:
What is included in the 100CC 4-Stroke Bicycle Engine Kit?
Answer: The 100CC 4-Stroke Bicycle Engine Kit typically includes the engine, mounting hardware, a carburetor, exhaust pipe, fuel tank, and a clutch. These components are essential for integrating the engine with your bicycle, providing a smooth and efficient conversion from manual to motorized power. The detailed instructions provided in the kit ensure straightforward installation. For those looking to enhance their bicycle experience for commuting or recreational riding, this kit is perfect, allowing for improved speed and ease of travel. -
Question:
Is the 100CC engine suitable for all bicycle types?
Answer: While the 100CC engine can be adapted to a variety of bicycles, it is most compatible with standard mountain and cruiser bikes with a sturdy frame. Ensure your bike can support the weight and power of the engine. If you own a lightweight racing bike or a foldable bike, modifications may be necessary. For best results, consider a bike with a sturdy design to handle the added force and maintain stability during operation, making your rides quicker and more enjoyable. -
Question:
How fast can I expect to go with the 100CC engine?
Answer: Users can typically reach speeds of 20-35 mph (32-56 km/h) with a 100CC 4-stroke engine, depending on bike type, terrain, and rider weight. This moderate speed range makes it an ideal option for urban commutes or leisurely rides. The balance of power and efficiency allows riders to navigate city streets effectively while enjoying the benefits of motorized assistance, reducing fatigue during longer journeys or hilly terrains. -
Question:
What kind of maintenance does the engine require?
Answer: Regular maintenance for a 100CC 4-Stroke engine includes oil changes, air filter cleaning, and spark plug inspections. It’s vital to keep the engine clean and ensure the cooling system is functioning properly to optimize performance. Performing routine checks directly correlates with the engine’s longevity and efficiency. Adopting a maintenance schedule can significantly enhance the riding experience, providing reliable performance and minimizing unexpected repairs. -
Question:
Can I install the engine kit myself?
Answer: Yes, many users are able to install the 100CC 4-Stroke Bicycle Engine Kit themselves with basic tools and some mechanical knowledge. The kit usually includes a comprehensive instruction manual that simplifies the installation process. For those who enjoy DIY projects or want to save on installation costs, this can be a rewarding experience. However, if you are unsure, seeking assistance from a professional bike mechanic can ensure proper installation and safety on the road. -
Question:
Does the engine comply with environmental regulations?
Answer: Yes, the 100CC 4-Stroke engine is designed to meet various environmental regulations due to its fuel efficiency and lower emissions compared to 2-stroke engines. This makes it a more eco-friendly choice for motorizing your bike, which is important for environmentally conscious riders. Utilizing such technology allows cyclists to enjoy motorized rides while reducing their carbon footprint, aligning with sustainable riding practices. -
Question:
What fuel does the engine require?
Answer: The 100CC engine typically requires unleaded gasoline mixed with 4-stroke engine oil for optimal performance. This blend ensures proper lubrication and engine protection, reducing wear and tear. Users should follow the manufacturer’s guidelines for the right oil-to-gas ratio to ensure longevity and efficiency. This mixture not only guarantees smooth operation but also improves the overall reliability of the engine for daily use or long-distance rides. -
Question:
Can I use my bike's existing brakes with the engine?
Answer: Yes, the existing brake system of most bicycles can be retained when using the 100CC engine kit. However, it's advisable to upgrade to stronger brakes if you're using the kit on a lighter bike or plan to ride at higher speeds. This ensures better stopping power and safety during rides. Adequate braking control is crucial, particularly when managing increased speeds or navigating steep descents. -
Question:
Do I need a license to operate a motorized bicycle?
Answer: Laws regarding the use of motorized bicycles vary by location. In many areas, a 100CC motorized bike may require registration and a license, similar to a moped or scooter. It's essential to check local regulations to ensure compliance for safe and legal riding. Understanding these regulations can prevent fines and enhance your awareness of local road rules, ensuring a responsible riding experience. -
Question:
Where can I buy the 100CC 4-Stroke Bicycle Engine Kit in BG?
Answer: You can purchase the 100CC 4-Stroke Bicycle Engine Kit from Ubuy, which is a reliable e-commerce platform offering a variety of engine kits and accessories. Ubuy provides convenient delivery options and customer support to assist with your purchase. Whether you're looking for a complete kit or specific components, Ubuy makes it easy to find what you need for transforming your bicycle into a motorized vehicle.
Rosyouth Rebuild Kits Editorial Review
In the market for a 125cc 4 stroke engine motor? The 125cc 4 Stroke Engine Motor offers an electric start, semi-auto engine with reverse, and a 3-speed single-cylinder air-cooling ATV quad engine motor complete kit. The kit comes equipped with a clutch, making it suitable for adult bikes with 26-inch frames, mountain bikes, road bikes, and more. The 110cc semi-auto engine motor can be operated through electric or kick start. This makes it an excellent choice for those seeking a convenient and adaptable outdoor motor solution.
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Pros
- Electric start and kick start options
- Semi-auto engine with reverse
- Suitable for various bike types and sizes
Top selling Bicycle Engine Kit in New Zealand
Last Updated on June 6, 2026
Product Price History
Important information
- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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IQD 676952
Order now and get it around Friday, July 03
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
QTY:
Secured transaction
Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.
Our Top Logistics Partners
Fastest cross-border delivery
Features & Benefits
- Stable, reliable, and quieter than two-stroke engines
- 56mm bore cylinders increase load carrying capacity and lower operating temperatures
- Max speed of 3600 rpm for great efficiency and convenience
- Made of high-performance aluminum alloy body and durable plastic engine casing
- Forced air-cooling system for good heat dissipation and extended service life
- Complete engine kit with all needed hardware for easy upgrade of traditional bicycles