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4 Stroke 140CC Dirt Bike Motorcycle Engine Kit, Motor Carburetor Single Cylinder Horizontal CDI Kick Starter with 4 Speed Manual Clutch for Pit Dirt Bike Honda CRF50 CRF70 XR50 XR70 Z50 Z50R CT70
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4 Stroke 140CC Dirt Bike Motorcycle Engine Kit, Motor Carburetor Single Cylinder Horizontal CDI Kick Starter with 4 Speed Manual Clutch for Pit Dirt Bike Honda CRF50 CRF70 XR50 XR70 Z50 Z50R CT70
The engine kit boasting a maximum power of 8kw and maximum torque of 9.5N.M delivers an impressive surge of strength and control to the vehicle.
4 Stroke 140CC Dirt Bike Motorcycle Engine Kit, Motor Carburetor Single Cylinder Horizontal CDI Kick Starter with 4 Speed Manual Clutch for Pit Dirt Bike Honda CRF50 CRF70 XR50 XR70 Z50 Z50R CT70
Item #: 91379843

4 Stroke 140CC Dirt Bike Motorcycle Engine Kit, Motor Carburetor Single Cylinder Horizontal CDI Kick Starter with 4 Speed Manual Clutch for Pit Dirt

Item #: 91379843

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The engine kit boasting a maximum power of 8kw and maximum torque of 9.5N.M delivers an impressive surge of strength and control to the vehicle.
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What Stands Out

Powerful Engine
This 140CC engine delivers robust performance for dirt bikes, ensuring reliable power for thrilling off-road adventures while maintaining fuel efficiency.
Manual Clutch
Equipped with a 4-speed manual clutch, this kit offers enhanced control and responsiveness, making it perfect for riders looking to improve their skills and experience.
Wide Compatibility
Designed to fit popular Honda models like CRF50 and XR70, this engine kit provides an ideal upgrade, catering to a wide range of dirt bike enthusiasts.

Product Details

Shop 4 Stroke 140CC Dirt Bike Motorcycle Engine Kit, Motor Carburetor Single Cylinder Horizontal CDI Kick Starter with 4 Speed Manual Clutch for Pit Dirt Bike Honda CRF50 CRF70 XR50 XR70 Z50 Z50R CT70 online at a best price in Solomon Islands. B0D1PS2C21
Item Weight30 lbs (13.61 kg)

Who Should Buy?

Suitable For
  • Young Riders

    Ideal for young riders starting out in dirt biking, offering manageable power and reliability.

  • DIY Enthusiasts

    Great for hobbyists or DIY enthusiasts looking to upgrade or build their own dirt bike projects.

  • Budget-Conscious

    A cost-effective solution for those wanting a solid dirt bike engine without breaking the bank.

Not Suitable For
  • Experienced Riders

    May not satisfy experienced riders seeking high performance or advanced features in their engines.

Product Description

4 Stroke 140CC Dirt Bike Motorcycle Engine Kit, Motor Carburetor Single Cylinder Horizontal CDI Kick Starter with 4 Speed Manual Clutch for Pit Dirt Bike Honda CRF50 CRF70 XR50 XR70 Z50 Z50R CT70

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Customer Questions & Answers

  • Question: What does the 4 Stroke 140CC Dirt Bike Motorcycle Engine Kit include?

    Answer: The 4 Stroke 140CC Dirt Bike Motorcycle Engine Kit includes the engine itself, a motor carburetor, a CDI ignition system, a kick starter, and a 4-speed manual clutch. This kit is designed for compatibility with various dirt bikes such as the Honda CRF50, CRF70, XR50, XR70, Z50, Z50R, and CT70. The comprehensive nature of the kit ensures that you have all the crucial components needed for replacing or upgrading your bike’s engine, enhancing both performance and reliability on the dirt tracks.
  • Question: Is this engine kit suitable for beginners?

    Answer: Yes, the 4 Stroke 140CC engine kit is suitable for beginners. It provides a manageable power output that is ideal for new riders learning to navigate dirt bike terrain. The 4-speed manual clutch allows for smoother transitions and better control, making it easier for novices to adapt to higher speeds and varied conditions. Whether you’re exploring trails or practicing on a track, this kit enhances your learning experience in a safe and enjoyable way.
  • Question: What types of bikes can use this engine kit?

    Answer: The engine kit is compatible with several models, including Honda CRF50, CRF70, XR50, XR70, Z50, Z50R, and CT70. If you own any of these models, this engine kit can be a great enhancement for your dirt bike. Each of these bikes is designed for off-road riding, and upgrading to a 140CC engine provides added power and performance, making your rides more thrilling and engaging on rugged terrains.
  • Question: How does the 4-speed manual clutch improve performance?

    Answer: The 4-speed manual clutch allows for greater control over gear shifts, improving acceleration and handling. This feature is crucial for optimizing performance across various terrains. Riders can easily adjust their speed and power delivery according to obstacles they encounter. Whether you’re navigating steep inclines or racing on flat surfaces, the manual clutch lets you tailor your riding experience, enhancing both fun and skill development.
  • Question: Why choose a 4-stroke engine over a 2-stroke engine?

    Answer: 4-stroke engines, like this one, operate more smoothly and are generally more fuel-efficient than 2-stroke engines. They also produce fewer emissions, making them a better choice for environmentally conscious riders. Additionally, 4-stroke engines often provide a broader power band, delivering consistent power output throughout the rev range. This is particularly beneficial for off-road riding where control and precision are key.
  • Question: Can I install this kit myself, or do I need professional help?

    Answer: While experienced DIY enthusiasts may find it feasible to install the engine kit themselves, beginners might benefit from professional installation. The process involves technical skills and tools that are essential for ensuring proper assembly and function. If you're unfamiliar with dirt bike mechanics, consulting a mechanic can not only save you time but also ensure safety and longevity of your bike, providing peace of mind on every ride.
  • Question: What are the maintenance requirements for this engine kit?

    Answer: Maintaining the 4 Stroke 140CC engine kit involves regular oil changes, checking the air filter, and ensuring that all components are correctly secured. It's also essential to inspect the engine and its parts periodically for any wear or damage. Proper maintenance ensures long-lasting performance and reliability in various riding conditions. Regular checks can help prevent issues before they arise, keeping your outings enjoyable and trouble-free.
  • Question: Is there a recommended fuel type for the engine kit?

    Answer: Yes, it is recommended to use high-quality unleaded gasoline with an octane rating of at least 91 for optimal performance of the 4 Stroke 140CC engine. Using the right fuel not only enhances performance but also contributes to engine longevity. High-octane fuel helps prevent knocking and ensures that the engine runs smoothly, particularly under high stress while riding on challenging terrains.
  • Question: How does the CDI ignition system enhance performance?

    Answer: The CDI (Capacitor Discharge Ignition) system in the 4 Stroke 140CC dirt bike engine kit provides precise timing for spark delivery, resulting in efficient combustion. This feature significantly improves throttle response and overall power output. With the CDI system, riders experience a more responsive ride, especially important during quick accelerations or when navigating tricky paths. This technology ensures you get the most out of your bike in various riding conditions.
  • Question: Where can I buy the 4 Stroke 140CC Dirt Bike Motorcycle Engine Kit?

    Answer: You can purchase the 4 Stroke 140CC Dirt Bike Motorcycle Engine Kit from Ubuy, a reliable online platform that offers a range of motorcycle accessories and parts. Ubuy provides a straightforward shopping experience, making it easy to find this engine kit along with other essential items for your dirt bike. Their website offers detailed product descriptions and user reviews to aid your purchasing decision.

DDYOOK Rebuild Kits Editorial Review

The 4 Stroke 140CC Dirt Bike Motorcycle Engine Kit is designed to enhance your pit dirt bike performance, featuring a lightweight build of just 30 lbs (13.61 kg), making it an excellent choice for agile handling. This engine kit includes a motor carburetor, single cylinder, horizontal CDI, and a kick starter with a 4-speed manual clutch, which is compatible with popular models like Honda CRF50, CRF70, XR50, XR70, Z50, Z50R, and CT70. Enthusiasts appreciate its straightforward installation process and robust performance capabilities, perfect for those looking to upgrade their dirt bike with reliable power and efficiency.

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Pros

  • Lightweight design enhances maneuverability
  • Includes kick starter for easy starting
  • Compatible with various Honda models
  • 4-speed manual clutch for better control
  • Robust performance for improved bike efficiency

Cons

  • Installation may require some mechanical knowledge

Platform Trust & Buyer Confidence

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4.2/5 9477 reviews
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Jasmin
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“Great products and very good service: very easy and very fast international delivery.”

9 September 2026 · via Trustpilot
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“Wonderful online shopping experience, smooth transaction from the start. Payment method works conveniently and delivery is unexpectedly fast and reliable. You go the extra mile for service. What makes this even more amazing, you deliver to Namibia. I will remain a happy Ubuy customer and will increase my purchases for sure! Thank you!”

10 September 2026 · via Trustpilot
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“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”

10 September 2026 · via Trustpilot
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“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”

11 September 2026 · via Trustpilot
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“Easy to find and order what you want on the website. Delivery is quick to the UK”

8 September 2026 · via Trustpilot
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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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Order now and get it around Monday, October 05

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Features & Benefits

  • High-quality aluminium alloy and cast steel materials for durability.
  • Powerful engine with maximum power of 8kw and torque of 9.5N.M.
  • Simple installation with complete accessories included.
  • Designed to fit various Honda models, ensuring compatibility.
  • Ideal for cycling, motorcycles, and various motorized models.
  • Professional installation is recommended for best results.

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