- Home Page /
- Automotive /
- Motorcycle & Powersports /
- Parts /
- Engine /
- Rebuild Kits /
- 140CC 4-Stroke Racing Engine for Honda CRF50C...
0 ratings
Item #:
109388362
140CC 4-Stroke Racing Engine for Honda CRF50CRF70 XR50XR70 Z50Z50R Pit Dirt Bikes - Horizontal Single Cylinder, 4-Speed Manual Clutch, CDI Kick
Item #:
109388362
0 ratings
Write a review
Out of stock
Imported from USA store
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
Upgrade your ride with a trusted, high-performance engine today!
Fast
Shipping
Free
Return*
Secure Packaging
100% Original Products
PCI DSS Compliance
ISO 27001 Certified
Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
High Performance Engine
This 140CC 4-stroke engine delivers superior performance, enhancing speed and acceleration, making it ideal for racing and recreational riding on Honda CRF and XR models.
Durable Build Quality
Crafted with robust materials, this engine ensures longevity and reliability under extreme conditions, providing peace of mind during intense rides.
User-Friendly Operation
Equipped with a 4-speed manual clutch and CDI kick starter, this engine offers an intuitive riding experience, making it accessible for both beginners and experienced riders.
Product Details
| Item Weight | 18 lbs (8.16 kg) |
Who Should Buy?
-
Racing Enthusiasts
Ideal for riders looking to upgrade their pit bikes for better performance in racing scenarios.
-
Beginner Riders
Perfect for beginners transitioning to manual clutch systems, enhancing their riding skills on dirt bikes.
-
Custom Builders
Great for those customizing their Honda CRF50/CRF70 and similar models, offering a performance boost.
-
Casual Riders
Not suitable for casual users who seek simple, hassle-free riding experiences without complex setups.
-
Younger Children
Inappropriate for very young riders due to its power and manual clutch requirements that demand more skill.
-
Non-Competitive Users
Not ideal for users who do not intend to race or maximize the performance of their pit bikes.
Product Description
140CC 4-Stroke Racing Engine for Honda CRF50CRF70 XR50XR70 Z50Z50R Pit Dirt Bikes - Horizontal Single Cylinder, 4-Speed Manual Clutch, CDI Kick Starter
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What are the key specifications of the 140CC 4-Stroke Racing Engine?
Answer: The 140CC 4-Stroke Racing Engine features a horizontal single cylinder design along with a 4-speed manual clutch and CDI kick starter. This engine is optimized for performance in pit dirt bikes, particularly models like Honda CRF50/CRF70 and XR50/XR70. The 4-stroke configuration ensures quieter operation and improved fuel efficiency, making it ideal for both racing and recreational use. -
Question:
Is the engine compatible with all dirt bike models?
Answer: While designed primarily for Honda models such as CRF50, CRF70, XR50, and XR70, the 140CC 4-Stroke Racing Engine may also fit other dirt bikes with similar specifications. Compatibility depends on the bike’s frame and existing engine mounting points. It’s advisable to check your specific dirt bike model’s dimensions and requirements before proceeding with the installation. -
Question:
What advantages does a 4-stroke engine have for racing?
Answer: A 4-stroke engine, like the 140CC Racing Engine, offers several benefits including enhanced torque and better throttle response. Compared to 2-stroke engines, 4-strokes provide improved fuel efficiency and emissions reduction, making them cleaner and more suitable for competitive racing environments. Riders can enjoy longer rides without frequent refueling, which is beneficial during races or extended off-road journeys. -
Question:
How do I install the 140CC 4-Stroke Racing Engine in my dirt bike?
Answer: To install the 140CC engine, first remove the existing engine from your dirt bike. Ensure you have the appropriate tools at hand. Follow the manufacturer's installation instructions, including fitting the engine into the frame securely and connecting the wiring harness for the CDI. Once installed, perform a thorough inspection to ensure everything is aligned properly before your first test ride to guarantee optimal performance. -
Question:
What type of maintenance does this engine require?
Answer: Regular maintenance for the 140CC 4-Stroke Racing Engine includes oil changes, checking the air filter, and inspecting the spark plug. It’s crucial to keep the engine clean and well-lubricated to ensure optimal performance and longevity. Additionally, periodic checks on the clutch and transmission can prevent potential issues during racing or trail riding. -
Question:
What kind of fuel is best for the 140CC Racing Engine?
Answer: For the 140CC 4-Stroke Racing Engine, it is recommended to use high-octane unleaded gasoline. Higher octane fuel prevents knocking and promotes better combustion efficiency, which can significantly affect performance and throttle response. Proper fuel choice enhances engine longevity and helps maintain peak performance during rides and races. -
Question:
How does the CDI system enhance engine performance?
Answer: The CDI (Capacitor Discharge Ignition) system in the 140CC 4-Stroke Racing Engine provides precise timing for spark delivery, which is crucial for improving engine efficiency and performance. This system allows quicker ignition and smoother acceleration, resulting in a more responsive ride, especially in racing conditions. For enthusiasts, a CDI system can make a tangible difference in overall performance. -
Question:
Can I upgrade my existing dirt bike to a 140CC engine?
Answer: Yes, upgrading your dirt bike to a 140CC 4-Stroke engine can significantly enhance its performance. However, ensure that your chassis can accommodate the engine size and dimensions. It’s important to consider compatibility with other components, such as gearing and brakes, to manage the increased power effectively. This upgrade is popular among riders looking for enhanced speed and acceleration. -
Question:
Is this engine suitable for beginners?
Answer: While the 140CC 4-Stroke Racing Engine offers excellent performance, it may present a challenge for absolute beginners due to its power and speed capabilities. It is advisable for novice riders to start with smaller engines before transitioning to a 140CC engine to build confidence and control. That said, with proper training and guidance, it can be a rewarding option for those transitioning to more powerful bikes. -
Question:
Where can I buy the 140CC 4-Stroke Racing Engine?
Answer: You can buy the 140CC 4-Stroke Racing Engine from Ubuy in Grenada. Ubuy offers a wide selection of quality engines suitable for various dirt bike models, including the one you are looking for. By purchasing through Ubuy, you can benefit from reliable service and various options tailored to meet your specific needs for racing.
Borutools Rebuild Kits Editorial Review
No editorial reviews found
Customer Reviews & Ratings
1 customers ratings
-
5 Star
100%
-
4 Star
0%
-
3 Star
0%
-
2 Star
0%
-
1 Star
0%
Review this product
Share your thoughts with other customers
Platform Trust & Buyer Confidence
MT
Mohd
Verified buyer
“The product received very good packaging & safe…Thank You”
16 June 2026 · via Trustpilot
SJ
Shawati
Verified buyer
“Accurate delivery timing given”
16 June 2026 · via Trustpilot
YB
Youcef
Verified buyer
“Not madly expensive like I thought, and much quicker than promised.”
15 June 2026 · via Trustpilot
LM
Leila
Verified buyer
“Never dealt with Ubuy before, but everything worked out great. Seamless cross border purchasing and shipping. Thanks!”
6/7/2026 · via Trustpilot
KA
Kwame
Verified buyer
“The process was smooth, with clear communication and timelines. This was my 1st purchase and I am really impressed. I will definitely be coming back.”
12 June 2026 · via Trustpilot
Secure Checkout
Global Delivery
Easy Returns
Genuine Products
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.
- Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.
Currently unavailable.
We don't know when or if this item will be back in stock.
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.)
Secured transaction
PCI DSS compliant and ISO 27001:2022 certified, with encrypted payments and full buyer protection on every order.
Our Top Logistics Partners
Fastest cross-border delivery
Features & Benefits
- Includes complete package for easy setup and quick installation.
- Compatible with popular Honda models including CRF50, CRF70, XR50, XR70, and more.
- Offers powerful 140cc performance with 8kW max power and 9.5N.m torque.
- Designed with premium materials for durability and reliability.
- Factory-quality engine manufactured to original specs for optimal performance.
- Perfect for mini bikes and classic restorations.
Ubuy Assurance
Experience worry-free shopping with 100% original products, PCI DSS-compliant payment security, ISO 27001-certified data protection, the fastest cross-border delivery, free returns *, and secure packaging on every order.