--- product_id: 548658590 title: "125CC 4-Stroke Engine Motor Kit, Single Cylinder Air-Cooled Motor Engine for Honda CRF50 XR50 CRF70 Z50R QR50 Dirt Pit Bike, Engine Kit with Manual Clutch and PZ22 Carburetor" brand: "liyuanjun" price: "£195.59" currency: GBP in_stock: true reviews_count: 8 category: "Liyuanjun" url: https://www.desertcart.co.uk/products/548658590-125cc-4-stroke-engine-motor-kit-single-cylinder-air-cooled store_origin: GB region: United Kingdom --- # 6.5 kW max power output 125cc displacement power 4-speed manual clutch control 125CC 4-Stroke Engine Motor Kit, Single Cylinder Air-Cooled Motor Engine for Honda CRF50 XR50 CRF70 Z50R QR50 Dirt Pit Bike, Engine Kit with Manual Clutch and PZ22 Carburetor **Brand:** liyuanjun **Price:** £195.59 **Availability:** ✅ In Stock ## Summary > ⚡ Power your passion with precision and control! ## Quick Answers - **What is this?** 125CC 4-Stroke Engine Motor Kit, Single Cylinder Air-Cooled Motor Engine for Honda CRF50 XR50 CRF70 Z50R QR50 Dirt Pit Bike, Engine Kit with Manual Clutch and PZ22 Carburetor by liyuanjun - **How much does it cost?** £195.59 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/548658590-125cc-4-stroke-engine-motor-kit-single-cylinder-air-cooled) ## Best For - liyuanjun enthusiasts ## Why This Product - Trusted liyuanjun brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Cool & Efficient:** Air-cooled design combined with CDI ignition ensures optimal engine temperature and fuel economy during extended rides. - • **Ultimate Control:** 4-speed manual clutch transmission offers precise gear shifting to conquer diverse terrains with confidence. - • **Ready for Your Build:** Comprehensive kit includes kick starter, gear shift lever, carburetor, and more — everything you need to upgrade your mini dirt bike. - • **Precision Power Delivery:** 125cc single-cylinder 4-stroke engine delivers reliable and efficient performance for your rebuild projects. - • **Smooth & Responsive Ride:** PZ22 carburetor optimizes air-fuel mix for consistent throttle response and enhanced fuel efficiency. ## Overview The LIYUANJUN 125CC 4-Stroke Engine Motor Kit is a robust, air-cooled single-cylinder engine designed for mini dirt bikes like Honda CRF50 and XR50. Featuring a 6.5 kW max power output, a fuel-efficient PZ22 carburetor, and a 4-speed manual clutch transmission, it delivers smooth throttle response and precise control. The CDI ignition and air-cooling system ensure reliable starts and prevent overheating, making it an ideal upgrade for enthusiasts seeking performance and durability in their rebuild projects. ## Description Product description This engine fits for HONDA CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Z50 / Minitrail Monkey / XL70 ST70 / QA50 / QR50 / CL70 / SL70 / 70 Passport / ST 90K2 / ST 90K1 / CS 90 / SL 90 / ZB 50. Please note this is for reference only, if you are unsure, please ask your local dealer. The 125CC engine uses premium aluminum cylinder head and solid iron cylinder block, which can be used stable in various environments, resulting you in a smooth ride. The engine has clear wiring helping you install and operate. The air-cooling system efficiently dissipates heat, ensuring a cool performance for a smooth and enduring adventure. The engine's 4-speed, manual clutch transmission provides you with precise control over gear changes, allowing you to adapt to various road conditions and terrain. Specification Parameters Carburetor Type: PZ16J Primary Reduction Ratio:3.722 Gear Ratio:2.833/1.706/1.238/0.958 Lubricant Capacity: 900 ml Lubricant: SAE15W/40-SE Note Only the wiring provided in the picture, no other wiring harness is included. Installation manual not included, professional installation highly recommended. Color difference in the pictures due to manual shooting. Package includes 1x 125CC Engine 1x Kick Starter Lever 1x Gear Shift Lever 1x Carburetor 1x Intake Manifold 1x CDI 2x Intake Gaskets Review: Great service - Motor is solid but the seller is a rockstar at customer service .. i had a issue with install . I was frustrated and they talked me through it in the contact seller tab.. im shocked they were able to help based on my description.. but it did the trick and now im scooting around fat and happy. Will buy again on future projects ! Review: Good little engine - Bought this for our four wheeler. It fit perfectly and runs good. It was delivered two days early which was awesome! As described and no issues so far. ## Features - 【What You Will Get】Here 1x 125cc 4 stroke engine, 1x kick starter lever, 1x gear shift lever, 1x carburetor, 1x intake manifold, 1x cdi, 2x intake gaskets are included in the package. The carefully calibrated PZ22 carburetor optimizes the air-fuel mixture, enhancing fuel efficiency and providing a consistent and responsive throttle response, resulting you in a smooth and enjoyable ride. - 【Main Parameters】Fuel Consumption: ≤367g/kw.h; Displacement: 125cc; Start Mode: Kick starter; Lubrication: SAE15W/40-SE, 4-stroke gasoline engine oil; Compression ratio: 9.0:1 Transmission: 4-speed, Manual clutch; Primary Reduction Ratio: 3.722; Clutch: Wet multi-plate; Max Power: 6.5 kW/7500r/min±375r/min; Spark Plug: A7TC; Carburetor Type: PZ22 - 【Compatible With】This engine fits for HONDA CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Z50 / Minitrail Monkey / XL70 ST70 / QA50 / QR50 / CL70 / SL70 / 70 Passport / ST 90K2 / ST 90K1 / CS 90 / SL 90 / ZB 50. Please note this is not a guarantee, if you are unsure, please ask your local dealer. - 【Precise Control】The engine's 4-speed, manual clutch transmission provides you with precise control over gear changes, allowing you to adapt to various road conditions and terrain, resulting in a more engaging and customized riding experience. Manual transmissions tend to be less expensive to manufacture and maintain than automatic transmissions, which can lead to cost savings for you. - 【CDI Ignition& Air Cooling】This 125cc engine motor adopts CDI ignition which optimizes the timing and intensity of sparks and enhances fuel efficiency. The engine's air-cooled design ensures a cool performance. The air-cooling system efficiently dissipates heat, preventing overheating during prolonged rides and maintaining optimal engine temperature for a smooth and enduring adventure. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CD2F712S | | Best Sellers Rank | #39,922 in Automotive ( See Top 100 in Automotive ) #2,018 in Powersports Parts | | Brand | LIYUANJUN | | Brand Name | LIYUANJUN | | Customer Reviews | 4.2 out of 5 stars 66 Reviews | | Included Components | 125CC 4-Stroke Engine Motor | | Item Type Name | 125CC 4-Stroke Engine Motor | | Manufacturer | LIYUANJUN | | Model | 125CC 4-Stroke Engine Motor | | Model Name | 125CC 4-Stroke Engine Motor | | Number of Items | 1 | | Part Number | AC-YCZYQ-1495 | | Warranty Description | 125CC 4-Stroke Engine Motor | ## Product Details - **Brand:** LIYUANJUN - **Manufacturer:** LIYUANJUN - **Model Name:** 125CC 4-Stroke Engine Motor ## Images ![125CC 4-Stroke Engine Motor Kit, Single Cylinder Air-Cooled Motor Engine for Honda CRF50 XR50 CRF70 Z50R QR50 Dirt Pit Bike, Engine Kit with Manual Clutch and PZ22 Carburetor - Image 1](https://m.media-amazon.com/images/I/61wm1k3A-WL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Is it fix Honda atc70?** A: Dear customer, this product is suitable for honda atc70, hope this can help you! **Q: Whats the wiring diagram?** A: Dear customer, It is our pleasure to answer your questions. At present, we have updated the wiring diagram picture in real time, and you can see the product wiring diagram. Hope this helps you! If you have any problems, contact me freely at any time, we will try our best to solve your problems. Good wishes! ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great service *by L***N on April 23, 2026* Motor is solid but the seller is a rockstar at customer service .. i had a issue with install . I was frustrated and they talked me through it in the contact seller tab.. im shocked they were able to help based on my description.. but it did the trick and now im scooting around fat and happy. Will buy again on future projects ! ### ⭐⭐⭐⭐⭐ Good little engine *by C***A on May 13, 2026* Bought this for our four wheeler. It fit perfectly and runs good. It was delivered two days early which was awesome! As described and no issues so far. ### ⭐⭐⭐⭐ I mean it’s okay *by J***R on April 3, 2026* Don’t get me wrong, a 125cc 4 speed motor for 250$ sounds like a good deal and I bought this for my blow up Kandi 125 and when the engine arrived I installed it and it worked good but the clutch actuator would not return back down so it made me have to do some adjustments but I didn’t know that, that was the problem at first because I thought it was my cable so after 60$ in replacement cables I finally adjusted the clutch actuator and now the engines shifts good but sometimes the clutch will slip when rolling in 1st or 2nd and randomly shift into neutral which is werid and the motor vibrates.. ALOT so I will be buying some rubber bushing onto some motor mounts but other than the clutch problems, the engines runs pretty good and pushes a pretty good amount of power. ## Frequently Bought Together - LIYUANJUN 125CC 4-Stroke Engine Motor Kit, Single Cylinder Air-Cooled Motor Engine for Honda CRF50 XR50 CRF70 Z50R QR50 Dirt Pit Bike, Engine Kit with Manual Clutch and PZ22 Carburetor - HIAORS 7/8 Inch Handlebar Left Clutch Lever and Clutch Cable with Adjuster Compatible with 50cc 70cc 90cc 110 cc 125cc Tao Tao SSR Pit Dirt Motor Bike Black - LAXEEM Wire Harness Wiring Loom CDI Ignition Coil Spark Plug Rebuild Kit for 50cc 70cc 90cc 110cc 125cc Stator CDI Coil ATV Quad Bike Buggy Go Kart --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/548658590-125cc-4-stroke-engine-motor-kit-single-cylinder-air-cooled](https://www.desertcart.co.uk/products/548658590-125cc-4-stroke-engine-motor-kit-single-cylinder-air-cooled) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-11*