---
product_id: 561543905
title: "125CC Engine Motor, 4-Stroke Semi Auto Engine for Go Kart ATV Quad Bike Buggy CDI/Air Cooling System Single-Cylinder with Reverse and 3 Forward Electrical Start"
brand: "liyuanjun"
price: "$2588512"
currency: COP
in_stock: true
reviews_count: 8
category: "Liyuanjun"
url: https://www.desertcart.co/products/561543905-125cc-engine-motor-4-stroke-semi-auto-engine-for-go
store_origin: CO
region: Colombia
---

# Electric start convenience 3 forward + reverse gears 125cc 4-stroke power 125CC Engine Motor, 4-Stroke Semi Auto Engine for Go Kart ATV Quad Bike Buggy CDI/Air Cooling System Single-Cylinder with Reverse and 3 Forward Electrical Start

**Brand:** liyuanjun
**Price:** $2588512
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your ride with precision and ease — don’t get left in the dust!

## Quick Answers

- **What is this?** 125CC Engine Motor, 4-Stroke Semi Auto Engine for Go Kart ATV Quad Bike Buggy CDI/Air Cooling System Single-Cylinder with Reverse and 3 Forward Electrical Start by liyuanjun
- **How much does it cost?** $2588512 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/561543905-125cc-engine-motor-4-stroke-semi-auto-engine-for-go)

## 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

- • **Seamless Gear Control:** 3 forward speeds plus reverse gear give you full command and versatility on any terrain.
- • **Universal Compatibility:** Fits a wide range of go-karts, ATVs, buggies, and dirt bikes from top brands like Atomik, TDR, and Zongshen.
- • **Effortless Electric Start:** Instant ignition with electric start means no more frustrating kickstarts—get going faster.
- • **Power-Packed 125cc Engine:** Robust 4-stroke single-cylinder delivers reliable 5.8 kW performance for your off-road adventures.
- • **Advanced Air-Cooled Design:** Efficient air cooling keeps your engine running smooth and cool during extended rides.

## Overview

The LIYUANJUN 125CC 4-stroke semi-auto engine is a versatile, air-cooled single-cylinder powerhouse designed for go-karts, ATVs, and buggies. Featuring 3 forward gears plus reverse, electric start, and broad brand compatibility, it delivers 5.8 kW of reliable performance with easy installation and efficient cooling—perfect for millennial thrill-seekers craving dependable off-road power.

## Description

Buy LIYUANJUN 125CC Engine Motor, 4-Stroke Semi Auto Engine for Go Kart ATV Quad Bike Buggy CDI/Air Cooling System Single-Cylinder with Reverse and 3 Forward Electrical Start: Rebuild Kits - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: The kids love it - Great little engine! Fast shipping! Got this as a replacement for one of the kids little off-brand atvs. Bolted right in. Sounds great! East to install. There was no instructions for the wiring harness so there was a little trial and error hooking it up but works great. Starter solenoid died after cranking it over less than 3 times trying to get it started for the first time but luckily I had the one off the old harness. Get a better air filter. The one in my kit was just foam and already ripped and crumpled. Oh and the shift lever is unusable in my application. I honestly don't know what it would actually work in. Lol Overall is it perfect? Nope. But I still have it 5 starts because, the shipping was really fast. Faster then expected by 3 days! Engine is nice. Sounds good. Direct bolt in replacement. Some of the accessories that came in the kit were a little chincy and unusable. Overall it's a great deal
Review: Runs like a champ! - This rating should be lower but the actual engine runs great, fit well and the price is incredible! Reason I would have rated lower is the CDI it came with did not work, luckily the old one did. The pipe from cylinder to carb had a hole casted in it rendering it useless, again, the old one worked. This could be good or bad but since I hate wiring, it was bad to me... It comes with at least twice as many wires as I needed. Again, this could be a positive for some.

## Features

- 【About Wirings】Five wires (plug) is for gear indicator; yellow wire is for storage battery; pink (or yellow) wire is for storage battery; black & red wire is for signal trigger;green wire is for grounding; blue & white is for trigger coil.
- 【Compatible with】 This 125cc engine motor is suitable for pit bike, dirt bike, buggy, pocket rocket, go-karts, atvs, track bikes, quad and so on. It fits for Atomik, for Pitpro, for TDR, for Xmoto, for Trooper, for Motox, for Trojan, for Blitz, for Raider, for Zongshen, for Chongqing, for Loncin, for Ducar and more.(For the reference)
- 【Parameters 1】Engine Size: 125cc; Gear System: 3 Forward; Neutral; Reverse; Type: Horizontal, Single-Cylinder, 4-Stroke, Air-Cooled; Start Method: Electrical Start; Bore X Stroke: 52.4 × 55.5 Mm, 119.7 Ml; Top Engine Mount: 92mm; Bottom Engine Mount: 82mm
- 【Parameters 2】Idle speed: 1500 r/min±100r/min; Front sprocket: 428 - 14T; Ignition: CDI; Air Filter: 35mm; Carburetor: PZ19; Lubrication: Pressure/splash; Oil capacity: 900ml/0.23gal; Maximum torque/ rpm: 8.5 N.m/5000r/min±250 r/min
- 【Warm Note】Please note that the machine originally has oil, but the machine still needs add oil before it can start. Gasoline and engine oil volume mixing ratio, running-in period 25:1, late running-in period 30:1

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CFKLNFF1 |
| Best Sellers Rank | #118,658 in Automotive ( See Top 100 in Automotive ) #38 in Powersports Engine Kits |
| Brand | LIYUANJUN |
| Brand Name | LIYUANJUN |
| Customer Reviews | 4.2 out of 5 stars 77 Reviews |
| Horsepower | 5.8 Kilowatts |
| Manufacturer | LIYUANJUN |

## Product Details

- **Brand:** LIYUANJUN
- **Horsepower:** 5.8 Kilowatts
- **Manufacturer:** LIYUANJUN

## Images

![125CC Engine Motor, 4-Stroke Semi Auto Engine for Go Kart ATV Quad Bike Buggy CDI/Air Cooling System Single-Cylinder with Reverse and 3 Forward Electrical Start - Image 1](https://m.media-amazon.com/images/I/71ZeWk9LjuL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ The kids love it
*by L***A on March 20, 2025*

Great little engine! Fast shipping! Got this as a replacement for one of the kids little off-brand atvs. Bolted right in. Sounds great! East to install. There was no instructions for the wiring harness so there was a little trial and error hooking it up but works great. Starter solenoid died after cranking it over less than 3 times trying to get it started for the first time but luckily I had the one off the old harness. Get a better air filter. The one in my kit was just foam and already ripped and crumpled. Oh and the shift lever is unusable in my application. I honestly don't know what it would actually work in. Lol Overall is it perfect? Nope. But I still have it 5 starts because, the shipping was really fast. Faster then expected by 3 days! Engine is nice. Sounds good. Direct bolt in replacement. Some of the accessories that came in the kit were a little chincy and unusable. Overall it's a great deal

### ⭐⭐⭐⭐ Runs like a champ!
*by M***0 on December 4, 2025*

This rating should be lower but the actual engine runs great, fit well and the price is incredible! Reason I would have rated lower is the CDI it came with did not work, luckily the old one did. The pipe from cylinder to carb had a hole casted in it rendering it useless, again, the old one worked. This could be good or bad but since I hate wiring, it was bad to me... It comes with at least twice as many wires as I needed. Again, this could be a positive for some.

### ⭐⭐⭐⭐⭐ Easy
*by K***A on August 16, 2025*

Kids love being able to ride their bike again! Came as it was described good quality at a great price. Super easy install!

## Frequently Bought Together

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*Product available on Desertcart Colombia*
*Store origin: CO*
*Last updated: 2026-02-07*