---
product_id: 90013679
title: "TDPRO 4-Stroke 125cc Semi-Auto Single-Cylinder Air-Cooled Electric-Start Motor Engine & Wiring Harness Kit for ATV Quad Four Wheelers"
brand: "tdpro"
price: "A$4160"
currency: AUD
in_stock: true
reviews_count: 6
category: "Tdpro"
url: https://www.desertcart.com.au/products/90013679-tdpro-4-stroke-125cc-semi-auto-single-cylinder-air-cooled
store_origin: AU
region: Australia
---

# 3FWD + 1REV semi-auto gears Electric start convenience 125cc 4-stroke power TDPRO 4-Stroke 125cc Semi-Auto Single-Cylinder Air-Cooled Electric-Start Motor Engine & Wiring Harness Kit for ATV Quad Four Wheelers

**Brand:** tdpro
**Price:** A$4160
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your ride with TDPRO’s 125cc semi-auto engine — where performance meets convenience!

## Quick Answers

- **What is this?** TDPRO 4-Stroke 125cc Semi-Auto Single-Cylinder Air-Cooled Electric-Start Motor Engine & Wiring Harness Kit for ATV Quad Four Wheelers by tdpro
- **How much does it cost?** A$4160 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/90013679-tdpro-4-stroke-125cc-semi-auto-single-cylinder-air-cooled)

## Best For

- tdpro enthusiasts

## Why This Product

- Trusted tdpro brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Fit & Mounting:** Compact dimensions with 3.62'' top and 3.23'' bottom mounts ensure seamless installation on most quad bikes.
- • **Effortless Electric Start:** Skip the hassle with instant ignition—get going faster and stress-free every time.
- • **Semi-Automatic Transmission:** Smooth 3 forward and 1 reverse gear shifts for intuitive control and enhanced riding confidence.
- • **Robust 125cc 4-Stroke Engine:** Efficient air-cooled single-cylinder design delivers reliable power for your ATV adventures.
- • **Complete Wiring Harness Included:** Plug-and-play wiring with gear indicator and ignition signals to streamline your setup and get riding sooner.

## Overview

The TDPRO 125cc 4-stroke semi-automatic engine kit is a compact, air-cooled single-cylinder powerhouse designed for ATV and quad bike enthusiasts. Featuring an electric start, 3 forward and 1 reverse gear transmission, and a comprehensive wiring harness, it offers a balance of reliable performance and user-friendly installation. Ideal for riders seeking a durable upgrade that delivers smooth power and easy control.

## Description

Specifications:Displacement: 125ccType: Horizontal, single-cylinder, 4-stroke, air-cooledCompression ratio: 9.0: 1Front sprocket 420 - 17mm - 14TTransmission: 4-speed 3 forward 1 reverse gearBore x Stroke: 2.06" x 2.19”(52.4mm x 55.5mm) Top Engine Mount : 92mmBottom Engine Mount: 82mm Bolt to Bolt :152mm (6")Rated Power & Rotating Speed: 5.8 kw/7500r/min±375 r/minMax. Torque & Rotating Speed: 8.5 N.m/5000r/min±250 r/minIdle speed 1500 r/min±100r/minIgnition: CDIWiring:1. Five wires (Plug): For gear indicator2. Yellow wire: For storage battery3. Pink (or Yellow) wire: For storage battery4. Black & Red wire: For signal trigger5. Green wire: For grounding6. Blue & White: For trigger coil

Review: I paid almost 500 dollars for this for my son on October last year and still nothing - The wiring harness don't go to it and someone said you need a 24 voltage cdi to start I'm going to keep writing bad reports until I get my money back or some parts to make it run that alot of money going and my son cry every time he see it I can't afford another one
Review: Have it sent right - I used for a quad bike. It worked well. Fast shipping. Here the dislike, they did not plug the carb hole or the muffler hole on intake, was full of styrofoam. Not good on their part for the sales of more and not good for customer.

## Features

- 4 Stroke Engine, Semi Automatic (3 forward 1 reverse gear), electric start, single cylinder
- Front sprocket: 420 - 17mm - 14T, Ignition Method: CDI
- Top Engine Mount: 3.62'', Bottom Engine Mount: 3.23'', Bolt to Bolt: 5.98", Bore x Stroke: 2.06" x 2.19''
- Max Torque & Rotating Speed: 8.5 N.m/5000r/min±250 r/min
- Suitable for ATV Four Wheelers Tricycle Quad bikes

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07FR3YH6Z |
| Best Sellers Rank | #3,473,533 in Automotive ( See Top 100 in Automotive ) #2,388 in Powersports Engine Kits |
| Brand | TDPRO |
| Customer Reviews | 3.5 3.5 out of 5 stars (17) |
| Date First Available | July 20, 2018 |
| Is Discontinued By Manufacturer | No |
| Manufacturer | TDPRO |
| Manufacturer Part Number | USA-TD205-1+USA-TD041 |

## Images

![TDPRO 4-Stroke 125cc Semi-Auto Single-Cylinder Air-Cooled Electric-Start Motor Engine & Wiring Harness Kit for ATV Quad Four Wheelers - Image 1](https://m.media-amazon.com/images/I/61p2tIM2VnL.jpg)
![TDPRO 4-Stroke 125cc Semi-Auto Single-Cylinder Air-Cooled Electric-Start Motor Engine & Wiring Harness Kit for ATV Quad Four Wheelers - Image 2](https://m.media-amazon.com/images/I/51B0hfsbH6L.jpg)
![TDPRO 4-Stroke 125cc Semi-Auto Single-Cylinder Air-Cooled Electric-Start Motor Engine & Wiring Harness Kit for ATV Quad Four Wheelers - Image 3](https://m.media-amazon.com/images/I/51rvBnTuWaL.jpg)
![TDPRO 4-Stroke 125cc Semi-Auto Single-Cylinder Air-Cooled Electric-Start Motor Engine & Wiring Harness Kit for ATV Quad Four Wheelers - Image 4](https://m.media-amazon.com/images/I/61HaKDDdtrL.jpg)
![TDPRO 4-Stroke 125cc Semi-Auto Single-Cylinder Air-Cooled Electric-Start Motor Engine & Wiring Harness Kit for ATV Quad Four Wheelers - Image 5](https://m.media-amazon.com/images/I/61EPUp+IbJL.jpg)

## Customer Reviews

### ⭐ I paid almost 500 dollars for this for my son on October last year and still nothing
*by Z***L on January 8, 2023*

The wiring harness don't go to it and someone said you need a 24 voltage cdi to start I'm going to keep writing bad reports until I get my money back or some parts to make it run that alot of money going and my son cry every time he see it I can't afford another one

### ⭐⭐⭐⭐ Have it sent right
*by K***N on April 25, 2021*

I used for a quad bike. It worked well. Fast shipping. Here the dislike, they did not plug the carb hole or the muffler hole on intake, was full of styrofoam. Not good on their part for the sales of more and not good for customer.

### ⭐ Don’t waste your money
*by C***M on May 5, 2019*

Used this engine to replace the old 119 in my honta atc 3 wheeler The wiring harness does not work at all the kit is a joke pretty much wasted 400 bucks Have tried to contact them to resolve the issue with no response

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**Shop now:** [https://www.desertcart.com.au/products/90013679-tdpro-4-stroke-125cc-semi-auto-single-cylinder-air-cooled](https://www.desertcart.com.au/products/90013679-tdpro-4-stroke-125cc-semi-auto-single-cylinder-air-cooled)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-12*