---
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: "€ 2481.19"
currency: EUR
in_stock: true
category: "Tdpro"
url: https://www.desertcart.pt/products/90013679-tdpro-4-stroke-125cc-semi-auto-single-cylinder-air-cooled
store_origin: PT
region: Portugal
---

# 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:** € 2481.19
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your ride with precision and ease — the ultimate ATV engine upgrade!

## 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?** € 2481.19 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/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.
- • **Effortless Electric Start:** Skip the hassle—ignite your ride instantly with a smooth electric start system.
- • **Semi-Automatic Transmission:** 3 forward gears plus reverse for intuitive control without clutch complexity.
- • **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-ready connections for quick setup.

## Overview

The TDPRO 125cc 4-stroke semi-automatic engine kit features a single-cylinder, air-cooled design with electric start and a 4-speed transmission (3 forward, 1 reverse). It includes a complete wiring harness and precise mounting dimensions, making it ideal for ATV, quad, and tricycle applications seeking reliable power and user-friendly operation.

## 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

## 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 | #3,962,769 in Automotive ( See Top 100 in Automotive ) #2,595 in Powersports Engine Kits |
| Brand | TDPRO |
| Customer Reviews | 3.6 3.6 out of 5 stars (17) |
| Date First Available | July 20, 2018 |
| 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)

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

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-11-02*