WH 125cc 150cc Starter Clutch Assy

Brand: Mortch Motor
Product Code: MIWH125-3015

Product Viewed: 162

Availability: Pre-Order

Weight: 0.90kg

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WH 125cc / 150cc Starter Clutch Assembly

🔧 Starter Clutch · One-Way Clutch · Electric Starter Component · Engine Rebuild Part

For QJ153QMI Engine · Compatible with Keeway ARN 125, F-act 125, Matrix 125, RY8 125, RX9 LEONE and GY6 Platform Models

📋 Product Overview

This is the WH High-Quality Starter Clutch Assembly (also known as one-way clutch or overrunning clutch), a critical component of the electric starting system. It is specifically designed for QJ153QMI engines and fits Keeway and other GY6-based 125cc and 150cc scooter models equipped with 153QMI or 152QMI engines.

The starter clutch is located on the right side interior of the engine, engaging with the starter motor gear. When the starter motor operates, the clutch locks in one direction to rotate the crankshaft and start the engine. After the engine starts, the clutch automatically disengages to prevent the crankshaft from back-driving the starter motor. Manufactured with high-wear-resistant materials and precision machining, this product ensures reliable starting and smooth disengagement, making it the ideal replacement for issues like weak starting, free spinning, or abnormal noises.

✨ Core Functions: Transmit starter motor torque · One-way lock to rotate crankshaft · Auto disengage after start · Protect starter motor · Ensure reliable ignition

📐 Specifications

Displacement

125cc / 150cc

Engine Model

QJ153QMI / 152QMI (GY6)

Mounting Location

Right Side Interior

Tooth Count

Standard GY6 Spec

Type

Roller-Type One-Way Clutch

Kit Includes

Starter Clutch Assembly

🔧 Compatible Engines & Vehicles

Compatible Engine Models: QJ153QMI / 152QMI (GY6 Series)

QJ153QMI

152QMI (GY6)

Compatible Vehicles:

Keeway ARN 125
Keeway F-act 125
Keeway Matrix 125
Keeway RY8 125
Keeway RX9 LEONE
Other 125cc and 150cc scooter models equipped with QJ153QMI / 152QMI (GY6) engines

Engine Reference Information:

153QMI: Newer engine model, an improved version of the standard GY6 152QMI engine.
GY6 Platform: Widely used in 125cc/150cc scooters, one of the most common engine platforms worldwide.

Note: This starter clutch is designed for GY6 series engines. Please verify your engine model and starter mechanism specifications before purchase.

⚙️ How It Works & Failure Diagnosis

🔩 How It Works

When starting, the starter motor gear rotates the clutch outer race. Internal rollers wedge and lock, driving the crankshaft to start the engine. After the engine starts, the crankshaft rotates faster than the clutch outer race, causing the rollers to retract and disengage, preventing the crankshaft from back-driving the starter motor.

⚠️ Common Failure Symptoms

• Starter motor spins but engine does not crank
• Unusual noises or slipping sounds during starting
• Hard starting, requires multiple attempts
• Abnormal noise continues after engine starts

🔍 Quick Test Method: Remove the starter motor and manually spin the starter clutch gear. If the gear spins freely in both directions (under normal conditions it should only spin in one direction and lock in the opposite), the clutch is worn out and needs replacement. Frequent starting attempts and hard starting conditions accelerate clutch wear.

⚠️ Failure Consequences: A failed starter clutch will prevent electric starting from working properly. In severe cases, it may damage the starter motor or flywheel ring gear. Timely replacement is recommended.

✨ Product Features

High-Quality Materials: Manufactured from high-strength alloy steel. Rollers and wedge surfaces undergo precision heat treatment for excellent wear resistance.
Precision Machining: Critical components are precision ground to ensure reliable one-way locking and smooth disengagement without binding.
OEM Specification: Built to exact GY6 engine factory specifications for a perfect replacement of worn components.
Durable Design: Optimized roller and spring structure for superior fatigue resistance and extended service life.
Ready to Install: Supplied as a complete assembly, no additional assembly required before installation.
Reliable Starting: Restores electric starting system functionality, eliminating free spinning, noise, and starting issues.

🔧 Installation Guide

1. Disconnect the negative battery terminal before starting for safety.
2. Remove the right side CVT cover and transmission components to access the starter clutch area.
3. Remove the starter motor. Secure the magneto rotor with a holding tool, then remove the starter clutch retaining nut (note: left-hand thread on most GY6 engines).
4. Remove the old starter clutch, clean the mounting surface and crankshaft journal thoroughly.
5. Install the new starter clutch and tighten the retaining nut to factory torque specifications.
6. Before reinstalling the starter motor, check the engagement between the motor gear and clutch gear.
7. Reinstall transmission components and CVT cover in reverse order, reconnect the battery, and test starting function.
Important Note: The starter clutch retaining nut typically has left-hand threads — turn clockwise to loosen, counter-clockwise to tighten.

⚠️ Important Notice: This is the WH 125cc/150cc Starter Clutch Assembly, designed for QJ153QMI and GY6 series engines. Compatible with Keeway ARN 125, F-act 125, Matrix 125, RY8 125, RX9 LEONE, and similar platform scooters.
Spec Confirmation: Before purchasing, verify your engine model (153QMI/152QMI) and starter mechanism specifications to ensure compatibility.
Failure Diagnosis: If the starter clutch gear spins freely in both directions after removing the starter motor, the clutch is worn and requires replacement.
Installation Caution: Starter clutch installation involves internal engine components. Professional installation is strongly recommended. Pay attention to the retaining nut thread direction (left-hand thread) and tighten to specified torque. Product images are for reference only; actual product may vary.

🔧 Compatibility Notice

Please verify that this part fits your specific vehicle model and year. Many vehicles share similar names but use different components depending on year or market region.
We strongly recommend cross-checking with your vehicle's owner's manual or contacting us for confirmation before placing your order.

📄 Product Disclaimer

Product images, measurements, and descriptions are for reference only. Slight variations in color or appearance may occur due to manufacturing batches or photography lighting—functional specifications remain identical to the ordered part.
Professional installation is mandatory. Mortch Motor assumes no liability for damages, injuries, or losses resulting from improper installation, misuse, unauthorized modification, or abnormal operation.

💰 Import Duties & Taxes

All listed prices EXCLUDE shipping costs, import duties, taxes, and customs clearance fees. These charges (if applicable) are determined and collected by your local customs authority and are solely the buyer's responsibility.
In case of return due to unpaid duties/taxes or refusal to clear customs, the buyer shall bear the original shipping cost, return shipping fees, and any associated administrative charges deducted from the refund.

📌 Order Confirmation: By completing your purchase, you acknowledge that you have read, understood, and agreed to all terms above. For any questions, please contact our support team prior to ordering.