CG 125cc Piston (Pin 15mm)

Brand: Mortch Motor
Product Code: MICG125-1024-15

Product Viewed: 159

Availability: Pre-Order

Weight: 0.20kg

Packing Size: 7.00 x 7.00 x 7.00cm

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US$2.62

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CG125 Piston - 15mm Pin

🏍️ Piston · Piston Body · Engine Rebuild Part · CG125 Specific

For CG125 Engines · Piston Diameter 56.5mm · 15mm Piston Pin · Affordable Replacement Choice

📋 Product Overview

This is the CG125 Piston (15mm Pin) — an excellent inexpensive replacement piston. This product includes the piston body, piston pin, and circlips (piston rings are not included), making it an ideal choice for engine overhaul or performance restoration.

The piston is a core moving component of the engine combustion chamber, directly withstanding high temperature and pressure from combustion and transmitting power to the crankshaft via the connecting rod. This piston is manufactured from high-quality aluminum alloy with a piston diameter of 56.5mm and a piston pin diameter of 15mm, featuring precision machining for excellent fit accuracy and wear resistance. This is the perfect replacement when the original piston suffers from wear, scoring, or heavy carbon buildup in the ring grooves.

✨ Core Functions: Withstand combustion pressure and transmit power · Form sealed combustion chamber · Restore engine power · Work with piston rings for sealing

📐 Specifications

Product Name

Piston (CG125)

Compatible Engine

CG125 Engine

Piston Diameter

56.5mm

Piston Pin Diameter

15mm

Displacement

125cc

Piston Material

High-Strength Aluminum Alloy

Compression Height

Approx. 21mm

Kit Includes

Piston + Pin + Circlips

Piston Rings

Sold Separately

⚠️ Important: Piston Pin Size Confirmation

This is the 15mm piston pin version. CG125 engines come with two common piston pin sizes: 13mm and 15mm. Please verify your original piston pin diameter before purchasing to ensure correct selection. If unsure, measure the original piston pin or consult your engine service manual.

🔧 Compatibility

This piston is compatible with the following engines and vehicles:

Engine Types: CG125 4-stroke engines
Piston Pin Size: 15mm (verify your original is 15mm)
Vehicle Types: Honda CG125, Chinese-made CG series motorcycles, dirt bikes, street bikes
Applications: Engine overhaul, piston wear replacement, power restoration

📌 Compatibility Note: This piston is specifically designed for CG125 engines with 56.5mm piston diameter and 15mm piston pin. Before purchasing, please verify your original piston pin size is 15mm. CG125 engines have two piston pin sizes (13mm and 15mm) — selecting the wrong size will prevent installation.

🏍️ Importance of the Piston

🔥 Withstand Combustion Pressure

Directly withstands high temperature and pressure from combustion, transmitting power to the crankshaft via the connecting rod.

🔒 Form Combustion Chamber

Forms a sealed combustion space with the cylinder and cylinder head for efficient combustion.

🔄 Reciprocating Motion Guide

Moves rapidly up and down within the cylinder, converting thermal energy into mechanical energy.

🔧 Piston Ring Carrier

Provides mounting grooves for piston rings, working with them to achieve cylinder sealing and oil control.

⚠️ Symptoms of Piston Failure: Significant power loss, poor acceleration, engine noise (piston slap), hard starting, oil burning, low compression pressure, heavy carbon buildup on spark plug. If these issues occur, please inspect and replace the piston promptly.

✨ Product Features

High-Quality Aluminum Piston: Made from high-strength aluminum alloy with lightweight construction, high strength, low thermal expansion, and precise fit with cylinder walls.
Precision-Machined Ring Grooves: Ring grooves are precision-machined to ensure smooth piston ring movement and excellent sealing performance.
Precision Piston Pin: 15mm diameter piston pin is heat-treated and precision-ground for high strength and wear resistance.
Included Circlips: Circlips are provided to securely retain the piston pin, preventing it from coming loose.
OEM Specification Standards: Manufactured to CG125 original specifications for perfect fitment.
Excellent Value: High quality at an affordable price — the ideal choice for engine overhaul.

🔧 Installation Guide

1. Ensure the engine is completely cooled and clean carbon deposits from the ring grooves before installation.
2. When installing the piston pin, ensure the circlips are fully seated in the circlip grooves and check they are secure.
3. When installing the piston, ensure the arrow or marking on the piston faces the exhaust side (or follow the original orientation).
4. Apply a small amount of engine oil to the piston skirt before installation to prevent dry start-up.
5. Use a piston ring compressor tool to avoid damaging the cylinder wall during installation if installing with piston rings.
6. If replacing piston rings, purchase a compatible piston ring set separately. Pay attention to ring orientation and gap staggering during installation.
7. After installation, manually rotate the crankshaft to confirm smooth piston movement without binding.
8. It is recommended to inspect cylinder wear and replace the cylinder if necessary for optimal results.

⚠️ Important Notice: This product is the CG125 Piston with 56.5mm piston diameter and 15mm piston pin. Designed for CG125 series 125cc engines.
Spec Confirmation: Before purchasing, verify your original piston pin diameter is 15mm (not 13mm). CG125 engines have two piston pin sizes — please measure and confirm before ordering.
Installation Caution: Piston rings are not included with this product; please purchase a compatible piston ring set separately if needed. Piston installation involves critical engine components. Professional installation is strongly recommended. Product images are for reference only; please refer to the actual product.

🔧 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.