CG Oil Seal of Valve

Brand: Mortch Motor
Product Code: MICG125-1011

Product Viewed: 36

Availability: In Stock

Weight: 0.00kg

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CG Valve Oil Seal

🔧 Valve Oil Seal · Valve Stem Seal · CG125/CG150 Engine · Oil Burning Repair Part

For CG125 · CG150 4-Stroke Engines · Honda Style CG/CB Series

📋 Product Overview

This is the CG Valve Oil Seal, specifically designed for CG125, CG150, and other 4-stroke engines. The valve oil seal is a critical sealing component in the engine valve train, installed at the top of the valve guide and fitted around the valve stem to control the amount of oil entering the combustion chamber.

The primary function of the valve oil seal is to prevent engine oil from seeping down the valve stem into the combustion chamber, while allowing a small amount of oil to lubricate the friction surfaces between the valve stem and guide. When the valve oil seal becomes aged, hardened, or damaged, oil can enter the combustion chamber through the valve stem clearance, resulting in oil burning.

✨ Core Functions: Control oil entry into combustion chamber · Prevent oil burning · Reduce carbon buildup · Protect valve guide · Maintain normal engine operation

⚠️ Failure Symptoms & Diagnosis

💨 Common Symptoms

• White or blue smoke from exhaust pipe (most common symptom)
• Noticeably increased oil consumption
• Heavy smoke on cold start, reduces as engine warms up
• Excessive carbon buildup on spark plug, electrode appears wet
• Rough idle, poor acceleration
• Burnt oil smell from exhaust

🔍 Failure Causes

• Rubber aging and hardening from prolonged high-temperature operation
• Low-quality oil or extended oil change intervals accelerate seal degradation
• Improper installation causing lip damage
• Valve stem wear leading to poor sealing
• High mileage with natural wear and aging

⚠️ Key Indicator: If you notice white or bluish-white smoke coming from the exhaust pipe along with abnormally high oil consumption, there is a high probability that the valve oil seal is damaged. Replacing the valve oil seal promptly will prevent excessive oil consumption, reduce carbon buildup, restore engine performance, and extend catalytic converter life.

📐 Specifications

Displacement

125cc / 150cc

Engine Models

CG125 · CG150 · CB125 · CB150

Material

High-Temp Fluorocarbon Rubber (FKM)

Mounting Location

Top of Valve Guide

Quantity per Cylinder

2 (Intake + Exhaust)

Engine Type

CG/CB Series 4-Stroke

🔧 Compatible Engines & Vehicles

Compatible Engine Models: CG125 · CG150 · CB125 · CB150 and Honda-style 4-stroke engines

CG125

CG150

CB125

CB150

Compatible Vehicles:

CG125 / CG150 Motorcycles
CB125 / CB150 Motorcycles
Honda CG/CB Series Models
Other motorcycles and ATVs equipped with Honda-style CG/CB series engines

💡 Replacement Note: Valve oil seals are wear-and-tear components that typically may show signs of aging after 30,000-50,000 km (18,000-31,000 miles) of operation. It is recommended to replace both intake and exhaust valve oil seals at the same time to ensure consistent sealing performance on both sides.

✨ Product Features

High-Temperature Fluorocarbon Rubber (FKM): Manufactured from premium FKM material with temperature resistance up to 200°C (392°F), excellent aging resistance, and long service life.
Precision-Molded Lip: The seal lip is precision-molded for a tight fit around the valve stem, effectively preventing oil leakage.
Integrated Garter Spring: Features a high-quality internal spring that maintains consistent sealing pressure and compensates for wear.
OEM Specification: Manufactured to exact CG/CB series engine factory specifications for a perfect replacement of worn original seals.
Eliminates Oil Burning: Effectively resolves white/blue smoke issues caused by damaged valve oil seals and reduces oil consumption.
Restores Engine Performance: Reduces carbon buildup, improves combustion efficiency, and restores power and fuel economy.

🔧 Installation Guide

1. Remove the cylinder head and secure it on a suitable fixture.
2. Use a valve spring compressor tool to remove valve springs and retainers, then extract the valves.
3. Carefully remove the old valve oil seal using a specialized tool or needle-nose pliers, avoiding scratches on the valve guide inner surface.
4. Thoroughly clean the valve guide top mounting surface, ensuring no old seal residue or contaminants remain.
5. Apply a small amount of engine oil to the new seal lip and mounting area for lubrication.
6. Use a dedicated installation sleeve to press the new seal vertically into place, ensuring it seats firmly against the valve guide boss.
7. Reinstall valves, valve springs, and retainers, ensuring retainers are fully seated in the valve stem grooves.
8. Reinstall the cylinder head and related components, add fresh engine oil, start the engine and check for leaks and smoke.
Important Note: Always use specialized tools when installing valve oil seals to prevent lip rolling or damage. It is recommended to replace both intake and exhaust valve oil seals simultaneously. Professional installation is strongly recommended.

⚠️ Important Notice: This is the CG Valve Oil Seal, designed for CG125, CG150, and Honda-style CG/CB series 4-stroke engines.
Failure Diagnosis: If you notice white or bluish-white smoke from the exhaust pipe along with significantly increased oil consumption, the valve oil seal is likely damaged. Please inspect and replace promptly.
Installation Caution: Valve oil seal installation requires specialized tools. Improper installation may cause seal damage or poor sealing. Professional installation is strongly recommended. Consider replacing the cylinder head gasket and other seals when replacing valve oil seals.
Recommended Parts: When replacing valve oil seals, inspect valve stem and valve guide wear, and replace if necessary. 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.