CG Crankcase LH

Brand: Mortch Motor
Product Code: MICG125-1072

Product Viewed: 192

Availability: Pre-Order

Weight: 1.00kg

0 reviews / Write a review

US$27.50

Shipping To：

More Quotes

CG Crankcase LH · Left Crankcase

🔧 Left Crankcase · Engine Left Case · CG125/CG150 Engine · Engine Housing Component

For CG125 · CG150 4-Stroke Engines · Left Crankcase Housing

📋 Product Overview

This is the CG Crankcase LH (Left Crankcase), a high-quality, cost-effective replacement for the left half of the crankcase in CG125 and CG150 4-stroke engines. Specifically designed for CG series engines, this crankcase is suitable for motorcycles, ATVs, and various other vehicles, making it the ideal choice for engine rebuilds or crankcase repairs.

The left crankcase is one of the main structural components of the engine. When assembled with the right crankcase, it forms the sealed crankcase and transmission chamber, housing the crankshaft, transmission, magneto, and other core components. Manufactured from high-quality aluminum alloy with precision machining and aging treatment, this crankcase offers excellent strength, rigidity, and dimensional accuracy, ensuring engine assembly precision and operational reliability.

✨ Core Functions: Support crankshaft and transmission · Form sealed engine cavity · Provide bearing mounting seats · Support magneto and starter mechanism

🔧 Technical Information

📌 Left Crankcase Features

The CG series left crankcase houses critical structures including crankshaft bearing seats, transmission bearing seats, magneto stator mounting points, and starter shaft mounting holes, serving as the foundation for all components on the left side of the engine.

📌 Assembly Precision

The left and right crankcase halves are precisely aligned using dowel pins. The assembled crankcase ensures coaxiality of the crankshaft and transmission shafts, directly affecting engine smoothness and service life.

📐 Specifications

Displacement

125cc / 150cc

Engine Models

CG125 · CG150

Material

High-Quality Aluminum Alloy

Manufacturing Process

Precision Casting · Aging Treatment

Surface Finish

Precision Machined · Shot Blasted

Mounting Location

Left Side of Engine

Associated Parts

Right Crankcase · Dowel Pins · Case Bolts

Includes

Left Crankcase Housing

⚠️ Crankcase Failure Symptoms

💨 Common Symptoms

• Engine oil leaks (at mating surfaces or cracks)
• Unusual engine noise (worn bearing seats)
• Loose crankshaft or transmission bearings
• Excessive engine vibration
• Cracked or damaged crankcase
• Damaged mounting threads

🔍 Possible Causes

• Impact or drop causing case fracture
• Worn bearings causing enlarged bearing bores
• Over-tightened bolts causing thread damage
• Deformation from prolonged use
• Casting defects or stress concentration

⚠️ Important Note: Crankcase damage can prevent normal engine operation and, in severe cases, cause crankshaft seizure or transmission failure. If you notice cracks, bearing seat wear, or other issues, replace the crankcase promptly.

🏍️ Compatible Vehicles

This left crankcase fits vehicles equipped with CG125 and CG150 4-stroke engines, including but not limited to:

CG125 Motorcycles

CG150 Motorcycles

Honda CG Series

ATVs / Quad Bikes

Trikes / Three-Wheelers

💡 Compatibility Note: This left crankcase is suitable for CG125 and CG150 engines. During installation, it is recommended to also replace dowel pins, oil seals, and case gaskets to ensure proper sealing.

✨ Product Features

High-Quality Aluminum Alloy: Cast from premium aluminum alloy for lightweight construction, high strength, and excellent heat dissipation.
Precision Casting: Precision casting process ensures high dimensional accuracy and clear internal structures.
Aging Treatment: Aging treatment eliminates internal stress to prevent deformation during use.
Precision Machining: Critical areas such as bearing seats, mating surfaces, and mounting holes are precision-machined to ensure assembly accuracy.
OEM Specification: Manufactured to exact CG series engine factory specifications for perfect replacement of damaged original cases.
Cost-Effective: Excellent value, ideal replacement for original crankcase.

🔧 Installation Guide

1. Remove the engine from the frame.
2. Remove the right crankcase and extract all internal components (crankshaft, transmission, shift forks, etc.).
3. Clean the left crankcase and inspect bearing seats and threaded holes.
4. Install new bearings, oil seals, and dowel pins.
5. Install the crankshaft, transmission, and other components into the left crankcase.
6. Assemble the right crankcase, ensuring dowel pins align and the mating surfaces are flush.
7. Install case bolts and tighten in a diagonal pattern in stages to specified torque.
8. Verify smooth crankshaft rotation and proper transmission shifting.
9. Reinstall other components, add fresh engine oil, and start the engine to test operation.
Important Note: Crankcase installation involves critical engine components and requires specialized tools and expertise. Professional installation is strongly recommended. Always use new oil seals and gaskets.

⚠️ Important Notice: This is the CG Crankcase LH (Left Crankcase), designed for CG125 and CG150 4-stroke engines.
Spec Confirmation: Before purchasing, verify your engine model to ensure compatibility. The left and right crankcases must be used together — inspect the condition of the right crankcase as well.
Installation Note: Crankcase installation involves critical engine components and requires specialized tools and expertise. Professional installation is strongly recommended. Always use new oil seals, gaskets, and tighten case bolts to specified torque.
Recommended Parts: When replacing the crankcase, it is recommended to also replace bearings, oil seals, dowel pins, and related components to ensure rebuild quality. 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.