Crankcase Right

The Crankcase Right, also called the right crankcase cover or clutch-side engine cover, is the protective outer housing located on the right side of the motorcycle engine. It encloses and protects several essential internal components while ensuring proper lubrication and engine operation.

Main Functions

Protects internal engine components, especially the clutch system, oil pump, and primary drive gears.
Seals the engine’s lubrication system, keeping the oil inside and maintaining correct pressure.
Serves as a mounting point for components like the clutch actuator or oil filter (depending on model).
Helps dissipate heat generated by the clutch and engine.

Components Typically Housed Inside / Behind the Right Crankcase

Clutch assembly (clutch basket, plates, pressure plate)
Primary drive gear
Oil pump and internal oil passages
Starter clutch / flywheel gear (on some models)
Kickstart gear (if the bike has a kickstarter)

Construction

Usually made from cast aluminum alloy for durability and heat dissipation.
Features machined gasket surfaces to ensure perfect sealing.
Often coated with protective paint or powder coating to resist corrosion.

Exterior Features

Oil inspection window (on many models) to check oil level
Bolt holes around the perimeter for tight and even sealing
Brand or engine markings
Smooth or ribbed surface depending on engine design

Location on the Motorcycle

Located on the right-hand side of the engine, opposite the stator or magneto cover.
Usually positioned below the carburetor/intake area and beside the starter motor.

Role in Performance & Maintenance

A good crankcase right cover ensures:

No oil leakage
Stable clutch operation
Proper alignment of internal components
Protection from dust, water, and debris

A damaged or cracked cover can cause:

Oil leaks
Overheating
Dust or water entering the engine
Clutch malfunction

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