Short Description: Restore the rock-solid stability of your engine's core with this precision-engineered crankshaft rear bearing. Essential for eliminating crankshaft play and ensuring smooth, vibration-free power delivery in your Dnepr MT-11.

Technical Specifications:

• Compatibility: Dnepr MT-11 (Model KM3-8.155.6 and compatible 649cc series)
• Manufacturer Code / SKU: 42209 (Ref: 42209K1M)
• Part Type: Engine / Crank Gear

Purpose and Role in the Motorcycle (based on the original manual):
The crankshaft is the central component of the Dnepr MT-11 engine, constructed from high-duty cast iron to handle the immense stresses of a heavy-duty sidecar vehicle. The 42209 roller bearing serves as the primary support for the rear end of the crankshaft within the engine crankcase. Its role is to allow the crankshaft to rotate with minimal friction while maintaining a precise axial alignment, especially where the flywheel is mounted. Because this bearing manages the radial loads of the crankshaft's 180° throw, any wear or failure can lead to significant engine instability. Signs that it is time to replace this bearing include unusual metallic knocking sounds coming from the rear of the crankcase, increased engine vibration, or visible play in the crankshaft during a complete engine overhaul.

Benefits of Buying:

• Exact Technical Fit: Manufactured to the precise dimensions of the 42209K1M radial roller bearing specified in the original Dnepr MT-11 technical manual.
• Enhanced Engine Longevity: Reducing friction and play in the rear journal protects the high-duty cast iron crankshaft from premature wear.
• Restored Factory Performance: Ensures the flywheel and clutch assembly rotate on a true axis, resulting in smoother gear engagement and more consistent engine idling.