Linhai 500cc LH188MR Crankshaft

Linhai 500cc / 550cc Crankshaft (for LH188MR Engine)

Replaces Linhai Part #: 35121 / 1BE-11400-00

Overrunning Clutch side: Thread 16mm

Clutch Carrier side: Thread 18mm / 25mm(24T) / 40mm(21T) / 89mm(43T)

Compatible with Linhai 500cc/550cc models equipped with LH188MR 4-stroke liquid-cooled engine

⚠️ Important Difference Note: Most parts of the Linhai 500cc/550cc engine are the same as the CFMoto CF188. However, this crankshaft has a shorter flywheel rotor end because Linhai 500cc/550cc engines do not have a Recoil Starter. Please verify that your vehicle does not require recoil start functionality before purchasing.

This Crankshaft Assembly is a high-quality OEM replacement part for Linhai, suitable for 500cc/550cc models equipped with the LH188MR 4-stroke liquid-cooled engine. The crankshaft is the core component of the engine, converting the reciprocating motion of the piston into rotational motion for power output. It directly replaces Linhai OEM part numbers 35121 or 1BE-11400-00.

This crankshaft is mostly identical to the CFMoto CF188 crankshaft, but has a shorter flywheel rotor end because Linhai 500cc/550cc engines do not have a recoil starter. Crankshaft end specifications are as follows:

• Direct OEM Replacement: Perfectly matches Linhai OEM part numbers 35121 / 1BE-11400-00, ensuring precise fitment.
• High-Strength Alloy Steel: Forged from high-quality alloy steel with exceptional fatigue strength and wear resistance to withstand combustion pressures.
• Precision Machining: Main journals and crankpins are precision-ground for high surface finish and tight tolerances, ensuring proper bearing fitment.
• Dynamic Balancing: The crankshaft assembly undergoes precise dynamic balancing to minimize vibration at high speeds, extending engine life.
• Linhai-Specific Design: Shorter flywheel rotor end, optimized for Linhai 500cc/550cc engines without recoil starter.

✅ Importance of Crankshaft Replacement: The crankshaft is one of the most critical and highly stressed components in an engine. After prolonged high-load operation, the crankshaft may develop wear on main or connecting rod journals, fatigue cracks, or bending. These issues lead to engine knocking, increased vibration, low oil pressure, and in severe cases, crankshaft failure resulting in complete engine destruction. During an engine overhaul, if the crankshaft is found to be out of specification or damaged, it must be replaced promptly to ensure engine performance and reliability.

⚠️ Important Note Before Ordering: This crankshaft has a shorter flywheel rotor end and is specifically designed for Linhai 500cc/550cc models without a recoil starter. It cannot be used on CFMoto CF188 engine models that require a recoil starter. Please verify your original crankshaft specifications. Crankshaft replacement is a major engine overhaul procedure requiring specialized knowledge and tools. Installation must be performed by an experienced professional technician strictly following the service manual, with simultaneous replacement of bearings, seals, and related components.