The Honda Genuine Transmission Case Oil Seal (Part No. 91203-KWP-D01) is a factory-original powertrain sealing component engineered specifically for Honda’s 100cc and 110cc automatic scooter platforms. Positioned deep inside the rear transmission subsystem, this oil seal sits tightly inside the gear assembly housing over the final drive shaft (wheel axle shaft).
Its critical job is to contain specialized, high-viscosity rear gearbox transmission fluid inside the reduction gear chamber. At the same time, it keeps external road dust, water mud during monsoons, and abrasive brake shoe debris from slipping past the boundary lines into the gears. Utilizing this authentic factory-grade replacement part ensures a leak-free seal. It preserves the vital lubrication required by fast-spinning gear teeth and completely prevents the rear wheel area from getting soaked in slick oil.
(Note on physical dimensions: While technical catalogs occasionally label the outer housing diameter as a cross-reference variant, the factory-standard sizing laser-etched onto the authentic casing is precisely , matching the official OEM specification).
Key Features:
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100% Honda Genuine Final Drive Spares: Factory-original reduction gearbox oil seal built to match strict OEM technical standards.
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Premium High-Density Nitrile Elastomer: Formulated to resist high-pressure degradation and structural breakdown from prolonged contact with heavy-viscosity gear oil.
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Internal Structural Steel Garter Spring: Equipped with a precision-wrapped internal metal retention ring that ensures constant radial sealing pressure over the spinning output axle shaft during high loads.
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Advanced Dust-Scraper Secondary Lip: Features a dual-lip architecture, built with a primary oil sealing edge and an external secondary lip to block fine brake dust and road grime from reaching the inner chamber.
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Perfect Dimensional Press-Fit: Machined to exact specifications to guarantee a seamless, distortion-free seat inside the transmission case wall.
Technical Specifications:
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Brand: Honda Genuine Parts
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Part Number: 91203-KWP-D01 (Also matches sub-codes like 91203KWPD01)
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Component: Final Drive Shaft / Gearbox Output Case Oil Seal
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Dimensions:
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Material: Premium Weather-Resistant Synthetic Rubber Compound with Steel Spring
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Country of Origin: India
Scooter Compatibility
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Honda Activa 110cc Platforms: Activa 3G, Activa 4G, Activa 5G, and Activa 6G (including H-Smart editions).
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Honda Activa 125cc Generations: Fits standard carbureted and fuel-injected (FI/BS6) variations.
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Honda Dio 110cc / 125cc: Suitable across all generation lines sharing Honda’s standard rear transmission case geometry.
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Honda Aviator & Grazia: Fits models utilizing this standard output shaft seating configuration.











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