This comprehensive Yamaha MJ50J parts manual provides complete parts catalog information for the MJ50J motorcycle/scooter model. The manual contains detailed parts diagrams, part numbers, and specifications essential for maintenance, repair, and parts ordering. Each component is clearly illustrated with corresponding part numbers, quantities, and assembly references to ensure accurate identification and ordering of replacement parts.
The manual covers all major systems including cylinder head assembly, crankshaft components, connecting rod assemblies, and related hardware. Part numbers are provided in the standard Yamaha format, making it easy to cross-reference with dealer parts systems and aftermarket suppliers. The document includes detailed breakdowns of cylinder components, gaskets, bolts, washers, and specialized hardware with their respective part numbers such as 4J2-11111-00-00 for cylinder head, NGK-BP4HS spark plug specifications, and crankshaft assembly details.
This vintage parts catalog is an invaluable resource for MJ50J owners, mechanics, and restoration enthusiasts who need accurate parts information for their vintage Yamaha motorcycle or scooter. The clear layout and comprehensive coverage make parts identification straightforward, whether you’re performing routine maintenance or complete restoration work on your classic Yamaha MJ50J.








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