This official Yamaha JT1/JT1L Crankcase & Cylinder Parts Manual provides comprehensive component listings and part numbers for these vintage motorcycle models. The manual contains detailed breakdowns of crankcase and cylinder assemblies, including precise part numbers, descriptions, quantities, and assembly references essential for restoration and maintenance work.
The document features complete parts catalogs with official Yamaha part numbers such as crankcase components (257-15111-01-00, 257-15121-01-00), dowel pins, pan head screws, stud bolts, cylinder gaskets, and gasket kits. Each component is clearly identified with reference numbers, official part numbers, descriptions, and required quantities for proper assembly and ordering.
Perfect for motorcycle enthusiasts, mechanics, and collectors working on Yamaha JT1 and JT1L motorcycles, this parts manual serves as an indispensable reference for identifying correct components, sourcing replacement parts, and understanding the intricate assembly relationships between crankcase and cylinder components. The manual maintains the original Yamaha formatting and part numbering system for authenticity and accuracy.








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