This comprehensive engine rebuild kit is designed for Yamaha YZ85 models from 2002 to 2014 and includes a new cylinder, standard 47.5 mm piston, crankshaft assembly and a complete gasket set (KOYO Bearings). Components are produced from high-grade materials to precise tolerances for reliable performance and are supplied as direct replacements for the original parts.

Features

• KOYO Main Bearings
• Constructed from high-tech materials for dependable performance and durability
• Manufactured to precise standards; meets or exceeds OEM quality
• Direct replacement for original equipment
• Straightforward to install; professional assistance recommended if unsure
• Check images before ordering to confirm contents and compatibility
• Cost-effective, all-in-one solution for a complete engine overhaul

Specifications

• Compatible model: Yamaha YZ85 (2002–2014)
• Piston diameter: 47.5 mm (standard size)
• Cylinder included
• Crankshaft assembly included
• Complete gasket set included

Cross-Reference OEM Part Numbers

• Cylinder: 5PA-11311-00-00, 5PA-11311-30-00, 5PA-11311-01-00, 5PA-11311-10-00, 5PA-11311-20-00
• Gasket, cylinder (included in top-end gasket kit): 4ES-11351-00-00
• O-rings (included in top-end gasket kit): 93210-56459-00, 93210-84724-00
• Crankshaft: 5PA-11400-00-00
• KOYO Bearings: 93306-20438-00, 93306-20468-00, 93306-30421-00
• Oil seals: 93102-28009-00, 93102-20447-00, SD 12-22-5 HS (93102-12106-00), 93102-17263-00, 93102-26042-00
• Piston (standard size): 5PA-11631-00-D0, 5PA-11631-10-D0, 5PA-11631-00-C0, 5PA-11631-10-C0, 5PA-11631-00-B0, 5PA-11631-10-B0, 5PA-11631-00-A0, 5PA-11631-10-A0
• Piston pin: 4ES-11633-00-00
• Piston rings: 5PA-11611-00-00, 5PA-11611-01-00
• Circlip: 93450-16115-00
• Bearing: 93310-21417-00
• Gaskets: Crankcase Cover 2 (4ES-15461-00-00), Gasket 2 (5PA-15463-00-00), Crankcase Cover 1 (5PA-15451-00-00), Housing Cover 2 (4BA-12428-00-00)

Vehicle Fitments

• Yamaha YZ85 (2002–2014)