Yamaha YZ85 2002 - 2018 Athena Piston, Crank & Cylinder Kit Big Bore 53mm/112Cc

YAMAHA YZ85 ATHENA PISTON, CRANK & CYLINDER KIT 2002 - 2017 BIG BORE 53mm/112cc

Big Bore Cylinder Kit (112cc) designed for Yamaha`s smallest MX model. This is a complete cylinder and stroker kit and requires the bottom case to be opened for new crankshaft installation. Completely redesigned, the cylinder has been developed to increase horsepower while maintaining long term reliability. Features include - 25% increase in piston surface, expanded intake port, unique 2 stage booster exhaust port (eliminating the bridged port) and a larger water jacket for superior cooling.

Features:

• Aluminum cylinder with nickel-carbide coating
• Complete piston kit, rings, circlips
• Complete top end gasket kit
• Easy to follow step-by-step installation instructions
• We recommend a fully qualified motorcycle mechanic this install kit

Technical Information:

                                          Athena                                           OEM
Cylinder Bore                        53 mm                                       47.5 mm
Stroke                               51.0 mm                                       47.8 mm
Displacement                        112 cc                                          84.7 cc
Compression Ratio                   14:1                                             8.2:1
Power at the Rear Wheel       20.5 kw / 27.5 hp / 10900 rpm         15.7 kw / 21.0 hp / 11300 rpm

Fitment Details

• Yamaha YZ85 2002
• Yamaha YZ85 2003
• Yamaha YZ85 2004
• Yamaha YZ85 2005
• Yamaha YZ85 2006
• Yamaha YZ85 2007
• Yamaha YZ85 2008
• Yamaha YZ85 2009
• Yamaha YZ85 2010
• Yamaha YZ85 2011
• Yamaha YZ85 2012
• Yamaha YZ85 2013
• Yamaha YZ85 2014
• Yamaha YZ85 2015
• Yamaha YZ85 2016
• Yamaha YZ85 2017
• Yamaha YZ85 2018