This cylinder kit includes cylinder, piston, piston pin / wrist pin, piston ring, circlips (2), O-rings (2), base gasket, needle bearing, and dowel pin. The various parts are typically found in different diagrams of several part manuals with the cylinder, O-rings, dowel pin, and gasket in the Cylinder section, and the piston ring kit (piston, piston ring, piston pin, circlips (2), needle bearing) in the Crankshaft – Piston. Commonly used for but not limited to 85cc engines. It is most popularly known for its use in:

Yamaha YZ80 (1993-2001) (if original cylinder is used)

• YZ80E1 (1993)
• YZ80F1 (1994)
• YZ80G1 (1995)
• YZ80H1 (1996)
• YZ80H_SK (1996)
• YZ80 (YZ80J1) (1997)
• YZ80K-SK YZ125SK (1998)
• YZ80SK (1998)
• YZ80 (YZ80K1) (1998)
• YZ80 (YZ80L) (1999)
• YZ80 (YZ80L1) (1999)
• YZ80 (YZ80M1) (2000)
• YZ80 (YZ80N1) (2001)

Yamaha YZ85 (2002-2020)

• YZ85PSK (2002)
• YZ125PSK (2002)
• YZ85P (2002)
• YZ125RSK (2003)
• YZ85RSK (2003)
• YZ85R (2003)
• YZ85S (2004)
• YZ85T (2005)
• YZ85V (2006)
• YZ85W1 (2007)
• YZ85X (2008)
• YZ85Y (2009)
• YZ85Z (2010)
• YZ85A (2011)
• YZ85B (2012)
• YZ85D (2013)
• YZ85E (2014)

as well as many other brands of ATVs, UTVs (side-by-side), dirt bikes, scooters, go karts (buggies), and engines with alternative profile names.

Replaces Yamaha Part Numbers:

• 4ES-11311-30-00 – “CYLINDER 1
• 93210-56459-00 “O-RING | INCL. IN TOP END GASKET KIT”
• 93210-84724-00 ‘.O-RING | INCL. IN TOP END GASKET KIT”
• 4ES-11351-00-00 “GASKET, CYLINDER”
• 5PA-11631-00-A0 5PA-11631-10-A0, 4ES-11631-01-A0 “PISTON (STD)”
• 4ES-11633-00-00 “PIN, PISTON”
• 43K-11611-00-00 “RING, PISTON”

Approximate Dimensions:

• Cylinder Bore and Stroke: 47.50mm (1.87”) x 47.80mm (1.88”)
• Cylinder Displacement: 85cc
• Compression: 8:2:1