Compatible with OEM Part Numbers Yamaha 3L5-11311-01-00, 517-11181-01-00, 3L5-11111-02-00, 3PT-11351-00-00, 90116-06269-00, 95380-06600-00, BP4-HS000-00-00, 18U-11631-00-A0, 260-11601-03-00, 2E9-11633-00-00, 93450-11021-00, 93310-210M0-00 Compatible with the 1979-1987 Yamaha QT50, 1981-2017 Yamaha PW50 Motorcycles Includes Cylinder, Cylinder Head, Piston Kit, Gasket Kit, Hardware and NGK Spark-Plug The Standard Bore Cylinder has a 40.00 mm Bore and 39.20 mm Stroke The Cylinder Displacement is 49cc and has a 6.01 Compression Ratio; Cylinder Material Steel; Cylinder Sleeve Coating None Included Items in This Bundle:

(QTY 1) NICHE 519-CCY2223H Cylinder Head

Substitute For OEM Part Numbers(s): L5-11111-02-00, 4J2-11111-01-00, 4J2-11111-00-00

(QTY 1) NICHE 519-CCY2223L Engine Cylinder

Substitute For OEM Part Numbers(s): 4J2-11311-01-00, 4J2-11311-00-00, 3L5-11311-01-00

(QTY 1) NICHE 2-BPR4HS Spark Plug

Substitute For OEM Part Numbers(s): BPR4HS, 92070-S023, 92070-S022, 92070-S015, 92070-2061, 09482-00290, 09482-00186, 09482-00138, 09482-00137, 09482-00038, 09482-00036

(QTY 1) NICHE 519-KGS2223K Cylinder Head & Base Gasket Kit

Substitute For OEM Part Numbers(s): 517-11181-01-00, 517-11181-00-00, 3PT-11351-00-00, 107-11181-00-00, 102-11181-00-00

(QTY 1) NICHE 519-KPS2223T Piston Kit

Substitute For OEM Part Numbers(s): 18U-11636-00-00, 18U-11635-00-00

(QTY 1) NICHE 519-KST2223D Cylinder Stud Kit

Substitute For OEM Part Numbers(s): 95780-06500-00, 95380-06600-00, 90116-06418-00, 90116-06269-00

Fits The Following OEM Models:

Yamaha PW50 Y-Zinger: 1981-1999
Yamaha PW50: 1981-2017