top end / off-road / 2-stroke Model Off-Road • 2-Stroke
Years
Stock Engine Bore x Stroke
Bore Size
Piston Type & Coatings
Cylinder & Machining Requirements
66.4 x 72.0 67.0 x 70.8
72.0
ElectraCoated ArmorGlide TiN Coated Ring Pro-Lite
Bore / Replate
SUZUKI RM250 NOTE: Cylinder, cylinder head, and powervalve modifications required RMX250
2003-2010
RMX250
1993-1999
67.0 x 70.8
PW50
1985-1987 1990-2017
40.0 x 39.2
MX80 TY80 GT1
1980-1982 1974-1975 1973-1975
47.0 x 42.0
PW80 BW80
1991-2006 1986-1990
47.0 x 45.6
YZ80
1974-1975
47.0 x 42.0
YZ80
1976-1980
49.0 x 42.0
YZ80
1982-1983
47.0 x 45.6
YZ80
1984
YZ80
1985
48.0 x 45.6 48.0 x 45.6
YZ80
1986-1987
1989-1992
67.0 67.5 68.0 69.0 67.0 67.5 68.0 69.0
Pro-Lite
Deglaze / Hone Bore / Replate Bore / Replate Bore / Replate Deglaze / Hone Bore / Replate Bore / Replate Bore / Replate
YAMAHA
72
48.0 x 45.6
40.0 40.5 41.0 41.5 42.0 47.0 47.5 48.0 48.5 47.0 47.5 48.0 48.5 49.0 47.0 47.5 48.0 48.5 49.0 49.5 50.0 50.5 51.0 47.0 48.0 48.5 49.0 48.5 49.0
Deglaze / Hone Bore & Hone Bore & Hone Bore & Hone Bore & Hone Deglaze / Hone Bore & Hone Bore & Hone Bore & Hone Deglaze / Hone Bore & Hone Bore & Hone Bore & Hone Bore & Hone Deglaze / Hone Bore & Hone Bore & Hone Bore & Hone Deglaze / Hone Bore & Hone Bore & Hone Bore & Hone Bore & Hone Deglaze / Hone Bore & Hone Bore & Hone Bore & Hone Deglaze / Hone Bore & Hone
48.0 48.5 49.0 49.5 50.0 48.0 48.5 49.0 49.5 50.0
Deglaze / Hone Bore & Hone Bore & Hone Bore & Hone Bore & Hone Deglaze / Hone Bore & Hone Bore & Hone Bore & Hone Bore & Hone