Piston Kits
Vertex
YAMAHA Models - 2 Stroke
Piston Type Years Size
Piston Kit
Piston Rings 56-R9461.V 56-R9462.V 56-R9338.V 56-R9339.V 56-R9496.V 56-R9341.V 56-R9412.V 56-R9496.V 56-R9496.V 56-R902.V 56-R9332.V 56-R9332.V 56-R9332.V 56-R9332.V 56-R9332.V 56-R9332.V 56-R9332.V 56-R9332.V 56-R9332.V 56-R9332.V 56507805400 56-R9500.V 56-R9342.V 56-R9343.V 56-R902.V 56509905400 56-R9424.V 56-R911.V 56-R911.V 56-R911.V 56-R9311.V 56-R9311.V 56-R9311.V 56-R904.V 56-R9348.V 56-R9312.V
Piston Pin
Piston Clips
Small End Bearing 56-6041.VERTEX 56-6041.VERTEX 56-821.VERTEX 56-821.VERTEX 56-821.VERTEX 56-821.VERTEX 56-821.VERTEX 56-821.VERTEX 56-821.VERTEX 56-820.VERTEX 56-820.VERTEX 56-820.VERTEX 56-836.VERTEX 56-836.VERTEX
2018 - 23 43.5mm 24352A 2018 - 23 45.5mm 24352200 1993 - 01 46mm 22443A 1993 - 01 47mm 22500A
YZ 65
715040 715040 715084 715084 715378 715378 715286 715378 715378 715131 715061 715061 711127 711127 711127 711127 711127 711127 711127 711127 711162 711127 711127 711127 711127 711127 715389 711117 711117 711117
72065 72065 72050 72050 72050 72050 72050 72050 72050 72055 72055 72055 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72074 72074 72074 72074 72074 72074 72074 72074 72074
YZ 65 (Big Bore)
YZ 80
YZ 80 (USA)
YZ 85
Race Evolution 2002 - 18 47.5mm 24503A
2002 - 18 49.5mm 22871200 2002 - 18 52.5mm 23628A 2002 - 23 47.5mm 24370A
YZ 85 (Big Bore)
YZ 85 Supermini (Big Bore)
YZ 85 YZ 85
Race Evolution 2002 - 23 47.5mm 24503A
YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125 YZ-WR 125
1992 - 93
56mm
22152A
1994 - 96 54mm 22224A 1994 - 96 54mm 22359A
Race
1997 1997
54mm 22441A 54mm 22452A
Race
1998 - 01 54mm 22520A 1998 - 01 54mm 22549A 2002 - 04 54mm 22806A 2002 - 04 54mm 22808A 2005 - 21 54mm 23119A 2005 - 21 54mm 23120A
Pro Race
56-814.VERTEX 56-814.VERTEX 56-814.VERTEX 56-814.VERTEX 56-814.VERTEX
Pro Race
Pro Race
Race Evolution 2005 - 23 54mm 24444A
2022 - 23 54mm 24570A 2022 - 23 54.5mm 24570050
2022 - 23 55mm 2022 - 23 56mm
24570100 24570200
2022 - 23 54mm 24571A 2005 - 19 58mm 23335A 1990 - 95 68mm 22154A 1996 - 98 68mm 22356A
Pro Race
YZ-WR 144 (Big Bore)
YZ-WR 250 YZ-WR 250 YZ-WR 250 YZ-WR 250 YZ-WR 250
56-8090.VERTEX 56-8090.VERTEX 56-8090.VERTEX 56-8010.VERTEX 56-8010.VERTEX 56-8010.VERTEX
1998
68mm 22522A
1999 - 23 66.4mm 22584A 1999 - 23 66.4mm 22591A 1999 - 23 66.4mm 22645A 1999 - 23 67.5mm 22584_110 1999 - 23 68mm 22584_160 1999 - 23 72mm 24079A
56-7924.V 56-7924.V 56-7924.V
Race
Pro Race
YZ-WR 250 (Pro Race)
YZ-WR 250 YZ-WR 250
715372 715372
56-7924.V
56-8010.VERTEX
YZ-WR 250 (Big Bore)
Models - 4 Stroke
Piston Type Years Size
Piston Kit
Piston Rings Piston Pin
Piston Clips
Small End Bearing
WR 250F Std. Comp. 12.5:1
2001 - 14 77mm 23127A 2001 - 14 77mm 22812A 2001 - 14 77mm 22889A 2001 - 04 79mm 22954200 2005 - 14 79mm 23127200 2005 - 14 80mm 23129A 2005 - 14 84mm 23233700 2015 - 17 77mm 23941A 2015 - 17 77mm 23942A
56-R9497.V 56-R917.V 56-R9330.V 56-R9466.V 56-R9466.V 56-R9360.V 56-R9362.V 56-R9467.V 56-R9414.V 56-R9414.V 56-R9360.V 56-R9414.V 56-R9414.V 56-R9414.V 56-R9360.V 56-R9414.V 56-R9414.V 56-R9414.V 56-R9360.V 56-R9330.V 56-R9466.V
715381 715381 715381 715381 715381 715381 715381 715380 715380 711195 715380 711195 711195 711195 715380 711195 711195 711195 711195 715381 715381
72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055
- - - - - - - - - - - - - - - - - - - - -
WR 250F High Comp. 13.5:1 (2 Rings) WR 250F High Comp. 13.5:1 (3 Rings)
WR 250F (Big Bore)
WR 250F Std. Comp. 12.5:1 (Big Bore) WR 250F Std. Comp. 13.5:1 (Big Bore) WR 250F Std. Comp. 12.5:1 (Big Bore XL)
WR 250F Std. Comp. 13.5:1 WR 250F High Comp. 14.2:1 WR 250F High Comp. 14.4:1
GP Racer Choice 2015 - 17 77mm 23954A
2015 - 17 80mm 23943A 2018 - 19 77mm 24109A 2018 - 19 77mm 24117A
WR 250F (Big Bore)
WR 250F Std. Comp. 13.5:1 WR 250F High Comp. 14.2:1 WR 250F High Comp. 13.7:1
GP Racer Choice 2018 - 19 77mm 24118A
WR 250F Std. Comp. 13.5:1 (Big Bore)
2018 - 19 80mm 23943A 2020 - 23 77mm 24371A 2020 - 23 77mm 24381A
WR 250F Std. Comp. 13.8:1 WR 250F High Comp. 14.7:1 WR 250F High Comp. 14.7:1
GP Racer Choice 2020 - 23 77mm 24382A
2020 - 23 77mm 24405A 2001 - 04 77mm 22805A 2001 - 04 79mm 22954200
WR 250F Std. Comp. 13.8:1 (Big Bore)
YZ 250F Std. Comp. 12.5:1
YZ 250F (Big Bore)
*Please visit our website for current prices
* Note; Most Kits are available from standard size up to +2.00mm over size *
www.oro2u.com
Tel: 01597 822 666
Fax: 01597 825 224
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