Piston Kits
Vertex
YAMAHA Models - 2 Stroke
Piston Type Years Size
Piston Kit
Piston Rings
Piston Pin
Piston Clips
Small End Bearing
2018 - 26 43.5mm 2018 - 26 45.5mm 1993 - 01 46mm 1993 - 01 47mm
YZ 65
.V .V .V .V
715040 715040 715084 715084 715286 715378 715378 715131 715378 715378 715061 715061 711127 711127 711162 711127 711127 711127 711127 711127 711127 711127 711127 711127 711127 715389 711117 711117 711117 711127 715372 715372 56-7924 56-7924 56-7924 56-7924
. VERTEX . VERTEX
24352A
56-R9461 56-R9462 56-R9338 56-R9339
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
56-6041 56-6041 56-821 56-821 56-821 56-821 56-821 56-821 56-821 56-820 56-820 56-820 56-836 56-836
YZ 65 (Big Bore)
24352200
YZ 80
. VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX
22443A 22500A 24503A
YZ 80 (USA)
YZ 85
Race Evolution 2002 - 18 47.5mm
56-R9496.V
YZ 85 (Big Bore)
2002 - 18 49.5mm 2002 - 18 52.5mm 2002 - 26 47.5mm
.V .V
22871200
56-R9341 56-R9412
YZ 85 Supermini (Big Bore)
23628A 24370A 24503A 22152A 22224A 22359A 22441A 22452A 22520A 22549A 22806A 22808A 23119A 23120A 24444A 24570A
YZ 85 YZ 85
56-R9496.V 56-R9496.V
Race Evolution 2002 - 26 47.5mm
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
.V
56-R902
1994 - 96 54mm 1994 - 96 54mm
.V .V .V .V .V .V .V .V .V .V
56-R9332 56-R9332 56-R9332 56-R9332 56-R9332 56-R9332 56-R9332 56-R9332 56-R9332 56-R9332
Race
1997 1997
54mm 54mm
Race
1998 - 01 54mm 1998 - 01 54mm 2002 - 04 54mm 2002 - 04 54mm 2005 - 21 54mm 2005 - 21 54mm
Pro Race
56-814 56-814 56-814 56-814 56-814
Pro Race
Pro Race
Race Evolution 2005 - 26 54mm
56507805400 56-R9500.V
2022 - 26 54mm 2022 - 26 54.5mm 2022 - 26 55mm 2022 - 26 56mm 2022 - 26 54mm 2005 - 19 58mm 1990 - 95 68mm 1996 - 98 68mm
.V .V
24570050 24570100 24570200
56-R9342 56-R9343
.V
56-R902
Pro Race
56509905400
24571A 23335A 22154A 22356A 22522A 22584A 22591A 22645A
.V
YZ-WR 144 (Big Bore)
56-R9424 56-R911 56-R911
YZ-WR 250 YZ-WR 250 YZ-WR 250 YZ-WR 250 YZ-WR 250
.V .V .V
.EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH
. VERTEX . VERTEX . VERTEX . VERTEX . VERTEX . VERTEX
56-8090 56-8090 56-8090 56-8010 56-8010 56-8010
1998
68mm
56-R911
1999 - 26 66.4mm 1999 - 26 66.4mm 1999 - 26 66.4mm 1999 - 26 67.5mm 1999 - 26 68mm 1999 - 26 72mm
.V .V .V
. VERTEX . VERTEX . VERTEX
56-R9311 56-R9311 56-R9311
Race
YZ-WR 250 (Pro Race)
Pro Race
YZ-WR 250 YZ-WR 250
_110 _160
56-R904.V 56-R9348.V
22584 22584
.V
. VERTEX
. VERTEX
YZ-WR 250 (Big Bore)
24079A
56-R9312
56-8010
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 2001 - 14 77mm 2001 - 14 77mm 2001 - 04 79mm 2005 - 14 79mm 2005 - 14 80mm 2005 - 14 84mm 2015 - 17 77mm 2015 - 17 77mm
56-R9497.V 56-R917.V
715381 715381 715381 715381 715381 715381 715381 715380 715380 711195 715380 711195 711195 711195 715380 711195 711195 711195 711195 715381 715381 715381 715381
- - - - - - - - - - - - - - - - - - - - - - -
23127A 22812A 22889A
72055 72055 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)
.V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V
56-R9330 56-R9466 56-R9466 56-R9360 56-R9362 56-R9467 56-R9414 56-R9414 56-R9360 56-R9414 56-R9414 56-R9414 56-R9360 56-R9414 56-R9414 56-R9414 56-R9360 56-R9330 56-R9466
WR 250F (Big Bore)
22954200 23127200
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)
23129A
23233700
WR 250F Std. Comp. 13.5:1 WR 250F High Comp. 14.2:1 WR 250F High Comp. 14.4:1
23941A 23942A 23954A 23943A 24109A 24117A 24118A 23943A 24371A 24381A 24382A 24405A 22805A
GP Racer Choice 2015 - 17 77mm
2015 - 17 80mm 2018 - 19 77mm 2018 - 19 77mm
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
WR 250F Std. Comp. 13.5:1 (Big Bore)
2018 - 19 80mm 2020 - 26 77mm 2020 - 26 77mm
WR 250F Std. Comp. 13.8:1 WR 250F High Comp. 14.7:1 WR 250F High Comp. 13.85:1
GP Racer Choice 2020 - 26 77mm
2020 - 26 77mm 2001 - 04 77mm 2001 - 04 79mm 2001 - 07 77mm 2001 - 07 77mm
WR 250F Std. Comp. 13.8:1 (Big Bore)
YZ 250F Std. Comp. 12.5:1
YZ 250F (Big Bore)
22954200
YZ 250F High Comp. 13.5:1 (2 Rings) YZ 250F High Comp. 13.5:1 (3 Rings)
56-R917.V
22812A 22889A
.V
56-R9330
YZ 250F Std. Comp. 12.5:1
2005 - 07 77mm
.V
715381
-
23127A
56-R9330
72055
YZ 250F Std. Comp. 13.5:1 (Big Bore)
2005 - 13 80mm
.V
715381
-
23129A
56-R9360
72055
*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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