Vertex
Piston Kits
YAMAHA Models - 4 Stroke YZ 250F Std. Comp. 13.5:1
Piston Type Years Size
Piston Kit
Piston Rings Piston Pin
Piston Clips
2008 - 13 77mm 2008 - 13 77mm
.V
715381 715381 711195 715380 715380 711195 715380 711195 711195 711195 711195 711195 711195 711195 711195 715405 715405 711144 711144 711144 711144 711144 711144 711144 711144 715382 715382 715382 715382 715382 715405 715405 711193 715405 715425 715425 715425 715425 715425 715425 715425 715425 715425 715425 715382 715382 715382 715382 715382 715405 715405 711193 715405 715405 715405 711193 715425 715425 715425 715425 715425 715425 715425
23391A 23394A 23738A 23941A 23942A 23954A 23943A 24109A 24117A 24118A 24220A 24371A 24381A 24382A 24405A 22567A 22567A 22605A 22651A 22891A
56-R9330
72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72055 72074 72074 72090 72090 72090 72090 72090 72090 72090 72090 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074 72074
YZ 250F High Comp. 13.9:1 (2 Rings) YZ 250F High Comp. 14.2:1 YZ 250F Std. Comp. 13.5:1 YZ 250F High Comp. 14.2:1 YZ 250F High Comp. 14.4:1 YZ 250F Comp. 13.5:1 (Big Bore) YZ 250F Std. Comp. 13.5:1 YZ 250F High Comp. 14.2:1 YZ 250F High Comp. 13.7:1 YZ 250F High Comp. 13.7:1 YZ 250F Std. Comp. 13.8:1 YZ 250F High Comp. 14.7:1 YZ 250F High Comp. 13.85:1 YZ 250F Comp. 13.8:1 (Big Bore) WR 400F Std. Comp. 12.5:1 YZ 400F Std. Comp. 12.5:1 WR 426F Std. Comp. 12.5:1 WR 426F Std. Comp. 12.5:1
56-R917.V 56-R917.V
GP Racer Choice 2008 - 13 77mm
2014 - 15 77mm 2014 - 15 77mm
.V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V
56-R9467 56-R9414 56-R9414 56-R9360 56-R9414 56-R9414 56-R9414 56-R9414 56-R9414 56-R9414 56-R9414 56-R9360 56-R9300 56-R9300 56-R9468 56-R9402 56-R9334 56-R9469 56-R9468 56-R9402 56-R9334 56-R9469 56-R9334 56-R9402 56-R9394 56-R9374 56-R9316 56-R9470 56-R9471 56-R9471 56-R9375 56-R9470 56-R9471 56-R9471 56-R9472 56-R9470 56-R9471 56-R9471 56-R9472 56-R9470 56-R9471 56-R9334 56-R9402 56-R9394 56-R9374 56-R9316 56-R9470 56-R9471 56-R9471 56-R9375 56-R9470 56-R9471 56-R9471 56-R9470 56-R9471 56-R9471 56-R9472 56-R9470 56-R9471 56-R9471
GP Racer Choice 2014 - 15 77mm
2014 - 18 80mm 2016 - 18 77mm 2016 - 18 77mm
GP Racer Choice 2016 - 18 77mm
US Pro
2017 - 18 77mm 2019 - 26 77mm 2019 - 26 77mm
GP Racer Choice 2019 - 26 77mm
2019 - 26 80mm 1998 - 02 92mm 1998 - 99 92mm 2001 - 02 95mm 2001 - 02 95mm 2001 - 02 95mm 2001 - 02 97mm 2000 - 02 95mm 2000 - 02 95mm 2000 - 02 95mm 2000 - 02 97mm 2003 - 15 95mm 2003 - 15 95mm 2003 - 15 97mm 2003 - 15 98mm 2005 - 15 100mm 2016 - 18 97mm 2016 - 18 97mm
.EACH .EACH
Race
WR 426F High Comp. WR 426F (Big Bore)
22962200
YZ 426F Std. Comp. 12.5:1 YZ 426F Std. Comp. 12.5:1
22605A 22651A 22891A
Race
YZ 426F High Comp. YZ 426F (Big Bore)
22962200
WR 450F Std. Comp. 12.5:1
.EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH .EACH
22915A 22896A 22964A 23404A
WR 450F High Comp. 13.5:1 (2 Rings) WR 450F Std. Comp. 12.5:1 (Big Bore) WR 450F Std. Comp. 12.5:1 (Big Bore) WR 450 Std. Comp. 12.5:1 (Big Bore XL)
23270500
WR 450F Std. Comp. 12.5:1 WR 450F High Comp. 13.5:1 WR 450F High Comp. 13.7:1
23958A 23959A 23960A 23655A 24270A 24271A 24272A 24369A 24448A 24449A 24450A 24461A 24638A 24639A 22915A 22896A 22964A 23404A
GP Racer Choice 2016 - 18 97mm
WR 450F Std. Comp. 12.5:1 (Big Bore)
2016 - 18 99mm 2019 - 20 97mm 2019 - 20 97mm
WR 450F Std. Comp. 12.7:1 WR 450F High Comp. 13.8:1 WR 450F High Comp. 13.3:1
GP Racer Choice 2019 - 20 97mm
WR 450F Comp. 12.7:1
2019 - 20 99mm 2021 - 23 97mm 2021 - 23 97mm
WR 450F Std. Comp. 12.8:1 WR 450F High. Comp. 13.8:1 WR 450F High. Comp. 13.45:1 WR 450F Std. Comp. 12.5:1 (Big Bore)
GP Racer Choice 2021 - 23 97mm
2021 - 23 99mm 2024 - 26 97mm
WR 450F
. VERTEX . VERTEX
WR 450F High Comp. 13.6:1 YZ 450F Std. Comp. 12.5:1
GP Racer Choice 2024 - 26 97mm
2003 - 09 95mm 2003 - 09 95mm 2003 - 09 97mm 2003 - 09 98mm 2003 - 09 100mm 2010 - 13 97mm 2010 - 13 97mm
.V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V .V
YZ 450F High Comp. 13.5:1 (2 Rings) YZ 450F Std. Comp. 12.5:1 (Big Bore) YZ 450F Std. Comp. 12.5:1 (Big Bore) YZ 450F Std. Comp. 12.5:1 (Big Bore XL)
23270500
YZ 450F Std. Comp. 12.5:1 YZ 450F High Comp. 13.5:1 YZ 450F High Comp. 13.6:1
23562A 23563A 23739A 23655A 23958A 23959A 23960A 24270A 24271A 24272A 24369A 24448A 24449A 24450A 24461A 24638A 24639A
GP Racer Choice 2010 - 13 97mm
2010 - 17 99mm 2014 - 16 97mm 2014 - 16 97mm
YZ 450F (Big Bore XL)
YZ 450F Std. Comp. 12.5:1 YZ 450F High Comp. 13.5:1 YZ 450F High Comp. 13.7:1 YZ 450F Std. Comp. 12.7:1 YZ 450F High Comp. 13.8:1 YZ 450F High Comp. 13.3:1
GP Racer Choice 2014 - 16 97mm
2018 - 19 97mm 2018 - 19 97mm
GP Racer Choice 2018 - 19 97mm
YZ 450F Std. Comp. 12.7:1 (Big Bore)
2018 - 19 99mm 2020 - 22 97mm 2020 - 22 97mm
YZ 450F Std. Comp. 12.8:1
YZ 450F High Comp. YZ 450F High Comp.
GP Racer Choice 2020 - 22 97mm
2020 - 22 97mm 2023 - 26 97mm
YZ 450F Std. Comp. 12.8:1 (Big Bore)
715425 715425
.EACH .EACH
YZ 450F
. VERTEX . VERTEX
72074 72074
56-R9470 56-R9471
YZ 450F High Comp.
GP Racer Choice 2023 - 26 97mm
* Note; Most Kits are available from standard size up to +2.00mm over size *
*Please visit our website for current prices
E-mail: sales@oro2u.com
www.oro2u.com
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