ORO2U Dirt Catalogue - Section E - Engine and Performance.

Vertex

Piston Kits

Vertex Piston Kits VERTEX pistons have an outstanding reputation for quality and performance. Each gravtiy cast piston is created with only premium aluminium alloys utilizing an 12-21% silicon content. The silicon content in VERTEX pistons is crucial to the quality of the piston - it’s critical in decreasing thermal expansion which, when an engine reaches normal operating temperatures, can change the geometry of the piston. Controlling this expansion means VERTEX pistons can be run at tighter tolerances for more power, less noise and a longer lifespan of the piston. When it comes to power and perforance, VERTEX pistons are hard to beat. Forged to the highest quality 2618 aluminium alloy. To aid in the break-in process, and reduce wear, VERTEX pistons utilizes a unique Molybdenum Disulphide (MOS2) coating on the piston skirt.

KTM Models - 4 Stroke

Piston Type Years Size

Piston Kit

Piston Rings 56-R9315.V 56-R9315.V 56-R9402.V 56-R9402.V 56-R9402.V 56-R9402.V 56-R9402.V 56-R9402.V 56-R9400.V 56-R915.V 56-R915.V 56-R9318.V 56-R9430.V 56-R9430.V 56-R9402.V 56-R9402.V 56-R9402.V 56-R9402.V 56-R9402.V 56-R9402.V

Piston Pin

Piston Clips

Small End Bearing

EXC 450F Std. Comp. 11.0:1 EXC 450F High Comp. 12.0:1 EXC 450F Std. Comp. 11.8:1 EXC 450F High Comp. 12.3:1 EXC 450F Std. Comp. 11.8:1 EXC 450F High Comp. 12.8:1 EXC 450R Std. Comp. 11.9:1 EXC 450R High Comp. 12.8:1

2003 - 07 89mm 23329A 2003 - 07 89mm 23340A 2012 - 16 95mm 23859A 2012 - 16 95mm 23860A 2017 - 24 95mm 24209A 2017 - 24 95mm 24211A 2008 - 11 95mm 23379A 2008 - 11 95mm 23380A 2008 - 11 102mm 23368700 2003 - 06 95mm 22941A 2003 - 06 95mm 22968A 2003 - 06 97mm 22957200 2007 - 12 97mm 23342A 2007 - 12 97mm 23343A 2013 - 15 95mm 23849A 2013 - 15 95mm 23850A

715108 715108 715436 715436 715471 715471 715400 715400 715400 711140 711140 711140 715400 715400 715436 715436 715436 711197 711197 711197

72075 72075 72099 72099 72099 72099 72090 72090 72090 72075 72075 72075 72090 72090 72099 72099 72099 72099 72099 72099 72099 72099 72099 72073 72075 72075 72090 72090 72090

- - - - - - - - - - - - - - - - - - - - - - - - - - - - -

EXC 450R Std. Comp 11.9:1 (Big Bore XL)

SX 450F Std. Comp. 12.0:1 SX 450F High Comp. 13.0:1

SX 450F Std. Comp. 12.0:1 (Big Bore) SX 450F Std. Comp. 12.5:1 SX 450F High Comp. 13.2:1 SX 450F Std. Comp. 12.6:1 SX 450F High Comp. 13.2:1 SX 450F High Comp. 13.5:1 SX 450F Std. Comp. 12.6:1 SX 450F High Comp. 13.6:1 SX 450F High Comp. 13.3:1 SX 450F Std. Comp. 13.1:1 SX 450F High Comp. 13.7:1 EXC 500 Std. Comp. 11.8:1 SX-F 505 High Comp. 13.5:1 SX-EXC 520 Std. Comp, 11.0:1 SX-EXC 525 Std. Comp. 11.0:1 EXC 530R Std. Comp. 11.9:1 EXC 530R High Comp. 12.7:1

GP Racer Choice 2013 - 15 95mm 23871A

2016 - 22 95mm 24099A 2016 - 22 95mm 24112A

GP Racer Choice 2016 - 22 95mm 24113A

2023 - 24 95mm 24618A 2023 - 24 95mm 24635A 2012 - 23 95mm 23762A 2008 - 09 100mm 23417A 2000 - 02 95mm 22942A 2003 - 07 95mm 22942A 2008 - 11 95mm 23381A 2008 - 11 95mm 23382A 2008 - 11 102mm 23369700

590295000004 715471 590295000004 711241

56-R9402.V 56-R9316.V 56-R915.V 56-R915.V 56-R9402.V 56-R9402.V 56-R9400.V

711197 711174 711140 711140 715400 715400 715400

EXC 530R Std. Comp. 11.9:1 (Big Bore XL)

RIEJU Models - 2 Stroke

Piston Type Years Size

Piston Kit

Piston Rings

Piston Pin

Piston Clips 72074.EACH 72074.EACH

Small End Bearing

MR 250 MR 300

2021 2021

66.4mm 23249A 72mm 23761A

56-R9311.VER 715372

56-R9312.V

715372

SHERCO Models - 2 Stroke

Piston Type Years Size

Piston Kit

Piston Rings

Piston Pin

Piston Clips

Small End Bearing

2018 - 24 54mm 24660A 2017 - 24 66.4mm 24621A 2016 - 24 72mm 24622A

SE 125R SE 250R SE 300R Trial 125 Trial 200 Trial 250 Trail 290

56-R9311.VER 71161 56-R9312.VER 71161

72074.EACH 72074.EACH

56mm

22623A

56-R9405.V 56-R908.V 56-R9455.V 56-R9032.V

715242 715258 711125 711125

72058 72058 72060 72047

64mm 22624A 72.8mm 22674A 76mm 22625A

* 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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