ORO2U Dirt Catalogue - Section E - Engine and Performance.

Piston Kits

Vertex

Vertex Piston Kits - 2 Stroke As the OE supplier of 2-stroke pistons to KTM, Vertex pistons has 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. Vertex Piston Kits - 4 Stroke When it comes to power and perforance, Vertex 4 stroke pistons are hard to beat. Forged to the highest quality 2618 aluminium alloy, Vertex pistons are perfectly suited to handle the rigors and high pressures of todays modern 4-stroke engines. To aid in the break-in process, and reduce wear, Vertex pistons utilizes a unique Molybdenum Disulphide (MOS2) coating on the piston skirt.

What really sets Vertex pistons apart from the competition are the unique piston profiles and compression ratios that are offered in A, B, C and D sizes. This variation in the sizing, a mere 0.004”, allows the piston to be perfectly sized to the cylinder for maximizing power and performance while reducing blow-by oil consumption.

KTM Models - 2 Stroke

Piston Type Years Size

Piston Kit

Piston Rings 56-R9030.V 56-R9030.V 56-R9403.V 56-R9403.V 56-R9421.V 56-R9404.V 56-R9339.V 56-R9404.V 56-R9404.V 56-R9339.V 56-R9339.V 53008004700 56-R9339.V 56-R9422.V 56-R9422.V 56-R9422.V 56-R901.V 53010005242 56-R901.V 56-R901.V 56-R9331.V 56-R9307.V 56-R9331.V 56507805400 56-R9307.V 56-R9331.V 56-R9307.V 56-R9307.V 56-R9424.V 56-R901.V 56-R901.V 56-R9331.V 56-R9307.V 56-R9307.V 56-R9331.V 56507805400 56-R9307.V 56-R9331.V 56-R9307.V 56-R9307.V 56-R9307.V 56-R9424.V 56-R9331.V 56-R9307.V 56-R9331.V 56507805400 56-R9307.V 56-R9331.V 56-R9307.V 56-R9307.V 56-R9424.V

Piston Pin

Piston Clips

Small End Bearing

EXC 50 EXC 50

1994 - 97 39.5mm 22171A 1998 - 00 39.5mm 22525AB 2001 - 08 39.5mm 22813AB 2009 - 23 39.5mm 23429AB 1997 - 99 43.5mm 22402A 2000 - 08 45mm 22481AB 2000 - 08 47mm 22858200 2009 - 23 45mm 23430AB

715036 715036 715036 715036 715332 715332 715047 715332 715332 715378 715378 711119 715378 711151 711151 711151 711127 711127 711127 711127 711127 711127 711127 711127 711127 711127 715389 711127 711127 711127 711127 711127 711127 711127 711127 711127 711127 715389 711127 711127 711127 711127 711127 711127 715389

72065 72025 72065 72065 72065 72065 72065 72065 72065 72050 72050 72050 72050 72050 72050 72050 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071 72071

SX 50 SX 50 SX 60 SX 65

56-838.VERTEX 56-838.VERTEX 56-827.VERTEX 56-827.VERTEX 56-827.VERTEX 56-827.VERTEX 56-827.VERTEX 56-7997.VERTEX 56-7997.VERTEX 56-7997.VERTEX 56-7997.VERTEX 56-7997.VERTEX 56-7997.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX 56-800.VERTEX

SX 65 (Big Bore)

SX 65 SX 65

Race Evolution 2009 - 23 45mm 24447AB

2003 - 23 47mm 24212A 2003 - 23 47mm 24279A

SX-EXC 85

Race

SX-EXC 85 FlatHead (testa piatta)

Race Evolution 2003 - 23 47mm 24446A

SX-EXC 85 Single Ring 0,8

2003 - 23 47mm 24355A 2004 - 11 52mm 22991A 2004 - 11 52mm 24280A 2003 - 16 52mm 23879A

Race

SX-EXC 85 12⁰ Head

SX 105

Race

SX 105 FlatHead (testa piatta)

SX 112 Cast Stroker SX-GS 125 Dome SX-GS 125 Flat Head

1987 - 93 54.25 1987 - 93 54.25 1994 - 97 54.25 1998 - 00 54.25

22293A 22295A 22361A 22532A

EXC 125 EXC 125 EXC 125

2001 - 16 54mm 24234A

Race

2001 - 16 54mm 24243A

EXC 125 Single Ring EXC 125 Single Ring 0,8

Race Evolution 2001 - 16 54mm 24445A

Race Race

2001 - 16 54mm 24427A 2001 - 16 54mm 24428A

EXC 125 12⁰ Head - Single Ring

EXC 125 12⁰ Head

Pro Race

2001 - 16 54mm 24419A 2007 - 16 58mm 23384400 1994 - 97 54.25mm 22361A 1998 - 00 54.25mm 22532A 2001 - 21 54mm 24234A

EXC 125 Single Ring EXC 125 Big Bore

SX 125 SX 125 SX 125

2001 - 23 54mm 23928A 2001 - 23 54mm 24243A

SX 125

Race

SX 125 Single Ring SX 125 Single Ring 0,8

Race Evolution 2001 - 23 54mm 24445A

2001 - 23 54mm 24427A 2001 - 20 54mm 24428A 2001 - 23 54mm 24520A 2001 - 23 54mm 24419A 2007 - 17 58mm 23384400 2017 - 19 54mm 24234A

Race Race

SX 125 12⁰ Head - Single Ring

SX 125 12⁰ Head

Race

SX 125 12⁰ Head SX 125 Single Ring SX 125 (Big Bore)

Pro Race

XC-W 125

Race

2017 - 19 54mm 24243A

XC-W 125 Single Ring XC-W 125 Single Ring 0,8

Race Evolution 2017 - 19 54mm 24445A

Race Race

2017 - 19 54mm 24427A 2017 - 19 54mm 24428A

XC-W 125 12⁰ Head - Single Ring

XC-W 125 12⁰ Head

Pro Race

2017 - 19 54mm 24419A

XC-W 125 Single Ring XC-W 125 Big Bore

2017

58mm 23384400

*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

E50

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