ORO2U Dirt Catalogue - Section E - Engine and Performance.

Athena

Top End Piston Kits

YAMAHA 2-Stroke Models

Years

Size

Part No. 56-T1016 56-T1021 56-T1022 56-T1026 56-T1031 56-T1031 Part No. 56-T1003 56-T1005 56-T1006 56-T1007 56-T1003 56-T1005 56-T1006 56-T1007 56-T1005 56-T1049 56-T1050 56-T1051 56-T1052 56-T1050 56-T1051 56-T1050 56-T1051 56-T1052

2018 - 25

YZ 65 YZ 85 YZ 85

43.5mm

Athena Top End Piston Kits The Perfect Combination Of Two Essential Engine Components

2002 - 18 47.5mm

2019 - 25

47.5mm

Having two products in one kit that work perfectly together for an excellent result. Athena presents on the market the new Top End Piston Kit which includes a forged 4-stroke piston and the top end gasket kit.

YZ 125 YZ 250

2005 - 21 54mm

1999 - 25 2016 - 25

66.4mm 66.4mm

YZ 250X

Performance, Durability, Smoothing The pistons for 4-stroke Off-Road motorcycles are made by reverse extrusion and produced with state-of-the-art numerical control (CNC) machines. Athena pistons are made of special high-performance aluminum alloy with high silicon content that guarantee the same reliability of the OE piston, while at the same time providing greater resistance and excellent performance. The perfectly smooth profile ensures a regular flow and the perfect flame propagation. Some pistons’ skirts are moreover treated with a molybdenum disulfide coating applied by screen printing which further reduce friction to enhance performance and durability. Piston rings guarantee less friction with the cylinder and therefore a higher performance. The segments included, Made in Japan, have a wear-resistant coatings (PVD or chromium nitride) to increase the retain and the durability. Seal, Reliability Due to its experience in the sector of over 40 years, Athena also boasts an important reputation for the reliability of its gaskets. The Athena gasket kits are based on solid know-how, constant technological development lead by an internal team of engineers and designers; the production carried out strictly following the strict parameters set by the manufacturers. The use of the latest generation lasers guarantees perfect cutting quality. Furthermore, Athena has a wide availability of raw materials, performs surface treatments to compensate for surface irregularities and follows material stress-relieving processes to improve sealing in the most critical areas.

4-Stroke Models

Years

Size

WR 250F WR 250F WR 250F WR 250F YZ 250F YZ 250F YZ 250F YZ 250F YZ 250FX YZ 450F YZ 450F YZ 450F YZ 450F YZ 450FX YZ 450FX WR 450F WR 450F WR 450F

2008 - 13 77mm

2015 2018

77mm 77mm 77mm

2020 - 25

2008 - 13 77mm 2014 - 15 77mm 2016 - 18 77mm

2019 - 25

77mm 77mm

2015

2010 - 13 97mm 2014 - 17 97mm 2018 - 19 97mm 2020 - 22 97mm 2016 - 18 97mm 2019 - 20 97mm 2016 - 18 97mm 2019 - 20 97mm 2021 - 23 97mm

*Please visit our website for current prices

E-mail: sales@oro2u.com

www.oro2u.com

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