Cylinder overhaul kit Athena (Piston+Smeriglio gaskets set) for Honda CRF 450 RX 21-25 Top End

Select the desire piston size from the drop-down menù (value in mm)

All cylinder overhaul kits are sold complete with everything needed for installation: Athena piston dedicated + Smeriglio gaskets set.

THE PERFECT COMBINATION OF TWO ESSENTIAL ENGINE COMPONENTS

The guarantee of having in a single kit two products 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 corresponding emery series.
Athena studies, develops and tests all the technologies and materials of its pistons internally, while also engineering the entire development of compatible seals. After replacing a piston, this kit, designed in perfect harmony, offers very high performance and ensures maximum reliability.

PERFORMANCE, DURABILITY, SMOOTHING

The pistons for 4-stroke Off-Road motorcycles are hot forged by reverse extrusion and produced with state-of-the-art numerical control (CNC) machines. Athena pistons are produced in silicon-based aluminum alloy that ensure reliability equal to the original and, at the same time, greater strength and excellent performance. The perfectly smooth profiles thus ensure a regular flow and ideal propagation of the flame front.
On the skirt of some pistons there is also a screen-printed surface coating in sintered Molybdenum Disulfide, which allows to increase smoothness, performance and durability, further reducing friction and noise.

The piston rings of this piston guarantee less friction with the cylinder and therefore a higher yield. The segments included, Made in Japan, are of the latest generation: in special steel with PVD coating or chromium nitrides, they adapt perfectly to the cylinder walls even with low tangential load.

SEAL, RELIABILITY

Due to its experience in the sector of over 40 years, Athena also boasts an important reputation for the reliability of its seals. The Athena gasket kits are based on solid know-how, constant technological development conducted by an internal team of engineers and designers and production carried out strictly following the strict parameters set by the manufacturers. The use of the latest generation lasers, in fact, guarantees perfect cutting quality.
Athena also 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.

The motorcycle emery series contained in the kit includes the gaskets necessary for the overhaul of the cylinder head and the thermal part of the engine.

Find out now the Top End Piston Kit best suited to your bike by consulting the compatibility tables.


All Athena items produced in displacements and powers higher than those required by the road code of the user's country are intended for competitive use only. Athena declines all responsibility for any use of the product contrary to national standards.

Products intended for competitive-sporting use and which are used in high-performance or high-speed applications are excluded from the guarantee of conformity, unless it is an obvious case of defects.