- New
ATHENA Racing Forged Piston for KTM EXCF 450, MXC 450 and BETA RR 450 2002-2009
€236.90
Tax Included
The piston moves up and down in the cylinder to turn combustion into motion: this kit replaces it along with its rings, pin and clips.
Available in several sizes.
ATHENA offers this piston kit for KTM EXCF 450, MXC 450 and BETA RR 450 2002-2009. The piston slides in the cylinder and takes the force of the air-fuel combustion, passing it to the connecting rod and crankshaft.
Why choose a forged piston?
Instead of simply being cast, a forged piston is hot-pressed under very high pressure and then machined: its metal is denser and free of air pockets.
- Stronger when hot: it copes better with high revs, overheating and detonation.
- Lighter for the same strength: less stress on the connecting rod and bearings.
- Good to know: depending on the alloy, it expands a little more and is fitted with more clearance; slight noise when cold is normal.
- Why does it cost more? Forging tools, full machining and surface treatments cost more than simple casting.
Why choose ATHENA?
Athena, the Italian manufacturer founded in 1973, is an original-equipment supplier to manufacturers such as KTM and Ducati: the same standards for your replacement parts.
When should you replace the piston on your KTM EXCF 450?
Harder starting, loss of power, blue smoke, oil consumption or a knock when cold: these are the signs of a tired top end.
No manufacturer hour figure for this model. Cross-Mania guideline: compression check every 30 h in hard use and every 60 h for leisure.
Specifications and fitting tips
- Engine: 4-stroke
- Manufacturer part numbers: S4F08900003A (A), S4F08900003B (B)
Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 88.96 mm, B = 88.97 mm.
Spare parts and items to plan
- Piston rings : WOSSNER · VERTEX
- Piston pin : WOSSNER
- Piston pin clips : WISECO
- Top-end gasket kit : ATHENA · CENTAURO
- Spark plug : see the selection
- Coolant : LIQUI MOLY 1 L · TWIN AIR
- 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50
Compatibility
Check the exact model and year of your bike in the list below before ordering.
Fits:
BETA RR 450 2009
BETA RR 450 2008
BETA RR 450 2007
BETA RR 450 2006
BETA RR 450 2005
KTM EXCF 450 2007
KTM EXCF 450 2006
KTM EXCF 450 2005
KTM EXCF 450 2004
KTM EXCF 450 2003
KTM EXCF 450 2002
KTM MXC 450 2007
KTM MXC 450 2005
KTM MXC 450 2004
KTM MXC 450 2003
S4F08900003A
5 Items
Specific References
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The piston moves up and down in the cylinder to turn combustion into motion: this kit replaces it along with its rings, pin and clips.
Available in several sizes.
ATHENA Racing Forged Piston for KTM EXCF 450, MXC 450 and BETA RR 450 2002-2009
€236.90
Tax Included