ATHENA Cylinder Base Gasket for KTM EXC, EXCF, SX, SXS 250, 300, 400, 450, 520, 525, 540 and BETA RR 400, 450, 525 2000-2013

ATHENA offers this cylinder base gasket for KTM EXC, EXCF, SX, SXS 250, 300, 400, 450, 520, 525, 540 and BETA RR 400, 450, 525 2000-2013. The base gasket sits under the cylinder, on the crankcase. Crushed when tightened, it cannot be reused: replace it every time the cylinder comes off.

Why does the thickness matter?

The benefits:

• The OE thickness keeps the cylinder height intended by the manufacturer.
• Another thickness lets you correct piston-to-head clearance after machining or adjust the port timing of a 2-stroke.
• A new gasket keeps the bottom end sealed against oil and gases.

Why choose ATHENA?

Athena, founded in 1973 by Giovanni Mancassola near Vicenza and based in Alonte (Italy), designs gaskets, pistons and cylinder kits; it supplies original equipment to manufacturers such as KTM, Ducati, Fantic and Triumph.

When should you replace the base gasket on your KTM SX 250?

Every time the cylinder comes off: piston change, top-end rebuild or cylinder inspection. Oil or mixture seeping at the base of the cylinder also points to a tired gasket.

No manufacturer figure in hours for this model. Cross-Mania guideline: compression check every 20 h of hard use and every 40 h of leisure riding.

Specifications and fitting tips

• Thickness : 0.50 mm
• Manufacturer part number: S410270006061

Cross-Mania tip: Choose the OE thickness if the cylinder and head have not been machined; if in doubt, measure the squish with solder wire before final assembly.

Spare parts and items to plan

• Top-end gasket kit : ATHENA M752007300094 · ATHENA M752010500094
• Piston : PROX · WOSSNER
• Piston rings : VERTEX · WOSSNER
• Coolant : LIQUI MOLY 1 L · TWIN AIR

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
BETA RR 400 2009
BETA RR 400 2008
BETA RR 400 2007
BETA RR 400 2006
BETA RR 400 2005
BETA RR 450 2009
BETA RR 450 2008
BETA RR 450 2007
BETA RR 450 2006
BETA RR 450 2005
BETA RR 525 2009
BETA RR 525 2008
BETA RR 525 2007
BETA RR 525 2006
BETA RR 525 2005
KTM EXC 250 2006
KTM EXC 250 2005
KTM EXC 250 2004
KTM EXC 250 2003
KTM EXC 250 2002
KTM EXC 250 2001
KTM EXC 250 2000
KTM EXC 400 2010
KTM EXC 400 2009
KTM EXC 400 2008
KTM EXC 400 2007
KTM EXC 400 2006
KTM EXC 400 2005
KTM EXC 400 2004
KTM EXC 400 2003
KTM EXC 400 2002
KTM EXC 400 2001
KTM EXC 400 2000
KTM EXC 450 2010
KTM EXC 450 2009
KTM EXC 450 2008
KTM EXC 450 2007
KTM EXC 450 2006
KTM EXC 450 2005
KTM EXC 450 2004
KTM EXC 450 2003
KTM EXC 450 2002
KTM EXC 520 2010
KTM EXC 520 2009
KTM EXC 520 2008
KTM EXC 520 2007
KTM EXC 520 2006
KTM EXC 520 2005
KTM EXC 520 2004
KTM EXC 520 2003
KTM EXC 520 2002
KTM EXC 520 2001
KTM EXC 520 2000
KTM EXC 525 2007
KTM EXC 525 2006
KTM EXC 525 2005
KTM EXC 525 2004
KTM EXC 525 2003
KTM EXC 525 2002
KTM EXCF 450 2006
KTM EXCF 450 2005
KTM EXCF 450 2004
KTM EXCF 450 2003
KTM EXCF 450 2002
KTM EXCF 450 2001
KTM EXCF 450 2000
KTM SX 250 2013
KTM SX 250 2012
KTM SX 250 2011
KTM SX 250 2010
KTM SX 250 2009
KTM SX 250 2008
KTM SX 250 2007
KTM SX 250 2006
KTM SX 250 2005
KTM SX 250 2004
KTM SX 250 2003
KTM SX 250 2002
KTM SX 250 2001
KTM SX 250 2000
KTM SX 300 2006
KTM SX 300 2005
KTM SX 300 2004
KTM SX 300 2003
KTM SX 300 2002
KTM SX 300 2001
KTM SX 300 2000
KTM SX 400 2010
KTM SX 400 2009
KTM SX 400 2008
KTM SX 400 2007
KTM SX 400 2006
KTM SX 400 2005
KTM SX 400 2004
KTM SX 400 2003
KTM SX 400 2002
KTM SX 400 2001
KTM SX 400 2000
KTM SX 450 2010
KTM SX 450 2009
KTM SX 450 2008
KTM SX 450 2007
KTM SX 450 2006
KTM SX 450 2005
KTM SX 450 2004
KTM SX 450 2003
KTM SX 450 2002
KTM SX 450 2001
KTM SX 450 2000
KTM SX 520 2010
KTM SX 520 2009
KTM SX 520 2008
KTM SX 520 2007
KTM SX 520 2006
KTM SX 520 2005
KTM SX 520 2004
KTM SX 520 2003
KTM SX 520 2002
KTM SX 520 2001
KTM SX 520 2000
KTM SX 525 2007
KTM SX 525 2006
KTM SX 525 2005
KTM SX 525 2004
KTM SX 525 2003
KTM SX 525 2002
KTM SXS 540 2004