ATHENA Cylinder Base Gasket for GAS GAS EC 200, EC 250, EC 300, MX 250, MX 300 1997-2014

ATHENA offers this cylinder base gasket for GAS GAS EC 200, EC 250, EC 300, MX 250, MX 300 1997-2014. 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 GAS GAS EC 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

• Manufacturer part numbers: S410155006004 (0.10 mm), S410155006005 (0.30 mm), S410155006006 (0.50 mm)

Choose the thickness from the list. "OE" is the factory thickness; another thickness is used to set the cylinder height after a rebuild (piston-to-head clearance, port timing on a 2-stroke).

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 : VHM · ATHENA
• Piston : PROX · WISECO
• Piston rings : PROX · WISECO
• Coolant : LIQUI MOLY 1 L · TWIN AIR

Compatibility

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

Fits:
GAS GAS EC 200 2011
GAS GAS EC 200 2010
GAS GAS EC 200 2009
GAS GAS EC 200 2008
GAS GAS EC 200 2007
GAS GAS EC 200 2006
GAS GAS EC 200 2005
GAS GAS EC 200 2004
GAS GAS EC 200 2003
GAS GAS EC 200 2002
GAS GAS EC 200 2001
GAS GAS EC 200 2000
GAS GAS EC 200 1999
GAS GAS EC 200 1998
GAS GAS EC 200 1997
GAS GAS EC 250 2014
GAS GAS EC 250 2013
GAS GAS EC 250 2012
GAS GAS EC 250 2011
GAS GAS EC 250 2010
GAS GAS EC 250 2009
GAS GAS EC 250 2008
GAS GAS EC 250 2007
GAS GAS EC 250 2006
GAS GAS EC 250 2005
GAS GAS EC 250 2004
GAS GAS EC 250 2003
GAS GAS EC 250 2002
GAS GAS EC 250 2001
GAS GAS EC 250 2000
GAS GAS EC 250 1999
GAS GAS EC 250 1998
GAS GAS EC 250 1997
GAS GAS EC 300 2014
GAS GAS EC 300 2013
GAS GAS EC 300 2012
GAS GAS EC 300 2011
GAS GAS EC 300 2010
GAS GAS EC 300 2009
GAS GAS EC 300 2008
GAS GAS EC 300 2007
GAS GAS EC 300 2006
GAS GAS EC 300 2005
GAS GAS EC 300 2004
GAS GAS EC 300 2003
GAS GAS EC 300 2002
GAS GAS EC 300 2001
GAS GAS EC 300 2000
GAS GAS EC 300 1999
GAS GAS EC 300 1998
GAS GAS EC 300 1997
GAS GAS MX 250 2013
GAS GAS MX 250 2012
GAS GAS MX 250 2011
GAS GAS MX 250 2007
GAS GAS MX 250 2006
GAS GAS MX 250 2005
GAS GAS MX 250 2004
GAS GAS MX 250 2003
GAS GAS MX 250 2002
GAS GAS MX 250 2001
GAS GAS MX 300 2013
GAS GAS MX 300 2012
GAS GAS MX 300 2011
GAS GAS MX 300 2010
GAS GAS MX 300 2009
GAS GAS MX 300 2008
GAS GAS MX 300 2007
GAS GAS MX 300 2006
GAS GAS MX 300 2005
GAS GAS MX 300 2004
GAS GAS MX 300 2003
GAS GAS MX 300 2002
GAS GAS MX 300 2001
GAS GAS MX 300 2000
GAS GAS MX 300 1999
GAS GAS MX 300 1998
GAS GAS MX 300 1997