ATHENA Cylinder Base Gasket for YAMAHA WR 250, YZ 250 1997-2018

The ATHENA cylinder base gasket is designed for YAMAHA WR 250, YZ 250 from 1997 to 2018. The base gasket seals between the cylinder and the crankcase. Its thickness matters: it sets the height of the cylinder, and therefore the squish, the compression and, on a two-stroke, the port timing.

Key features

• Several thicknesses available for the same bike.
• The right tool for setting squish, compression and timing, according to Athena.

Specifications

• Brand: ATHENA
• Manufacturer part numbers: S410485006116, S410485006137, S410485006138, S410485006139, S410485006140, S410485006141
• Available versions: OE: ref. S410485006116; 0.10 mm: ref. S410485006137; 0.20 mm: ref. S410485006138; 0.30 mm: ref. S410485006139; 0.40 mm: ref. S410485006140; 0.50 mm: ref. S410485006141
• Weight: 50 g
• Engine: 2-stroke

Choosing the right thickness

Measure the thickness of the old gasket with a vernier caliper and fit the same, unless you are deliberately adjusting the squish. A thicker gasket increases the squish and lowers compression; a thinner one does the opposite. After any change of thickness, check the squish with solder wire.

When to replace it?

• Oil or coolant seeping at the base of the cylinder.
• Gasket crushed or torn on removal.

Every time the cylinder is removed: a crushed base gasket can't be reused.

Fitting tips

1. Clean the crankcase face and the base of the cylinder without scratching them.
2. Fit the gasket dry, centred on the studs.
3. Tighten the cylinder in a criss-cross pattern to the manufacturer's torque.
4. If you have changed the thickness, measure the squish before refitting the cylinder head with a new head gasket.

Why ATHENA?

Athena, an Italian company founded in 1973 near Vicenza, designs gaskets, pistons and cylinder kits for motorcycles. An OEM supplier to KTM, Ducati, Fantic, Piaggio and Triumph and a partner of the MXGP world championship, it develops its parts on the test bench and on the track with racing teams.

Spare parts and items to plan

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

Frequently asked questions

Which thickness should I choose?
The same as your original gasket, unless you are deliberately adjusting the squish. Thicknesses available: OE, 0.10 mm, 0.20 mm, 0.30 mm, 0.40 mm, 0.50 mm.

Should the other gaskets be replaced?
Yes, as soon as the cylinder is removed: a top end gasket kit includes all the gaskets that need replacing.

Compatibility

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

Fits:
YAMAHA WR 250 2018
YAMAHA WR 250 2017
YAMAHA WR 250 2016
YAMAHA WR 250 2015
YAMAHA WR 250 2014
YAMAHA WR 250 2013
YAMAHA WR 250 2012
YAMAHA WR 250 2011
YAMAHA WR 250 2010
YAMAHA WR 250 2009
YAMAHA WR 250 2008
YAMAHA WR 250 2007
YAMAHA WR 250 2006
YAMAHA WR 250 2005
YAMAHA WR 250 2004
YAMAHA WR 250 2003
YAMAHA WR 250 2002
YAMAHA WR 250 2001
YAMAHA WR 250 2000
YAMAHA WR 250 1999
YAMAHA WR 250 1998
YAMAHA YZ 250 1998
YAMAHA YZ 250 1997