ATHENA Cylinder Head Gasket O-ring Ø124.00 x 3 mm for YAMAHA YZ 125 1982

The ATHENA M753012400004 head gasket is designed for YAMAHA YZ 125 1982. The head gasket seals between the cylinder head and the cylinder: it holds in the combustion pressure and, depending on the engine, the coolant. Crushed when tightened, it can never be reused.

Specifications

• Brand: ATHENA
• Manufacturer part number: M753012400004
• EAN code: 8051757049196
• Material: NBR (nitrile rubber)
• Engine: 2-stroke

When to replace it?

• Loss of compression, less lively engine.
• Black marks or hissing at the head/cylinder joint.
• Coolant level dropping, bubbles in the radiator.

Every time the cylinder head is removed, and therefore at every piston change.

Fitting tips

1. Clean the cylinder head and cylinder faces without scratching them.
2. Seat the O-ring properly in its groove, without twisting or stretching it, so it doesn't get pinched when tightened.
3. No sealant on the gasket.
4. Tighten the cylinder head in a criss-cross pattern, in several stages, to the manufacturer's torque.
5. Refill the coolant and take the opportunity to replace the spark plug.

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 · ATHENA 150
• Piston : ATHENA S4C05800003 · ATHENA S4C04450001
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• Spark plug : NGK 3530 · NGK 3230

Frequently asked questions

How many O-rings do I need?
Depending on the engine, the head has one or two (inner and outer). Compare with your original seals or your manual before ordering.

Compatibility

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

Fits:
YAMAHA YZ 125 1982