ATHENA Cylinder Head Gasket O-ring Ø105.00 x 2.5 mm for APRILIA MX 125, RX 125 1995-1999

On APRILIA MX 125, RX 125 from 1995 to 1999, the ATHENA M752510500004 head gasket fits in place of the original part. Between the cylinder head and the cylinder, the head gasket contains the pressure of every explosion. Once tightened, it takes the shape of the parts: on reassembly you need a new gasket to keep full compression.

Specifications

• Brand: ATHENA
• Manufacturer part number: M752510500004
• EAN code: 8051757128549
• 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?

Founded in 1973 near Vicenza, Athena is an Italian engine gasket specialist that has made its gaskets on its own production lines since day one, as well as a renowned manufacturer of pistons and cylinder kits. The brand supplies original equipment to manufacturers such as KTM, Ducati, Fantic, Piaggio and Triumph, and is a partner of the MXGP motocross world championship.

Spare parts and items to plan

• Top-end gasket kit : see the selection
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• Spark plug : NGK

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:
APRILIA MX 125 1999
APRILIA MX 125 1998
APRILIA MX 125 1997
APRILIA MX 125 1996
APRILIA MX 125 1995
APRILIA RX 125 1999
APRILIA RX 125 1998
APRILIA RX 125 1997
APRILIA RX 125 1996
APRILIA RX 125 1995