ATHENA Complete Engine Gasket Kit without oil seals for YAMAHA YZ 490 1984-1989

ATHENA offers this complete engine gasket kit for YAMAHA YZ 490 1984-1989. A full rebuild means opening the whole engine: cylinder, head, cases and covers. Every gasket removed must be replaced.

Why buy a complete engine gasket kit?

The benefits:

• One part number for the whole engine: cases, covers, cylinder and head.
• Much cheaper than buying the gaskets separately.
• Avoids the bike sitting idle for a forgotten gasket.

Why choose ATHENA?

Athena, original-equipment supplier to KTM and Ducati from Italy, laser-cuts its gaskets from materials designed for heat, oil and coolant.

When should you replace the gaskets on your YAMAHA YZ 490?

An oil or coolant leak, seepage around the cases or a loss of compression signal a tired gasket. Having the kit to hand means the bike is never stuck waiting for one missing gasket.

The manufacturer publishes no hour interval for this model: have the con-rod play checked at every piston change. Cross-Mania guideline: rebuild the bottom end every 2 to 3 top-end rebuilds.

Specifications and fitting tips

• Manufacturer part number: P400485850491

Spare parts and items to plan

• Crankshaft bearings and seals : see the selection
• Engine oil seals : PROX · CENTAURO
• Gearbox bearings : see the selection
• 2-stroke oil : LIQUI MOLY 1 L · MOTUL 1 L
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• Spark plug : NGK

Compatibility

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

Fits:
YAMAHA YZ 490 1989
YAMAHA YZ 490 1988
YAMAHA YZ 490 1987
YAMAHA YZ 490 1986
YAMAHA YZ 490 1985
YAMAHA YZ 490 1984