ATHENA Complete Engine Gasket Kit without oil seals for YAMAHA YZ 50 1980-1983

The ATHENA P400485850018 complete engine gasket kit is designed for YAMAHA YZ 50 from 1980 to 1983. When you open up the whole engine, every gasket removed must be replaced. The complete kit brings together the top and bottom end gaskets under one part number: cylinder head, base, crankcases, covers and exhaust, depending on the model.

Specifications

• Brand: ATHENA
• Manufacturer part number: P400485850018
• EAN code: 8050444896501
• Weight: 80 g
• Engine: 2-stroke

When to replace it?

• Oil seeping at the crankcase or cover joints.
• Coolant or oil leak after the engine has been apart.
• Gaskets hardened, torn or stuck to the parts on disassembly.

During a complete engine rebuild (connecting rod, crankshaft bearings, gearbox) or whenever the crankcases are split.

Fitting tips

1. Clean all the gasket faces without scratching them and remove any remains of old gaskets.
2. Fit the gaskets dry, except where the workshop manual specifies sealant.
3. Replace the O-rings at the same time: a crushed O-ring can't be reused.
4. With the cases split, also replace the crankshaft bearings and oil seals and check the gearbox bearings.
5. Tighten the crankcases and covers in a criss-cross pattern to the manufacturer's torque, then fill up with oil and coolant.

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

• Crankshaft bearings and seals : see the selection
• Engine oil seals : see the selection
• Gearbox bearings : see the selection
• 2-stroke oil : LIQUI MOLY 1 L · LIQUI MOLY 4 L
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• Spark plug : see the selection

Frequently asked questions

Are the oil seals included?
No: this kit does not include the engine oil seals; order them separately if needed (engine oil seal kit).

What does the kit contain?
Depends on the model. Compare with your original gaskets if in doubt.

Compatibility

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

Fits:
YAMAHA YZ 50 1983
YAMAHA YZ 50 1982
YAMAHA YZ 50 1981
YAMAHA YZ 50 1980