Athena, cylinder head and base gasket. Copper

Includes cylinder head and base gaskets to service one motorcycle.
With a .040" copper head gasket (94mm diameter) and a .012" 'A' style (late style) aluminium base gasket (100mm diameter).
OEM replacement reference: base gaskets 16774-84A and head gaskets 16773-85 and 16770-84D.
Explanation of 'type A' (early style) and 'type B' (late style) gaskets: There are 2 types of cylinder base gaskets available for Evolution models. For convenience, we will call them 'type A' (early) and 'type B' (late). The 'type A' gasket was introduced on the 1984 Evolution Big Twin models and can be used on all 84-99 Evo 1340cc models, fitting the contours of the cylinder base perfectly. They fit 86-22 Evo XL models, but protrude at the cylinder base. This can be a problem with silicone-beaded base gaskets. The 'type B' gasket was introduced on the Evolution XL Sportster models in 1986 and fits all Evo XL models as well as all 84-99 Evo 1340cc models, although the Big Twin cylinder base is slightly larger than the gasket. 'Type B' is the only type of gasket 'The Factory' has supplied since 1986 onwards for both Evo Big Twin and Evo XL Sportster models. Both 'type A' and 'type B' have identical inner diameter, oil hole and bolt hole location. The gaskets for the front and rear cylinders are identical. The only difference between 'A' and 'B' gaskets is the outer perimeter.


Specifications


Brand
Athena


Application
84-99 Evo Big Twin (NU)


OEM
16774-84A, 16773-85, 16770-84D


Material
Copper


Packaging weight
0.129 kg


HS Code
84849000


Motorcycle family
BIG TWIN, DYNA, FX, FXR, SOFTAIL, TOURING


Original name
Athena, cylinder head & base gasket kit. Copper