Athena, cylinder base gasket. FR/RR .015" RCS

3-1/2" hole. Front/rear.
Type 'A'.
0.4mm (.015)" RCS (Rubber-coated steel).
Gasket with stamped steel core and heat-resistant nitrite rubber coating 0.001" thick on both sides.
OEM replacement reference 16774-86C, 16774-86D, 16789-04.
Note: Explanation of 'A' and 'B' type cylinder base gaskets for Evolution.
There are 2 types of cylinder base gaskets for Evolution models. For convenience, we call them 'type A' (old style) and 'type B' (recent style).
- 'Type A' gasket: Introduced on the 1984 Evolution Big Twin models and can be used on all 84-99 1340cc Evo models, fitting the cylinder base contours perfectly. Fits 86-22 Evo XLs, but protrudes at the cylinder base. This can be an issue with silicone-beaded base gaskets.
- 'Type B' gasket: Introduced on 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.
The 'type B' is the only type of gasket 'The Factory' supplied from 1986 for both Evo Big Twin and Evo XL Sportster models.
Both the 'A' and 'B' type gaskets have an identical inner diameter, oil hole and bolt hole location. The gaskets for the front and rear cylinder are identical. The only difference between the 'A' and 'B' gaskets is the outer perimeter.


Specifications


Brand
Athena


Application
84-99 Evo Big Twin (NU)


OEM
16774-86C, 16774-86D, 16789-04


Sales unit
Pack of 5 pcs


Packaging weight
0.074 kg


HS Code
84849000


Original name
Athena, cylinder base gasket. FR/RR .015" RCS