Athena, cylinder base gasket. FR/RR .020"

Hole from 3" to 3-1/2".
Front/rear. 0.5mm (.020") reinforced fibre.
Type 'B'.
Standard thickness.
This gasket is made with MotorGasket M0109, a material developed and produced by Athena. MotorGasket M0109 is a high-quality asbestos-free gasket material, composed of a blend of mineral fibres, aramid fibres and NBR rubber. It offers excellent sealing capabilities with gases and fluids, along with adaptability characteristics, making it suitable for use under moderate pressures.
OEM replacement reference 16774-86A.
Note: Explanation of Evolution 'A' and 'B' type cylinder base gaskets.
There are 2 types of cylinder base gaskets available for Evolution models. For convenience, we call them 'type A' (early style) and 'type B' (late style).
- 'Type A' gasket: Introduced on the 1984 Evolution Big Twin models, and can be used on all 84-99 Evo 1340cc models, fitting the cylinder base contours perfectly. Fits 86-22 Evo XL, 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 gasket type that 'The Factory' supplied from 1986 onwards for the Evo Big Twin and Evo XL Sportster models.
Both the 'A' and 'B' type gaskets have an identical inner diameter, oil hole location and bolt holes. 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; 86-22 XL Sportster (Excl. 08-12 XR1200) (NU)


OEM
16774-86A


Sales unit
Pack of 10 pcs


Material
Fiberglass


Packaging weight
0.056 kg


HS Code
84849000


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


Original name
Athena, cylinder base gasket. FR/RR .020"