Gaskets and Seals› Engine Gaskets and Seals

Cometic Gasket

Cometic One Piece Rocker Base All EVO Harley-Davidson 020inRc 10 Pack

$102.15

SKU: C006 C9866

In Stock
In Stock
Ships by Jul 30
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Cometic C9866 is a rocker base gasket designed for Harley-Davidson Evolution Big Twin and Sportster engines. This gasket features Viton material for fuel resistance and a thickness of .020 inches, with a rubber coating over a stainless steel core. It is made in the U.S.A. and comes in a pack of 10.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandCometic Gasket
Part NumberC006 C9866

Videos

How-To: Leaky Rocker Box Gasket Fix on Harley-Davidson Sportster

How-To: Leaky Rocker Box Gasket Fix on Harley-Davidson Sportster
Cometic Gaskets presented by J&P Cycles.

Cometic Gaskets presented by J&P Cycles.
Back to Basics: Evo Sportster Rocker Box Gasket Service

Back to Basics: Evo Sportster Rocker Box Gasket Service
Harley Davidson Exhaust Gasket! How to install.

Harley Davidson Exhaust Gasket! How to install.
Review and Install of the Cometic Gasket for The Harley Primary Cover.

Review and Install of the Cometic Gasket for The Harley Primary Cover.
Harley Davidson Rocker Box Gaskets Replacement Made EASY

Harley Davidson Rocker Box Gaskets Replacement Made EASY
How to Seal Harley Davidson Gaskets and Seals

How to Seal Harley Davidson Gaskets and Seals
HOW TO CHOOSE A HEAD GASKET FOR A HARLEY EVO EVOLUTION MOTOR ENGINE - GASKETS IN STOCK

HOW TO CHOOSE A HEAD GASKET FOR A HARLEY EVO EVOLUTION MOTOR ENGINE - GASKETS IN STOCK
TC88 Series: 21 How to install Harley rocker boxes & gaskets. BONUS: How to bleed down lifters

TC88 Series: 21 How to install Harley rocker boxes & gaskets. BONUS: How to bleed down lifters

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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