What specific Harley-Davidson models does this kit fit?

This Cometic gasket kit is designed for Harley-Davidson motorcycles manufactured between 1984 and 1991. It is specifically intended for use with 3 3/4 inch big bore engine setups.

What does a 'top end rebuild kit' typically include?

A top end rebuild kit usually contains the gaskets needed to reseal the cylinder heads to the cylinders and the cylinders to the crankcase. This ensures proper compression and prevents leaks after engine work.

Why is a specific gasket kit needed for a 'big bore' setup?

Big bore kits increase the diameter of the cylinders, which changes the sealing surface dimensions. A specialized kit like this one ensures the gaskets precisely match the larger bore size for a secure and leak-free seal.

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Trusted Since 1957

Est. 1957

Specifications

Brand: Cometic Gasket
Part #: C9771
UPC: 191070065201

Cometic Harley-Davidson 84-91 3 3/4in Big Bore Top End Rebuild Kit

Name: Cometic Harley-Davidson 84-91 3 3/4in Big Bore Top End Rebuild Kit
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-harley-davidson-84-91-3-3-4in-big-bore-top-end-rebuild-ki-t14-691726
Price: 149.43 USD
Availability: BackOrder

$149.43

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Cometic Harley-Davidson 84-91 3 3/4in Big Bore Top End Rebuild Kit.

Key Features

Top end rebuild kit for 1984-1991 Harley-Davidson motorcycles.
Designed for 3 3/4 inch big bore engine configurations.
Includes essential gaskets for top end engine assembly.
Cometic Gasket is a well-known name in engine sealing components.

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About this part

Product Details

If you're rebuilding the top end of your 1984-1991 Harley-Davidson and going with a 3 3/4 inch big bore setup, this gasket kit from Cometic is what you'll need to seal everything up right. This kit contains all the essential gaskets to get your engine back together after a major overhaul or upgrade.

Cometic is known for making well-built gaskets, and this kit is no different. It's put together with the specific dimensions needed for that 3 3/4 inch bore size, ensuring a proper seal between your cylinders and heads. Having the right gaskets is crucial for proper compression and to prevent oil or combustion leaks, which can cause serious engine damage.

This kit is designed to be a direct replacement for the stock gaskets when you're performing a big bore modification. Make sure you have all the necessary components for your rebuild before you start.