✓ VERIFIED
Apr 1, 2024
keeps them lookin shiny
keeps the oil on the right side
COMETIC
SKU: 68-9305F1
Cometic Evo Big Twin Inspection/Derby Cover Gasket 1-Pack - Harley Touring & Dyna
$10.66
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About Cometic
Cometic Gasket manufactures multi-layer steel head gaskets and complete gasket kits in Concord, Ohio. On a built V-twin running higher compression or a big-bore kit, the MLS head gasket is what keeps the top end sealed — which is why Cometic is the default spec on so many engine builds.
Maintain a leak-free primary on your Evo Big Twin with this Cometic inspection and derby cover gasket. This direct OEM replacement is engineered to provide a secure seal, preventing oil leaks and resisting engine vibration.
Why riders pick this
- Direct OEM replacement for Harley part #34906-85a
- Designed for Evo Big Twin engines
- Seals inspection and derby covers securely
- Resists oil leaks and engine vibration
- Single gasket for individual service
A leaking derby cover is more than just an eyesore; it can indicate underlying issues or lead to oil loss. This Cometic gasket is a precision-engineered replacement for the factory Harley part, specifically designed for Evo Big Twin engines. It ensures a tight, reliable seal every time you access your primary.
Secure Sealing for Evo Big Twins
- Direct OEM replacement for Harley part #34906-85a
- Engineered to prevent oil leaks and resist vibration
- Ensures proper sealing of the inspection and derby cover
- Single gasket per pack for individual service needs
Essential for Primary Maintenance
Whether you're changing fluids or inspecting your primary, a fresh derby cover gasket is crucial for proper reassembly. This Cometic gasket provides the confidence of a secure seal, allowing you to focus on the ride. While these gaskets are durable, replacing them during primary service is best practice for long-term reliability.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9305F1
- Weight: 0.2606 lbs
Common questions
Will this gasket fit my Evo Big Twin engine?
Yes, this Cometic gasket is a direct replacement for Harley OEM part #34906-85a, which is used on Evo Big Twin engines.
Is this a one-time-use gasket, or can it be reused?
Cometic gaskets are designed for durability and can often be reused if the mating surfaces are clean and undamaged. However, for optimal sealing and peace of mind, replacing the gasket during primary service is recommended.
Do I need to use sealant with this gasket?
No, Cometic gaskets are designed to seal through compression alone. A small dab of assembly lube on bolt threads can prevent seizing, but RTV sealant is not necessary for the gasket itself.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Cometic |
| TYPE | Gaskets/Seals |
| SKU | 68-9305F1 |
| WEIGHT | 0.26 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.71
14 RATINGS
5★
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✓ VERIFIED
Dec 4, 2023
Easy to install. Good quality and price. Does what it is supposed to do
✓ VERIFIED
Apr 9, 2019
Very good quality/value for the price, I would buy them again.
✓ VERIFIED
May 1, 2016
Good gasket, I like these because they are the same thickness as factory, and do not change the end play on the cam and breather
✓ VERIFIED
Apr 29, 2015
Decent gasket. Sticks out of the nosecone cover a bit at the top as it doesn't follow the nose cone shape precisely. Seals well.
✓ VERIFIED
Jun 22, 2014
easy to replace just like oem
