✓ VERIFIED
Apr 10, 2026
Minor incident
Good gasket for the price, fit fine with easy install.
COMETIC
SKU: 68-9363
Cometic Evo Big Twin Inspection/Derby Cover Gasket 5-Pack - Harley Evolution Big Twin
$8.48
Free shipping on orders $99+ · Best value guarantee
affirm
From $0.70/mo with Affirm.
See if you prequalify
OUT OF STOCK
Free Shipping on orders $99+
Best Value Guarantee
30-Day Returns — see policy
Authorized Dealer — sourced direct
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.
This Cometic inspection/derby cover gasket is engineered specifically for Evo Big Twin engines, providing a direct OEM replacement for your Harley-Davidson. Sold in a convenient 5-pack, it helps prevent oil seepage and maintains the clean look of your V-twin.
Why riders pick this
- Direct OEM replacement for Evo Big Twin
- Includes integrated bolt washer for convenience
- 5-pack quantity for multiple uses or spares
- Prevents oil seepage from primary covers
When you're servicing your Evo Big Twin, a fresh gasket for the inspection or derby cover is crucial for preventing leaks. This Cometic gasket is manufactured to exact OEM specifications, ensuring a perfect seal every time. The included bolt washer simplifies installation, making it a straightforward replacement that keeps your primary looking good and performing reliably, without the unsightly mess of oil seepage.
Reliable Sealing for Evo Primary Covers
- Direct OEM replacement specification for Evo Big Twin engines
- Includes bolt washer for a complete and secure installation
- Five-pack quantity ideal for shops or multiple service intervals
- Designed to prevent oil seepage from inspection and derby covers
Installation Best Practices
Replacing your inspection or derby cover gasket is a routine part of maintaining your Evo Big Twin. It's always recommended to use a new gasket whenever the cover is removed to ensure a proper, leak-free seal. These Cometic gaskets are designed for direct fitment, making the job straightforward. Always consult your Harley-Davidson service manual for torque specifications and installation guidelines to ensure optimal performance and prevent damage.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9363
- Quantity: 5 per pack
- Weight: 4.95 lbs
Common questions
How many gaskets are included in this pack?
This product contains five complete inspection/derby cover gaskets, each with a bolt washer, providing spares or enough for multiple services.
Will this gasket fit Twin Cam or Milwaukee-Eight engines?
No, this gasket is specific to Evolution Big Twin engines. Twin Cam and Milwaukee-Eight models require different gasket part numbers.
Do I need to replace this gasket every time I remove my derby cover?
Yes, Cometic recommends replacing these gaskets whenever the derby or inspection cover is removed to ensure a proper seal and prevent oil leaks.
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 | 68-9363 |
| WEIGHT | 4.95 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.78
18 RATINGS
5★
15
4★
2
3★
1
2★
0
1★
0
✓ VERIFIED
May 24, 2024
It works
Good gasket . Probably could have reused mine , but replaced it for peace of mind .
✓ VERIFIED
Mar 30, 2022
Looks just like the HD gasket, good price
✓ VERIFIED
Aug 12, 2020
you'd think that a trans rebuild kit would have had one of these in it. oh well
✓ VERIFIED
Jun 17, 2020
everything I expected
✓ VERIFIED
Apr 28, 2020
It sealed the inspection cover!
