✓ VERIFIED
Jan 16, 2020
Almost identical to OEM. Good fit. I did miss that they are sold as each and not as a pair. Small detail and my fault but it did slow my project down a bit.
COMETIC
SKU: 68-9379
Cometic Evo Big Twin Starter Shaft Oil Seal 5-Pack - Harley Evolution Big Twin
$24.54
Free shipping on orders $99+ · Best value guarantee
affirm
From $2.04/mo with Affirm.
See if you prequalify
IN STOCK
— Ships within 24 hours
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 Evo Big Twin starter shaft seal is an OEM-specification oil seal designed to prevent leakage at the motor shaft starter junction. Offered in a 5-pack, it's ideal for shops or multi-bike owners maintaining Evolution Big Twin engines.
Why riders pick this
- OEM-specification starter shaft oil seal
- Engineered for Evolution Big Twin engines
- 5-pack for convenience and stocking spares
- Prevents oil leakage at the motor shaft junction
A leaking starter shaft seal can lead to unsightly oil weeping and potential issues on your Evo Big Twin. This Cometic oil seal is engineered to meet or exceed OEM specifications, providing a precise fit and reliable sealing performance. By replacing a worn or damaged seal with this high-quality component, you ensure that oil stays where it belongs, keeping your engine clean and operating efficiently.
Critical Sealing for Evo Big Twin Starters
- OEM-specification oil seal for the starter shaft
- Designed specifically for Evolution Big Twin V-twin engines
- 5-pack quantity for shops, multiple projects, or convenient spares
- Prevents oil leakage at the motor shaft starter junction
Maintaining a Leak-Free Evo Engine
Addressing oil leaks promptly is vital for the long-term health of your Evo Big Twin. This Cometic starter shaft seal is a direct replacement, simplifying the repair process. Always refer to your Harley-Davidson service manual for specific installation instructions and torque values to ensure a correct and durable seal. Proper installation of this seal will help maintain a leak-free engine compartment and preserve the integrity of your V-twin.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9379
- Quantity: 5 per pack
- Weight: 0.07 lbs per unit
Common questions
What is the function of this seal?
This seal prevents oil leakage where the starter shaft enters the motor on an Evo Big Twin engine. A worn seal can cause noticeable oil weeping around the starter area.
Why is this seal sold in a 5-pack?
The five-unit pack is ideal for professional shops, fleet maintenance, or individual riders who are rebuilding multiple engines or prefer to keep spares on hand for future service.
Will this seal fit Twin Cam or Milwaukee-Eight engines?
No, this seal is specific to Evolution Big Twin engines. Twin Cam and Milwaukee-Eight models use different starter shaft seal designs and part numbers.
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 | 68-9379 |
| WEIGHT | 0.07 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.87
15 RATINGS
5★
13
4★
2
3★
0
2★
0
1★
0
✓ VERIFIED
Oct 18, 2021
Great seals and gaskets do the job once when you use quality gaskets
✓ VERIFIED
Sep 26, 2019
Seal good and I haven't had any issues..
✓ VERIFIED
Jun 27, 2025
It worked like it was suppose to, delivery was quick. <br />Pleased.
✓ VERIFIED
Dec 19, 2023
Just what I needed
Needed these when changing out intake manifold. They worked perfect for my ‘03 sporty.
✓ VERIFIED
Jun 12, 2023
Cometic from here on out
These seals are the only ones I'll use. others came close but, for me, these are best.
