✓ VERIFIED
Apr 1, 2024
keeps them lookin shiny
keeps the oil on the right side
COMETIC
SKU: 68-9166
Cometic Valve Stem Seals 10-Pack - Harley Evo Big Twin & Twin Cam
$40.18
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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.
These Cometic valve stem seals are essential for maintaining engine health in your Harley-Davidson Evo Big Twin or Twin Cam. Supplied in a convenient 10-pack, they are a direct replacement for your stock seals. Replacing worn valve stem seals is crucial to prevent oil seepage past the valves and into the combustion chamber, ensuring cleaner operation and optimal performance.
Why riders pick this
- 10-pack for comprehensive valve stem replacement
- Direct OEM replacement for easy installation
- Fits Evo Big Twin and Twin Cam engines
- Prevents oil seepage for cleaner combustion
- Durable construction for long-lasting performance
Over time, original valve stem seals can harden, crack, and lose their effectiveness, leading to undesirable oil consumption and smoke. This 10-pack of Cometic valve stem seals provides a high-quality solution for refreshing your engine's top end. Designed to meet or exceed OEM specifications, these seals ensure a tight fit and durable performance, keeping oil where it belongs and out of your exhaust.
Reliable Sealing for Your V-Twin
- Supplied in a 10-pack, ideal for a full engine service or multiple replacements
- Engineered as a direct OEM replacement for a seamless fit and function
- Specifically designed for Harley-Davidson Evo Big Twin and Twin Cam V-twin engines
- Helps prevent oil seepage past the valve stems, reducing smoke and oil consumption
- Constructed from durable materials for long-lasting performance and reliability
Maintain Peak Engine Performance
Addressing worn valve stem seals is a key part of maintaining your V-twin's performance and longevity. Whether you're doing a top-end refresh or a full engine rebuild, these Cometic seals are a critical component. They ensure proper valve lubrication without allowing excess oil into the combustion process, contributing to a cleaner burn and more consistent power delivery. Confirm your engine type to ensure perfect fitment.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9166
- Weight: 0.15 lbs
- Quantity: 10 per pack
Common questions
How many valve stem seals are included in this pack?
This Cometic product comes as a 10-pack of valve stem seals, providing enough for most engine applications with spares or for multiple service intervals.
What Harley-Davidson engines do these seals fit?
These valve stem seals are designed to fit both Evolution Big Twin and Twin Cam V-twin engines. Please confirm your engine type before ordering.
Why is it important to replace valve stem seals?
Valve stem seals wear out over time, leading to oil seeping past the valve guides into the combustion chamber. Replacing them helps prevent excessive oil consumption, exhaust smoke, and maintains engine efficiency.
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 | 68-9166 |
| WEIGHT | 0.15 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
