✓ VERIFIED
May 16, 2026
not what I needed. description wasn't very clear but not worth sending back. oh well just have to be more careful next time
COMETIC
SKU: 68-9917
Cometic EST Gasket Kit - Evo Big Twin - Harley Evolution Big Twin
$436.000,00
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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.
When it's time for a full engine overhaul on your Evo Big Twin, the Cometic EST Gasket Kit provides everything you need for a complete and reliable seal. This comprehensive kit includes all gaskets, seals, washers, and o-rings necessary to refresh your Evolution engine. It's designed to bring your V-twin back to peak sealing performance.
Why riders pick this
- Complete engine overhaul kit for Evo Big Twin
- Includes MLS head gaskets for superior sealing
- Features steel Viton-coated base gaskets
- Blue Viton valve stem seals for reliability
- All necessary gaskets, seals, washers, and o-rings
This Cometic Evo Big Twin EST gasket kit is the ultimate solution for a complete engine overhaul on your Harley-Davidson Evolution Big Twin. It's a comprehensive package, containing all the gaskets, seals, washers, and o-rings required to rebuild your engine from the ground up. This eliminates the hassle of sourcing individual components, ensuring you have every piece needed for a professional-grade rebuild. The kit features advanced sealing materials, including MLS head gaskets, steel Viton-coated base gaskets, and durable AFM material components, all designed for superior sealing and longevity.
Comprehensive Engine Sealing
- Complete kit for a full engine overhaul of Evo Big Twin engines
- Includes Multi-Layer Steel (MLS) head gaskets for superior sealing
- Features steel Viton-coated base gaskets for enhanced durability
- Blue Viton valve stem seals ensure optimal valve train performance
- Constructed with advanced AFM material for reliable, long-lasting seals
The Right Kit for Your Evolution
Undertaking an engine overhaul is a significant project, and having a complete, high-quality gasket kit is paramount. The Cometic Evo Big Twin EST kit simplifies the process by providing all the necessary sealing components in one package, engineered to meet the demands of your Evolution engine. This ensures that every mating surface is properly sealed, contributing to optimal compression, oil retention, and overall engine health. Trust Cometic to provide the foundation for a powerful and leak-free Evo Big Twin.
Specifications
- Brand: Cometic
- Manufacturer Part #: C9917
- Weight: 0.86 lbs
Common questions
What's included in this Cometic gasket kit?
This complete kit includes all gaskets, seals, washers, and o-rings needed for a full engine overhaul on Evo Big Twin engines, such as MLS head gaskets, steel Viton-coated base gaskets, and valve stem seals.
Will this kit work on Twin Cam or Milwaukee-Eight engines?
No, this kit is specifically designed for Harley-Davidson Evolution Big Twin engines. Twin Cam and Milwaukee-Eight (M8) engines require different gasket kits. Please use our Shop by Bike tool to find the correct kit for your model.
What are MLS head gaskets?
MLS stands for Multi-Layer Steel. These head gaskets are constructed from multiple layers of embossed steel, offering superior sealing and durability compared to traditional composite gaskets, especially in high-performance applications.
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 | 68-9917 |
| WEIGHT | 0.86 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.36
14 RATINGS
5★
11
4★
0
3★
1
2★
1
1★
1
✓ VERIFIED
Mar 8, 2026
Gasket
Working fine was for my brother's bike
✓ VERIFIED
Oct 25, 2024
Works Fine at a lower cost
I usually have an OEM from Harley Davidson, I have used this twice on my 04 Electraglide, no leaks or issues. At a much lower price.
✓ VERIFIED
Jun 8, 2024
A mediocre gasket
I didn’t use this gasket after removing the derby and seeing the Harley gasket that I removed. No comparison in quality. I ended up going to the local dealer and bought an O.E. gasket.
✓ VERIFIED
Jun 6, 2023
A good buy
The gasket fit nicely and no leaks so far . The fitment was spot on .
✓ VERIFIED
May 4, 2023
There is nothing on them indicating they are actually Cometic gaskets. Are they Substitutes?
