✓ 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 Evo Big Twin EST Gasket Kit - Bore EVO BIG Twin KIT — Harley-Davidson (1984-1999)
$140.45
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Cometic Evo Big Twin EST gasket kit contains all gaskets, seals, washers, and o-rings needed for a complete engine overhaul on Evo Big Twin engines. Includes MLS head gaskets, steel Viton-coated base gaskets, blue Viton valve stem seals, and AFM material for durability and reliable sealing.
Features
- MLS head gaskets
- Steel Viton-coated base gaskets
- Blue Viton valve stem seals
- AFM material components
- Complete overhaul kit — all gaskets and seals included
Specifications
- Brand: Cometic
- Manufacturer Part #: C9917
- Weight: 0.86 lbs
Fitment
Fits Harley-Davidson Evo Big Twin engines.
Frequently Asked Questions
What's included in this gasket kit?
All gaskets, seals, washers, and o-rings needed for a complete engine overhaul — head gaskets, base gaskets, valve stem seals, and additional components.
Will this work on other V-Twin engines?
This kit is designed for Harley-Davidson Evo Big Twin engines. Other V-Twin applications may require a different Cometic part number.
What's the difference between MLS and standard gaskets?
MLS (multi-layer steel) head gaskets provide superior sealing and heat resistance compared to older single-layer designs, especially in high-performance applications.
Do I need any additional gaskets or seals?
No — this complete kit includes every gasket, seal, washer, and o-ring needed for a full engine overhaul.
| 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?
