✓ 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: 68-9851
Cometic Evo Big Twin EST Gasket Kit - Oe#17033-83-A — Harley-Davidson Electra Glide Classic, Softail Custom, Softail Heritage Classic (1984-1999)
$140.45
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Cometic Evo Big Twin EST gasket kit supplies every gasket, seal, washer, and o-ring needed for a complete engine overhaul on compatible V-twin motorcycles. The kit includes MLS head gaskets, steel Viton-coated base gaskets, blue Viton valve stem seals, and AFM material components.
Features
- MLS head gaskets
- Steel Viton-coated base gaskets
- Blue Viton valve stem seals
- AFM material components
- Complete overhaul kit — all gaskets, seals, washers, and o-rings included
Specifications
- Brand: Cometic
- Manufacturer Part #: C9851
- Length: 9 in
- Width: 7.5 in
- Height: 2.1 in
- Weight: 0.755 lbs
Fitment
Fits Evo Big Twin EST engines. Verify your engine code matches OE# 17033-83-A before ordering.
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 AFM material.
Will this fit my Harley Evo Big Twin?
This kit is designed for Evo Big Twin EST engines matching OE# 17033-83-A. Confirm your engine code with your VIN before purchasing.
Do I need any other gaskets or seals?
This is a complete overhaul kit — it includes every gasket, seal, washer, and o-ring needed. No additional gaskets required.
What material are the head gaskets?
MLS (multi-layer steel) construction for durability and reliability.
| BRAND | Cometic |
| TYPE | Gaskets/Seals |
| SKU | 68-9851 |
| WEIGHT | 0.75 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?
