✓ 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: 68-9983F
Cometic Evo Big Twin Transmission Gasket - EVO/TC 10/PK Oe#34904-86b — Harley-Davidson (1984-2026)
$31.40
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Cometic Evo Big Twin transmission gasket engineered for V-twin motorcycle transmissions, sold in a 10-pack for shops or riders maintaining multiple bikes. OEM replacement spec built to handle modern high-performance engine demands.
Features
- 10-pack quantity
- OEM-equivalent design
- Direct replacement for V-twin transmissions
Specifications
- Brand: Cometic
- Manufacturer Part #: C9983F
- UPC: 191070034849
- Length: 7.05 in
- Width: 6 in
- Height: 0.6 in
- Weight: 0.05 lbs
Fitment
Fits V-twin motorcycle transmissions, including Evo Big Twin and Twin Cam applications.
Frequently Asked Questions
Is this an OEM Harley gasket or an aftermarket equivalent?
Cometic manufactures this to OEM specifications as a direct replacement gasket for V-twin transmissions.
Why buy a 10-pack?
The 10-pack is intended for shops, multi-bike fleets, or riders who keep spares on hand for future service.
Will this fit Twin Cam and Evo engines?
Yes — this gasket fits both Evo Big Twin and Twin Cam transmission housings.
| BRAND | Cometic |
| TYPE | Gaskets/Seals |
| SKU | 68-9983F |
| WEIGHT | 0.05 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?
