COMETIC SKU: 68-9150

Cometic Primary Housing Gasket & Seal Kit - Harley Evolution & Twin Cam

$120.35
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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.

The Cometic Primary Housing Gasket and Seal Kit provides a robust solution for sealing the primary cover on your Evolution Big Twin or Twin Cam engine. This kit uses modern gasket materials and precision engineering to prevent leaks and maintain performance. It's an essential component for any primary service or rebuild.

Why riders pick this

  • Precision-engineered for a tight, leak-free primary seal
  • Modern gasket materials for enhanced durability
  • Designed for Evolution Big Twin and Twin Cam engines
  • Essential for primary cover maintenance or rebuilds

When you're wrenching on your Harley, a reliable primary seal is critical. The Cometic Primary Housing Gasket and Seal Kit is engineered to meet the demands of performance V-twin engines, ensuring a leak-free primary cover. This kit includes all necessary gaskets and seals to get the job done right, whether you're performing routine maintenance or a full engine overhaul.

Engineered for a Superior Seal

  • Designed with precision tolerances for a perfect fit
  • Utilizes advanced gasket materials for enhanced durability and sealing
  • Withstands the rigors of high-performance engine operation
  • Direct replacement for your worn or leaking factory primary gaskets

Reliable Sealing for Your V-Twin

This Cometic kit is built for the long haul, providing peace of mind that your primary is sealed against leaks. It's a smart upgrade for any Evolution Big Twin or Twin Cam owner looking for improved reliability during maintenance or performance builds. Ensure a clean, secure seal every time you service your primary with Cometic's proven gasket technology.

Specifications

  • Brand: Cometic
  • Manufacturer Part #: C9150
  • UPC: 191070019334
  • Length: 22.7 in
  • Width: 13.2 in
  • Height: 1.9 in
  • Weight: 1.05 lbs

Common questions

Will this kit fit my Evolution Big Twin engine?

Yes, this Cometic kit is specifically designed for Evolution Big Twin primary housings, ensuring a precise fit and reliable seal.

Is this compatible with Twin Cam engines as well?

Absolutely, this gasket and seal kit covers both Evolution Big Twin and Twin Cam engine platforms, providing versatile fitment.

What components are included in this primary gasket kit?

This kit includes the primary housing gasket and all necessary seals required to effectively reseal the primary cover assembly on your V-twin.

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.
BRANDCometic
TYPEGaskets/Seals
SKU68-9150
WEIGHT1.05 lb
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.73
11 RATINGS
5★ 8
4★ 3
3★ 0
2★ 0
1★ 0
✓ VERIFIED
Oct 4, 2025

Rocker gaskets

Great qualities to these gaskets. Have used them extensively!

— THOMAS B
✓ VERIFIED
Sep 29, 2025

Cometic gaskets

I used james gaskets before i got cometic and they didn’t last long and had to pay someone to replace them again so I went with cometic and so far so good im going to stick with this brand from now on

— Shane P
✓ VERIFIED
Mar 18, 2024

Magical

This gasket worked perfectly! ALTHOUGH, it would not have been needed had the James Engine gasket set had the correct gasket. The bolt holes were large on the set(I suppose fore different engine applications) which introduced an oil leak issue after I rebuilt my engine. <br />The COMETIC GASKET fit my 103 perfectly and ...tada!..magically...no leaks!

— Arthur v
✓ VERIFIED
Jul 7, 2019

Fits, works, looks like good material. Would use again if needed.

— Anonymous
✓ VERIFIED
Apr 18, 2016

Great product. No extra material necessary and no leaks after using.

— Anonymous
✓ VERIFIED
Oct 31, 2015

Great gaskets worked perfect. Prefer James gaskets but they were not available. Theses got the job done.

— Anonymous