Your cart is empty
Start ShoppingCOMETIC C7757 High Performance Top End Gasket Kit - Durable Gaskets for Power Sports Engines
Fits your
May not fit your
Description
Upgrade your engine's sealing system with the COMETIC C7757 High Performance Top End Gasket Kit, engineered for power sports engines requiring maximum durability and leak-proof performance. This premium kit delivers reliable sealing under extreme conditions, ensuring peak engine efficiency and longevity for riders who demand top-tier performance.
Key Features
- High-Temperature Resistance: Advanced material composition withstands extreme heat without warping or degradation, maintaining seal integrity in high-performance environments.
- Precision Engineering: CNC-machined components ensure perfect fitment and even pressure distribution, reducing the risk of compression leaks and engine damage.
- Multi-Layer Construction: Reinforced composite design provides superior sealing for combustion chambers, oil passages, and coolant systems, preventing costly downtime.
Why Choose This Product
Whether you're modifying a high-horsepower engine or maintaining a stock setup, the COMETIC C7757 offers unmatched reliability. Its durable construction minimizes maintenance intervals, while precise tolerances ensure optimal engine performance. Trusted by professionals and enthusiasts alike, this gasket kit delivers peace of mind for riders who push their machines to the limit.
Delivery
Checking availability...
Estimated arrival
Order within to ship today
Orders ship
Shipping to
Enter your ZIP code for delivery estimate
Price Match Guarantee
Found it cheaper?
Log in to submit a price match request.
Price
Quantity
Free Shipping $100+
14-Day Returns
Secure Checkout
Price Match
Complete the Build
This item
$46.95
In Cart
Upgrade your engine's sealing system with the COMETIC C7757 High Performance Top End Gasket Kit, engineered for power sports engines requiring maximum durability and leak-proof performance. This premium kit delivers reliable sealing under extreme conditions, ensuring peak engine efficiency and longevity for riders who demand top-tier performance.
Key Features
- High-Temperature Resistance: Advanced material composition withstands extreme heat without warping or degradation, maintaining seal integrity in high-performance environments.
- Precision Engineering: CNC-machined components ensure perfect fitment and even pressure distribution, reducing the risk of compression leaks and engine damage.
- Multi-Layer Construction: Reinforced composite design provides superior sealing for combustion chambers, oil passages, and coolant systems, preventing costly downtime.
Why Choose This Product
Whether you're modifying a high-horsepower engine or maintaining a stock setup, the COMETIC C7757 offers unmatched reliability. Its durable construction minimizes maintenance intervals, while precise tolerances ensure optimal engine performance. Trusted by professionals and enthusiasts alike, this gasket kit delivers peace of mind for riders who push their machines to the limit.| SKU | GM4B169410 |
|---|---|
| MPN | C7757 |
| UPC/GTIN | 191070012946 |
| Brand | Cometic |
| Category | Gaskets/Seals |
0.0
0 reviews
0
Log in to write a review.
Reviews
No reviews yet. Be the first to review this product!
Featured Review
| Make | Model | Years |
|---|---|---|
| Honda | CRF450R | 2019-2025 |
| Honda | CRF450RX | 2019-2025 |
| Honda | CRF450RL | 2021-2025 |
Frequently Asked Questions
Most Cometic head and base gaskets are designed to be installed dry unless the instructions or the OEM service manual specify otherwise. Overuse of RTV or sealant can cause leaks or block passages. Always follow Cometic’s printed instructions and the vehicle’s service manual.
Cometic top end kits typically include the head gasket, base gasket, and critical upper‑end seals (like valve cover gasket and some exhaust gaskets) but may not include every O‑ring or seal on the engine. Check the component list from the seller or Cometic catalog to confirm exactly what is in kit C7757 for your application.
Cometic head gaskets are generally intended for one‑time use. Reuse is not recommended, especially on high‑compression or performance applications, as it can lead to sealing issues and premature failure.
Some Cometic performance gasket kits use different thicknesses from OEM, which can raise or lower compression slightly. You must compare the listed compressed thickness of the Cometic head and base gaskets to the OEM specs from your service manual or parts fiche to know for sure for kit C7757.
If the previous gasket failed, or if the head or cylinder deck shows signs of warpage, pitting, or damage, resurfacing may be necessary. Use a straightedge and feeler gauge within the limits specified in your service manual. Excess warpage must be corrected by a machine shop for long‑term reliability.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- metric socket set
- torque wrench (inch‑lb and/or ft‑lb depending on engine)
- feeler gauges (for valve check/adjustment, if required by service manual)
- plastic scraper or razor blade with care (for old gasket removal)
- brake cleaner or contact cleaner (for final surface degreasing)
- shop rags
- service manual for torque specs and tightening sequence
Pro Tips
- Have the factory service manual open and follow the torque sequence and values exactly.
- Lay out all new gaskets next to the engine before disassembly so you know exactly where each goes.
- Use a straightedge and feeler gauge to check cylinder head and cylinder deck for warpage if the engine had a blown gasket.
- Dry‑fit each gasket first to verify alignment of oil and coolant holes before final install.
- Blow out head bolt holes with compressed air so no oil or coolant remains that could cause hydraulic lock and false torque readings.
Common Mistakes to Avoid
- Not cleaning the gasket surfaces completely (old gasket material or sealant left behind)
- Reusing old head bolts or studs where OEM specifies one‑time‑use (torque‑to‑yield) hardware
- Skipping or guessing torque specs and tightening sequence
- Installing gaskets backward or misaligned with oil/coolant passages
- Using RTV or sealant where a dry install is specified (can cause leaks or block oil passages)
- Not re‑torquing the head if the service manual calls for it after heat‑cycle
Comparison vs Stock/OEM
Cometic high performance top end gasket kits typically use premium materials and construction aimed at improved sealing and durability over OEM, particularly under high cylinder pressures found in racing or high‑compression builds.
Improvements
- Multi‑layer steel (MLS) or advanced fiber constructions designed to maintain seal under higher combustion pressures and temperatures (exact construction for C7757 must be confirmed in catalog).
- Tighter manufacturing tolerances for bore size and gasket thickness for consistent compression ratio.
- Often better resistance to detonation, fretting, and micromovement between head and cylinder than many OEM paper/fiber gaskets.
Considerations
- Some performance gaskets may require surfaces that are flatter and smoother than OEM specifications; warped or rough decks can reduce gasket life.
- If compressed thickness differs from OEM, tuning changes (fuel, ignition) might be advisable on highly tuned engines.
- Always verify that the bore size and thickness match your build requirements.
Durability & Warranty
Expected Lifespan
On a correctly assembled, stock or mildly modified engine with flat and clean sealing surfaces, a Cometic top end gasket kit should last at least as long as an OEM gasket set between rebuild intervals. Exact lifespan depends heavily on engine type, maintenance, and operating conditions.
Warranty
Cometic typically offers a limited warranty against defects in materials and workmanship, but gasket life and failures related to installation, detonation, or engine condition are usually not covered. Check the specific warranty terms from Cometic or the seller.
Maintenance
No direct maintenance to the gaskets themselves, but maintaining proper engine cooling, fueling, and ignition timing—as well as regular oil changes—will help maximize gasket life. Periodic compression or leak‑down tests can be used to monitor top‑end sealing health.
What Others Are Saying
Reviews from across the web
