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Start ShoppingCometic C9214 Sportster Head/Base Gasket Kit – MLS Multi-Layer Steel Gaskets for Harley-Davidson Engines
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Description
Upgrade your Harley-Davidson Sportster's engine performance with Cometic's premium C9214 head/base gasket kit. Engineered for high-output applications, this MLS (Multi-Layer Steel) and composite gasket combination ensures optimal sealing, compression, and long-term reliability for street and track use.
Key Features
- MLS Multi-Layer Steel Head Gaskets: Constructed with 0.030–0.040 in thickness for superior sealing under high pressure and temperature extremes.
- Composite Base Gasket Design: Precision-engineered base gaskets provide consistent sealing while accommodating engine wear and thermal expansion.
- Complete Kit Includes: Front/rear head gaskets + front/rear base gaskets for full engine sealing without compatibility issues.
- 3.500 in Bore Compatibility: Specifically tuned for 1200cc Sportster engines (confirm fitment for your exact model).
- USA-Made Construction: Manufactured in the USA with aerospace-grade materials for unmatched durability.
Why Choose This Product
Cometic's C9214 kit delivers factory-level sealing performance for modified or stock Sportster engines. The combination of MLS head gaskets and composite base gaskets prevents oil leaks, maintains compression integrity, and reduces the risk of overheating. Designed for both daily riding and high-performance applications, this kit ensures your engine runs smoothly with minimal maintenance. Perfect for riders seeking reliable, long-lasting sealing solutions without compromising power output.
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Upgrade your Harley-Davidson Sportster's engine performance with Cometic's premium C9214 head/base gasket kit. Engineered for high-output applications, this MLS (Multi-Layer Steel) and composite gasket combination ensures optimal sealing, compression, and long-term reliability for street and track use.
Key Features
- MLS Multi-Layer Steel Head Gaskets: Constructed with 0.030–0.040 in thickness for superior sealing under high pressure and temperature extremes.
- Composite Base Gasket Design: Precision-engineered base gaskets provide consistent sealing while accommodating engine wear and thermal expansion.
- Complete Kit Includes: Front/rear head gaskets + front/rear base gaskets for full engine sealing without compatibility issues.
- 3.500 in Bore Compatibility: Specifically tuned for 1200cc Sportster engines (confirm fitment for your exact model).
- USA-Made Construction: Manufactured in the USA with aerospace-grade materials for unmatched durability.
Why Choose This Product
Cometic's C9214 kit delivers factory-level sealing performance for modified or stock Sportster engines. The combination of MLS head gaskets and composite base gaskets prevents oil leaks, maintains compression integrity, and reduces the risk of overheating. Designed for both daily riding and high-performance applications, this kit ensures your engine runs smoothly with minimal maintenance. Perfect for riders seeking reliable, long-lasting sealing solutions without compromising power output.| SKU | GMD8FE97A2 |
|---|---|
| MPN | C9214 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | XLH 883 | 1986-1990 |
| Harley-Davidson | XLH 1200 | 1988-1990 |
| Harley-Davidson | XL 1200 | 1988-1990 |
Frequently Asked Questions
No. It is designed for specific late‑1980s Sportster 883/1200 engines. Always verify by year, model, and by cross‑referencing your OEM head and base gasket part numbers with the retailer’s fitment chart.
No. Like almost all head gaskets, Cometic MLS and composite gaskets are designed for one‑time use. They should be replaced any time the head is removed.
Generally no. Cometic designs its MLS head gaskets to be installed dry on clean, smooth surfaces. Some builders may use a light spray on base gaskets, but follow Cometic’s latest recommendations and your engine builder’s guidance.
It is primarily intended for stock‑bore Sportster applications. For big‑bore or high‑compression builds, Cometic offers specific bore and thickness options; use the exact part number recommended for your piston and bore size.
No. C9214 includes head and base gaskets only. You will still need rocker box, intake, exhaust, and other top‑end gaskets and seals for a complete top‑end rebuild.
Installation Guide
Difficulty
Medium
Est. Time
3 hr 0 min
Tools Required
- Factory service manual or torque spec reference
- Basic SAE socket set (3/8 in and 1/2 in drive)
- Torque wrench (inch‑pound and foot‑pound range)
- Allen/hex sockets and Torx bits (for Sportster hardware)
- Breaker bar
- Feeler gauges (for valve adjustment/checks)
- Scraper or plastic razor for old gasket removal
- Scotch‑Brite pads or equivalent for surface cleaning (used carefully)
- Straightedge for checking head/cylinder deck flatness
- Degreaser/brake cleaner and lint‑free rags
Pro Tips
- Verify cylinder and head mating surfaces for flatness with a straightedge before installing new gaskets; resurface if out of spec.
- Lay out the gaskets on a clean bench in front/rear order before starting so you don’t mix them up mid‑job.
- Chase head bolt threads with a tap and blow out blind holes to prevent hydraulic lock and inaccurate torque.
- Dry‑fit all components first to confirm clearance and orientation, especially on modified or big‑bore engines.
- Use a calibrated torque wrench and follow the factory tightening sequence in several equal steps to final spec.
- Allow the engine to fully cool after the first full heat cycle, then recheck for any signs of weeping at the gasket joints.
Common Mistakes to Avoid
- Installing the head gaskets upside‑down or in the wrong cylinder position
- Reusing old head bolts or hardware that has stretched or is corroded
- Failing to thoroughly clean and dry mating surfaces, leaving old gasket material or sealant
- Not following the correct torque sequence and staged torque values for the head bolts
- Skipping a heat‑cycle and re‑torque procedure if required by the builder or engine spec
- Using additional sealant on MLS head gaskets when the manufacturer intends a dry installation
Comparison vs Stock/OEM
Cometic C9214 is a high‑performance replacement for OEM Harley‑Davidson Sportster head and base gaskets, designed to resist blow‑by and leakage better than many factory gaskets, especially under higher cylinder pressures.
Improvements
- Multi‑Layer Steel (MLS) construction on head gaskets for superior sealing and clamp load distribution
- Better long‑term resistance to heat cycling and detonation compared to many OEM composite gaskets
- Widely trusted in performance and racing Sportster engines
- Precision bore and thickness options tailored to specific applications
Considerations
- Requires very clean and flat mating surfaces to perform correctly
- Not intended as a universal fit for all Sportsters – correct part must match bore and year
- Some builders may prefer thicker or thinner gaskets to fine‑tune compression; C9214 is a specific spec and may not suit every custom build
Durability & Warranty
Expected Lifespan
Comparable to or better than OEM head/base gaskets when installed correctly on properly machined surfaces; commonly used in high‑mileage and performance applications.
Warranty
Covered by Cometic’s standard manufacturer defect warranty (no coverage for improper installation or engine‑related failures).
Maintenance
No routine maintenance required on the gasket itself; periodic inspection for external oil or combustion leaks is recommended, particularly after the first few hundred miles on a fresh top‑end build.
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