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Start ShoppingCometic C9553 MLS Head/Base Gasket for Sportster Engines – Durable & Reliable
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Description
Upgrade your Sportster engine's sealing performance with the Cometic C9553 MLS head/base gasket. Engineered for precision fit and long-lasting reliability, this gasket ensures optimal compression and prevents leaks for maximum power and efficiency.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides exceptional sealing strength and resistance to heat, oil, and pressure for reliable engine performance.
- Precision Fit for 3.875 in. Bore: Perfectly sized for Sportster engines to ensure a flawless seal and prevent compression leaks.
- 0.055 in. Thickness: Optimized thickness for balanced sealing pressure and reduced risk of warping or damage.
- Lightweight Design (0.2 lbs): Reduces engine strain while maintaining structural integrity and durability.
- Durable for Long-Lasting Performance: Built to withstand extreme conditions and maintain sealing integrity over time.
Why Choose This Product
Whether you're a rider seeking reliability or a racer demanding peak performance, the Cometic C9553 gasket delivers unmatched sealing capabilities. Its MLS construction prevents blow-by and oil leaks, while the precise fit ensures compatibility with 3.875 in. bore Sportster engines. The lightweight design minimizes stress on engine components, making it ideal for high-performance applications. Trust Cometic's reputation for quality to keep your engine running smoothly and efficiently.
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Upgrade your Sportster engine's sealing performance with the Cometic C9553 MLS head/base gasket. Engineered for precision fit and long-lasting reliability, this gasket ensures optimal compression and prevents leaks for maximum power and efficiency.
Key Features
- Multi-Layer Steel (MLS) Construction: Provides exceptional sealing strength and resistance to heat, oil, and pressure for reliable engine performance.
- Precision Fit for 3.875 in. Bore: Perfectly sized for Sportster engines to ensure a flawless seal and prevent compression leaks.
- 0.055 in. Thickness: Optimized thickness for balanced sealing pressure and reduced risk of warping or damage.
- Lightweight Design (0.2 lbs): Reduces engine strain while maintaining structural integrity and durability.
- Durable for Long-Lasting Performance: Built to withstand extreme conditions and maintain sealing integrity over time.
Why Choose This Product
Whether you're a rider seeking reliability or a racer demanding peak performance, the Cometic C9553 gasket delivers unmatched sealing capabilities. Its MLS construction prevents blow-by and oil leaks, while the precise fit ensures compatibility with 3.875 in. bore Sportster engines. The lightweight design minimizes stress on engine components, making it ideal for high-performance applications. Trust Cometic's reputation for quality to keep your engine running smoothly and efficiently.| SKU | GM954082EC |
|---|---|
| MPN | C9553 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster (XL883, XL1100, XL1200) | 1986-2003 |
| Harley-Davidson | Sportster Evolution | 1991-2003 |
Frequently Asked Questions
No, C9553 fits 1986-2003 Sportster models with 3.875 in. bore. Check 2004+ models for C9885 or similar.
Yes, 0.055 in. MLS vs. stock paper gasket ~0.040 in. Ideal for higher compression builds.
Not required, but recommended for optimal sealing in high-performance applications.
Yes, MLS construction supports up to 12:1+ compression ratios.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- torque wrench
- socket set
- gasket scraper
- engine degreaser
Pro Tips
- Clean all surfaces with brake cleaner
- Follow Harley torque specs (typically 12-18 ft-lbs)
- Use assembly lube on bolts
Common Mistakes to Avoid
- Not cleaning mating surfaces thoroughly
- Incorrect torque sequence
- Over-torquing bolts
Comparison vs Stock/OEM
Multi-layer steel vs. stock paper/composite gasket
Improvements
- Superior sealing under high pressure
- Better heat resistance
- Handles higher compression
- Longer lifespan
Considerations
- Requires cleaner surfaces
- Slightly thicker than stock
Durability & Warranty
Expected Lifespan
Engine life (no replacement needed unless engine work)
Warranty
1 year manufacturer defect warranty
Maintenance
Inspect during valve service; no regular maintenance required
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