YAMAHA 6CJ-W009A-01-9S Cylinder Head F70LA 6CJ-11111-10-9S B-146

( Manufacturer Part Number: 6CJ-W009A-01-9S ), ( Part Type: Cylinder Head ), ( Warranty: 90 Day )

Review YAMAHA Oem Cylinder Head Pn#

The **Yamaha 6CJ-W009A-01-9S F70LA Cylinder Head (Part Number: 6CJ-11111-10-9S, B-146)** is a high-performance, precision-engineered component designed exclusively for Yamaha s legendary **F70LA** and **F70LA-based** outboard motors, including models like the **F70LA, F70LA-E, and select F70LA variants**. This cylinder head is a critical part of the engine s combustion system, playing a pivotal role in maintaining optimal power output, fuel efficiency, and overall reliability. Crafted from **high-grade aluminum alloy**, the head is engineered to withstand the intense heat and pressure generated during combustion while ensuring minimal thermal expansion, which helps preserve critical clearances and sealing integrity over extended use.

The **6CJ-W009A-01-9S** features a **dual-valve design** with **intake and exhaust valves** that are meticulously machined to Yamaha s exacting standards, ensuring smooth airflow and efficient scavenging of exhaust gases. The **valve guides and seats** are precision-ground to prevent premature wear, while the **spark plug boss** is strategically positioned for optimal ignition timing, contributing to a cleaner burn and reduced carbon buildup. The head is equipped with **high-quality gaskets**, including a **compression ring and exhaust port gasket**, which seal the combustion chamber securely, preventing leaks that could compromise performance or lead to overheating.

One of the standout features of this cylinder head is its **interference-fit valve springs**, which provide consistent valve closure force, reducing the risk of valve float at high RPMs a common issue in high-performance marine engines. The **exhaust port design** is optimized for **scavenging efficiency**, helping to expel exhaust gases quickly and improve cylinder filling during the intake stroke, which directly enhances horsepower and torque. Additionally, the head includes **integrated cooling passages** that work in tandem with the engine s cooling system to dissipate heat effectively, preventing thermal stress on critical components.

For maintenance and longevity, the **6CJ-W009A-01-9S** is designed for easy access, with **clearly marked bolt patterns** and **standardized fasteners** that align with Yamaha s service manual specifications. This ensures that technicians can perform routine inspections, valve adjustments, and gasket replacements with minimal hassle. Whether used in **rebuilding a stock F70LA engine** or as part of a **performance upgrade**, this cylinder head delivers the durability and precision required for demanding marine applications, from recreational boating to competitive racing. Its compatibility with **Yamaha s 6CJ series fuel injection systems** further ensures seamless integration with modern emissions standards and fuel delivery technologies, making it an essential component for anyone seeking to restore or enhance the performance of their Yamaha outboard.

### **Pros and Cons of buying a Yamaha 6CJ-W009A-01-9S (F70LA) Cylinder Head and 6CJ-11111-10-9S Valve Cover (B-146)**

1. **OEM Quality and Reliability** These parts are genuine Yamaha components, ensuring compatibility and durability. Yamaha engines are known for their robust construction, and aftermarket parts can sometimes introduce inconsistencies.

2. **Direct Fitment** The **6CJ-W009A-01-9S** is a cylinder head for the **F70LA engine** (common in Yamaha FZ1, FZ6, and similar models). The **6CJ-11111-10-9S** is the valve cover for the **6CJ engine family**, including the F70LA. Both parts are designed specifically for this engine, reducing the risk of improper fitment issues.

3. **Performance and Efficiency** A well-maintained cylinder head and valve cover contribute to better engine performance, improved fuel efficiency, and reduced emissions. If these parts are worn or damaged, replacing them can restore optimal function.

4. **Long-Term Cost Savings** While the upfront cost may be higher than aftermarket alternatives, genuine Yamaha parts often last longer, reducing the need for frequent replacements. This can be cost-effective in the long run, especially for high-mileage or performance-oriented bikes.

5. **Warranty and Support** Purchasing from an authorized Yamaha dealer or a reputable seller ensures warranty coverage. If there are defects, Yamaha s customer service can assist with replacements or refunds.

6. **Resale Value** Keeping the bike in top condition with genuine parts helps maintain its resale value, which is important if you plan to sell the motorcycle in the future.

7. **Compatibility with Upgrades** If you plan to modify your engine (e.g., porting, turbocharging, or performance tuning), a high-quality cylinder head is essential. The **6CJ-W009A-01-9S** is a later revision of the head, which may offer slight improvements over older versions.

8. **Ease of Installation** Since these are stock parts, they are designed to be installed without major modifications. This makes the job easier for both DIY enthusiasts and professional mechanics.

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1. **Higher Cost** Genuine Yamaha parts are significantly more expensive than aftermarket alternatives. For example, the **6CJ-W009A-01-9S** cylinder head may cost **$200 $300**, while aftermarket options could be **$80 $150**. This can be a barrier for budget-conscious buyers.

2. **Potential for Overkill** If the cylinder head or valve cover is only slightly worn or not the primary issue, replacing them with new OEM parts may be unnecessary. A thorough inspection by a mechanic could reveal that only specific components (e.g., valves, seals, or gaskets) need replacement.

3. **Longer Wait Times** Genuine Yamaha parts may not be immediately available, especially if ordered from a dealer. Aftermarket parts often have faster shipping times, which can be convenient for urgent repairs.

4. **Risk of Counterfeit Parts** If purchasing from untrusted sellers (e.g., eBay, Facebook Marketplace, or non-authorized online stores), there is a risk of receiving **counterfeit or refurbished parts**. Always buy from reputable sources like Yamaha dealers, official distributors, or well-reviewed online retailers.

5. **Labor Costs** Even if the parts are genuine, installation may require professional labor, especially if the mechanic charges a premium for OEM parts. DIY installation is possible but may void warranties or require additional tools.

6. **Potential for Unnecessary Replacement** Some mechanics may recommend replacing the cylinder head or valve cover as a precautionary measure, even if it s not strictly necessary. This can lead to unnecessary expenses if the parts are still in good condition.

7. **Weight and Bulk** Genuine parts are heavier and bulkier than some aftermarket alternatives, which may not be a concern for most riders but could be a minor consideration for those prioritizing lightweight modifications.

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- You prioritize **long-term reliability, performance, and resale value**.

- Your bike requires **genuine parts for warranty or insurance purposes**.

- You are **not on a tight budget** and want to avoid potential issues with aftermarket parts.

- You plan to **modify or maintain the engine** at a high standard.

- The parts are **not strictly necessary** (e.g., minor wear, no performance loss).

- You are **working with a limited budget** and can verify the condition of existing parts.

- You can **find high-quality aftermarket alternatives** with good reviews and warranties.

Then, **aftermarket or refurbished options** may be a more cost-effective choice.

---

1. **Get a Professional Inspection First** Before purchasing, have a **trusted mechanic** inspect the cylinder head and valve cover. They can determine if replacement is necessary or if only specific components (e.g., gaskets, valves, or seals) need attention.

- **Authorized Yamaha dealers** (for genuine parts).

- **Reputable aftermarket suppliers** (e.g., **Yamaha Parts Direct, RockAuto, or specialized motorcycle part stores**).

- **Refurbished marketplaces** (if the parts are in good condition and come with a warranty).

3. **Consider Refurbished or Remanufactured Parts** If the parts are **not damaged but worn**, a **remanufactured cylinder head** (e.g., from **Yamaha s remanufacturing program** or third-party services like **JE Parts**) can offer a **cost-effective middle ground** between new and aftermarket.

- **Yamaha s official website or authorized distributors**.

- **Well-reviewed sellers on eBay, Amazon, or RockAuto** (with verified feedback).

- **Local Yamaha dealers** (for physical inspection before purchase).

5. **Factor in Labor Costs** If you re not comfortable installing these parts yourself, **get multiple quotes** from mechanics to ensure you re not overpaying for labor.

6. **Check for Bundles or Discounts** Sometimes, buying **multiple parts together** (e.g., head gaskets valve cover) can reduce costs.

- **If money is no object and you want the best long-term solution Buy genuine Yamaha parts.**

- **If you re on a budget but still want quality Consider remanufactured or high-end aftermarket parts with warranties.**

- **If the parts are not critical Inspect first and replace only what s necessary.**

For most riders, **genuine Yamaha parts are the safest choice**, especially if the bike is a **high-value or performance-oriented model**. However, **aftermarket or refurbished options can be viable** if thoroughly researched and tested. Always prioritize **quality over cost** when it comes to critical engine components.

Details:

I do not sell junk. Removed in good working condition. Removed from a great running engine with clean oil good compression. Parts may have knocks, dings, scratches and in some cases, light corrosion.

OEM YAMAHA F70LA CYLINDER HEAD PN# 6CJ-W009A-01-9S / 6CJ-11111-10-9S B-146. Ships free to the lower 48 of US. 90 DAY WARRANTY. I will add a note if there are any other known issues.

I will work with you to make sure are happy. Guaranteed quality used parts or your money back. INVENTORY B-146. From there the cost is up to you.

part #: 6cjw009a019s prices

• $244.95-$799.99

specifications ouboaen:

• for makes: Yamaha
• mpn: 6cj-w009a-01-9s
• part type: Cylinder Head
• warranty: 90 Day

returns ouboaen:

• time: 60 Days
• policy: Returns Accepted
• paid by: Buyer

payments ouboaen:

• other
• wallet: Google-pay
• credit card: Diners-club

general ouboaen:

• Boat Parts > Outboard Engines Components > Other
• condition: Used

shipping ouboaen:

• transit: 3-9 Days
• class: Standard
• carrier: USPS
• cost: $0.00
• service: USPS Ground Advantage
• type: Fixed

seller ouboaen:

• rating: 99.9%
• city: Milton, Florida
• # reviews: 3600

offer ouboaen:

• best offers: True
• started: April 13, 2026
• options: Ship-to-home
• sold: 0
• quantity: 1
• availability: In Stock

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