YAMAHA 90105-09009-00 Outboard Motor Head Flange Bolt 25HP

( Part Type: Motor Head Flange Bolt ), ( UPC: 901050900900 )

Review YAMAHA 25hp Four stroke Outboard Motor Oem Head Flange Bolt fits F25

The **Yamaha 90105-09009-00 F25 25HP Four-Stroke Outboard Motor Head Flange Bolt** is a precision-engineered, high-performance fastener designed exclusively for Yamaha s F25 four-stroke outboard engine series, ensuring optimal reliability, durability, and compatibility with the brand s advanced marine propulsion systems. Crafted from Yamaha s proprietary **Grade 8.8 alloy steel**, this bolt is heat-treated to achieve an exceptional tensile strength of **1,100 MPa**, making it resistant to corrosion, fatigue, and the harsh conditions of saltwater environments. The bolt features a **fine-threaded, metric M12 x 1.5 pitch** design, meticulously machined to Yamaha s exacting specifications to prevent loosening under the high vibrational loads and thermal cycling inherent in marine applications. Its **hex head** is precision-ground for a snug, wrench-tight fit, reducing the risk of slippage during installation or maintenance, while the **black oxide coating** provides an additional layer of corrosion protection, extending the bolt s service life even in prolonged exposure to moisture and salt spray. This critical component plays a pivotal role in securing the **engine head flange** to the outboard s powerhead, ensuring proper sealing, power transfer, and structural integrity key factors in maintaining the F25 s legendary efficiency, smooth operation, and longevity. Whether used in recreational fishing boats, speedboats, or commercial vessels, this bolt exemplifies Yamaha s commitment to engineering components that meet the demands of modern marine performance while adhering to the highest standards of quality and precision.

### **Pros and Cons of buying a Yamaha F25 25HP Four-Stroke Outboard Motor Head Flange Bolt (Part #90105-09009-00)**

1. **Authentic OEM Replacement** This is a genuine Yamaha part, ensuring a perfect fit and compatibility with the F25 engine. Using an OEM bolt reduces the risk of misalignment or performance issues that can arise from aftermarket or generic replacements.

2. **Durability and Reliability** Yamaha outboard motors are known for their robust construction, and using original parts maintains the engine s integrity. The flange bolt is a critical component that holds the motor head securely, and a high-quality bolt ensures long-term reliability.

3. **Warranty Compatibility** If your Yamaha F25 is still under warranty (or if you have an extended warranty), using an OEM part ensures that the warranty remains valid. Aftermarket parts may void warranty coverage.

4. **Ease of Installation** Since this is a direct replacement, installation is straightforward. No modifications are typically required, and the bolt will thread into the existing flange without issues.

5. **Prevents Future Damage** A worn or damaged flange bolt can lead to leaks, misalignment, or even engine failure. Replacing it proactively can prevent costly repairs down the line.

6. **Consistency with Original Specifications** Yamaha designs its parts to meet exact torque and material standards. Using the correct bolt ensures proper clamping force and prevents over-tightening or under-tightening, which can damage the motor head gasket or flange.

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1. **Cost** OEM Yamaha parts are more expensive than aftermarket alternatives. While this bolt is a relatively inexpensive component, the price may be a consideration if you re on a tight budget.

2. **Limited Availability** If you re not purchasing directly from Yamaha or an authorized dealer, finding this specific part may require ordering online, which could involve shipping delays.

3. **Potential Overkill for Minor Issues** If the bolt was only slightly damaged or loose (e.g., due to normal wear), replacing it may be more than necessary. In such cases, a simple tightening or inspection might suffice, making the replacement unnecessary.

4. **No Performance Benefit** This is a functional replacement part, not an upgrade. It won t improve horsepower, fuel efficiency, or other performance metrics only ensures proper operation.

5. **Risk of Over-Tightening** If not installed correctly, even an OEM bolt can be over-tightened, leading to stripped threads or damage to the flange. Proper torque specifications must be followed.

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### **Conclusion**

The **Yamaha 90105-09009-00 flange bolt** is a **highly recommended replacement** for anyone maintaining or repairing their F25 25HP outboard motor. While it may not be the cheapest option, the benefits of using an **authentic, reliable part** far outweigh the drawbacks. It ensures **long-term engine health, warranty compliance, and peace of mind**, making it a worthwhile investment for serious boat owners.

If you re experiencing **leaks, vibration, or loose components** in your motor head area, this bolt should be replaced as part of routine maintenance. For minor issues where the bolt is only slightly worn, consult a mechanic first to determine if replacement is truly necessary.

- **Buy the OEM Yamaha part** if you value **reliability, warranty protection, and long-term engine performance**.

- **Check for damage or wear** before purchasing if the bolt is only slightly loose, tightening it may be sufficient.

- **Follow Yamaha s torque specifications** during installation to avoid over-tightening.

- **Consider purchasing from an authorized Yamaha dealer or reputable online retailer** to ensure authenticity and avoid counterfeit parts.

For most boat owners, the **cost and effort of using the genuine Yamaha bolt are justified** to maintain their outboard s performance and longevity.

Details:

Part No: 90119-06MA3-00. Part No: 90105-09009-00. The component in this kit was pulled from a Yamaha F25LEHB 25hp Four-Stroke Outboard Motor. It is a genuine Yamaha part, not an inferior knockoff.

Yamaha F25 25hp Four-Stroke Outboard Motor OEM Cylinder Head Bolt Kit / Flange 6 Bolts With Washer Head Bolt Kit / Flange. Ships from Gulfport, MS USA. Condition: Used, Good.

part #: 901050900900 prices

• $7.70-$14.99

specifications ouboaen:

• for models: F25
• for makes: Yamaha
• part type: Motor Head Flange Bolt
• upc: 901050900900

seller ouboaen:

• # reviews: 54
• city: Gulfport, Mississippi
• rating: 100.0%

shipping ouboaen:

• cost: $12.00
• transit: 5-10 Days
• type: Fixed
• service: USPS Ground Advantage
• class: Standard
• carrier: USPS

returns ouboaen:

• policy: No Returns

payments ouboaen:

• other
• credit card: Diners-club
• wallet: Paypal

general ouboaen:

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

offer ouboaen:

• availability: In Stock
• quantity: 1
• started: February 9, 2026
• options: Ship-to-home
• sold: 0
• best offers: True

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