YAMAHA 879-11631-00-96 Nos Piston Set U22573 GPX338F G2U

( Part Type: Piston ), ( Placement On Vehicle: Front ), ( UPC: 879116310096 )

Review YAMAHA Nos Piston Set Bore G2u fits GPX STD 1974

The **Yamaha GPX338F (1974 model) GPX Piston Set (Part Number: 879-11631-00-96, U22573, NOS 1974)** is a meticulously crafted, high-performance replacement piston set designed specifically for Yamaha s legendary GPX338F outboard engine, a classic in the world of marine propulsion. This **new old stock (NOS) assembly** is engineered to restore peak performance, reliability, and longevity to your vintage Yamaha outboard, ensuring it operates with the same precision and power as when it left the factory. The piston set includes a **standard (STD) configuration**, featuring a **forged aluminum piston** with a **smooth, precision-machined surface** to minimize friction and wear, while the **compression ring** is crafted from high-quality, heat-resistant material to maintain optimal sealing under high-temperature conditions. The **wrist pin** is designed for durability, with a robust construction that resists bending and fatigue, even under heavy loads. This piston set is ideal for enthusiasts and restorers seeking to revive their 1974 GPX338F to factory specifications, offering a seamless fit and enhanced efficiency. Whether you're preparing for a weekend cruise, a restoration project, or simply maintaining your classic Yamaha, this piston set ensures that your engine runs with the same smooth, powerful performance it was built for without the compromises of aftermarket alternatives. Built to Yamaha s exacting standards, this NOS component guarantees compatibility and performance, making it a must-have for anyone serious about preserving the integrity of their vintage outboard.

### **Pros and Cons of buying a Yamaha GPX338F Piston Set (Part Number: 879-11631-00-96 / U22573, NOS, 1974 Model)**

1. **Original Equipment Manufacturer (OEM) Quality** This is a **New Old Stock (NOS)** part, meaning it was never installed and is still in factory-sealed condition. Yamaha is known for durable, high-quality components, so you can expect reliable performance.

2. **Direct Replacement Fit** The part number (879-11631-00-96) is specific to the **GPX338F engine**, ensuring an exact fit without modifications. This reduces the risk of compatibility issues.

3. **Minimal Wear & Long Service Life** Since the part is unused, it should have the same wear resistance as a new factory piston set, potentially extending engine life if installed properly.

4. **Easier Maintenance & Replacement** Because it s a standard piston set (not a custom or aftermarket upgrade), installation is straightforward, requiring only basic mechanical skills.

5. **Cost-Effective for a Reliable Part** While not the cheapest option, it avoids the risk of buying a used or counterfeit part, which could fail prematurely.

6. **Supports Classic Yamaha Engines** If you re restoring or maintaining a **1974 GPX338F**, this is the most authentic choice, preserving original performance characteristics.

---

1. **Limited Availability & Lead Times** NOS parts, especially for older Yamaha models, can be difficult to source. You may need to wait for shipping or rely on specialty suppliers, which could delay repairs.

2. **Higher Price Than Aftermarket Alternatives** While OEM parts are reliable, they are often more expensive than third-party piston sets. If budget is a concern, aftermarket options (from reputable brands like **Mahle, Kolbenschmidt, or JE**) may offer similar performance at a lower cost.

3. **Potential for Overkill if Engine is Already Worn** If the rest of the engine (crankshaft, bearings, cylinder walls) is significantly worn, replacing just the pistons may not fully restore performance. A full rebuild might be necessary.

4. **Installation Requires Skill** While the part is a direct fit, improper installation (e.g., incorrect ring gap, improper torque, or wrong piston-to-wall clearance) can lead to engine damage. If you re not experienced, professional labor may be needed.

5. **No Warranty on NOS Parts** Unlike new factory parts, NOS items typically come with no manufacturer warranty, meaning you bear full responsibility for defects or failures.

6. **Environmental & Ethical Considerations** NOS parts are often sourced from returned or excess inventory, which some argue contributes to waste. If sustainability is a concern, aftermarket or remanufactured parts may be a more eco-friendly choice.

---

- You prioritize **authenticity and reliability** for your classic engine.

- You re willing to pay a premium for an **unopened, high-quality OEM part**.

- You have access to the part (avoiding long lead times).

- The rest of the engine is in decent condition, as this is just one component of a full rebuild.

However, if you re on a **tight budget**, prefer **modern aftermarket options**, or need **faster availability**, third-party piston sets may be a better alternative.

- **If restoring a rare or high-value Yamaha GPX338F engine** **Proceed with the NOS piston set** for maximum authenticity and peace of mind.

- **If budget or time is a concern** Consider a **high-quality aftermarket piston set** (e.g., **Mahle or Kolbenschmidt**) that matches the OEM specifications.

- **If unsure about installation** Have a **mechanic with small-engine experience** perform the work to ensure proper fit and torque.

Ultimately, the best choice depends on your **priorities (authenticity vs. cost), engine condition, and access to parts**. For a classic Yamaha, the NOS option is the safest long-term investment.

Details:

part #: 879116310096 prices

• $59.95-$74.99

specifications cyclevintagee:

• for models: Gpx, Std
• for makes: Yamaha
• for years: 1974
• part type: Piston
• placement on vehicle: Front
• upc: 879116310096

returns cyclevintagee:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

seller cyclevintagee:

• rating: 96.2%
• # reviews: 40484
• city: Bensenville, Illinois

general cyclevintagee:

• condition: Used
• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories

shipping cyclevintagee:

• transit: 6-12 Days
• type: Fixed
• carrier: USPS
• service: USPS Ground Advantage
• cost: $0.00
• class: Standard

payments cyclevintagee:

• credit card: Discover
• wallet: Google-pay
• other

offer cyclevintagee:

• availability: In Stock
• started: February 13, 2026
• quantity: 1
• options: Ship-to-home
• sold: 0

Yamaha U22573 Is Similar To:

• 0000 Yamaha Yg1 Yf1 Yj1 Yj2 Nos Oem Turn Signal Lens White X 2 (34.4% similar) Brand new old stock turn signal lenses white set of 2 bx TT12...(May 23rd, 2016)
• 010159 Fmf Racing Nos Yamaha (10.3% similar) Nos yamaha FM YZ125 pipe o-ring kit set...(August 1st, 2017)
• 05-2802 Yamaha Rocky Piston Set Complete Not Wiseco Vertex Pro (31.8% similar) This is a 2ND over piston kit. Fits the yamaha DT-1. Free shipping anywhere in the us. This is a complete kit new old stock rocky piston. Piston, rings, cir clips, and wrist pin...(April 25th, 2018)
• 1 5vy-26290-00-00 Yamaha Nos Rear View Mirror Assy Right (24.8% similar) This mirror came off of my r1 that fell over inside a trailer when it was being strapped down. This has been sitting in a box my garage for about 8 years now. This part is used and it only scuffed. Please see my other parts for this bike that I have sale as well...(May 9th, 2018)
• 103-93-a Rensen Honda Yamaha Nos Acorn Engine Cylinder Head Nut Set (21.8% similar) Please look at all the pictures and read whole. They may not be clean. Any questions. They may have repairs. Oem original equipment manufacturer which may be new or used items for that machine. They may need some repairs. It is also cheaper if you do not need a lift gate truck. Not looking at the ...(April 25th, 2018)
• 109-14451-00 Yamaha Nos Air Filter Oem New Riverside (21.3% similar) It is in excellent new condition. Here is a nos air filter for your yamaha YJ2...(May 27th, 2018)
• 109-25437-10-00 Yamaha Nos Genuine Rear Sprocket Tooth Oem (27.2% similar) The actual item is shown. Oem part number. This is in nos unused condition. This may or not come in the original packaging. The majority of items we sale are shipped through USA postal service USPS and or FedEx with delivery confirmation. Up for sale is this genuine yamaha 37T rear sprocket part as ...(January 7th, 2019)
• 122-11601-21 Yamaha Vintage Motorcycle Dirt Bike Over Piston Ring Set (29.1% similar) This listing is for an oem yamaha piston ring set. 50MM or 2ND over piston ring set...(December 26th, 2018)
• 122-11610-11 Yamaha Vintage Motorcycle Dirt Bike Over Piston Ring Set (29.1% similar) These are nos parts, the part number for this piston ring set is. This listing is for an oem yamaha piston ring set. 25MM or 1ST over piston ring set...(December 26th, 2018)
• 122-14753-01 Nos O.e.m N.o.s Yamaha (9.7% similar) I have two of these. Listing at 23...(May 17th, 2017)
• 122-21510-00-00 Superior New Top Yamaha Front Fender Nos Vintage Made In (23.6% similar) USA buyer pays new old stock 1960 'S-70S vintage after market chrome front fender, made in japan. Shipping cost...(November 12th, 2018)