SPI 09-803N Piston GP338 SL338 60MM

( Brand: Spi ), ( Manufacturer Part Number: 09-803N ), ( Part Type: Piston )

Review SPI Stock Bore Piston Kits Yamaha 60mm fits GS340 1973–1976-77

Introducing the SPI 09-803N piston, a high-performance replacement option for Yamaha outboard engines used on various models from the 1970s. This piston is specifically designed for the 60mm size and is compatible with the following models: 1973 GP338, 1974 SL338, 1976-77 GS340.

The SPI 09-803N piston is meticulously crafted from forged aluminum alloy, ensuring superior strength and durability. Forged pistons are known for their ability to withstand the high pressures and temperatures generated by the engine, making them an ideal choice for high-performance applications or for engines that have seen extensive use.

This piston features a state-of-the-art ring package, including a compression ring, oil control ring, and skirt oil scraper ring. The rings are made from high-quality, heat-resistant materials that are designed to minimize friction, maximize compression, and optimize oil control for improved engine performance and longevity.

The piston crown is finished with a precise honing process to ensure a perfect fit with the engine cylinder. This attention to detail ensures optimal combustion chamber sealing, resulting in improved engine efficiency and power output.

Additionally, the SPI 09-803N piston comes with a matching wrist pin and piston pin to ensure proper alignment and smooth operation. These components are also made from high-strength materials to ensure long-lasting performance.

In conclusion, the SPI 09-803N piston is a top-quality replacement option for Yamaha outboard engines used on the 1973 GP338, 1974 SL338, and 1976-77 GS340 models. Its forged aluminum alloy construction, advanced ring package, and meticulous attention to detail make it an ideal choice for those seeking optimal engine performance and longevity.

Buying a SPI 09-803N piston for Yamaha GP338 (1973), SL338 (1974), and GS340 (1976-77) 60mm engines comes with several pros and cons that can help you make an informed decision.

1. OEM Replacement: The SPI 09-803N piston is an original equipment manufacturer (OEM) replacement part, meaning it is designed and manufactured to the same specifications as the original piston in your Yamaha engine. This ensures proper fitment and reliability.

2. Improved Engine Performance: A new piston can help improve engine performance by reducing compression leakage and improving combustion efficiency. This can lead to better fuel economy and increased horsepower.

3. Longer Engine Life: By replacing a worn or damaged piston, you can help extend the life of your engine and avoid more costly repairs in the future.

4. Better Than Aftermarket: An OEM replacement piston like the SPI 09-803N is typically superior to aftermarket alternatives due to its precise manufacturing and fitment. This can help prevent potential issues such as engine damage or poor performance.

1. Cost: An OEM replacement piston can be more expensive than aftermarket alternatives. However, the increased cost may be worth it for the improved reliability, fitment, and performance.

2. Availability: Depending on the specific engine model and availability, it may take some time to source an OEM replacement piston. This could result in downtime for your watercraft.

3. Installation: Installing a new piston can be a complex process and may require specialized tools and knowledge. It is recommended that the installation be performed by a certified Yamaha technician or a professional mechanic to ensure proper installation and prevent potential damage to the engine.

When deciding whether to buy an SPI 09-803N piston for your Yamaha GP338, SL338, or GS340 60mm engine, consider the benefits of an OEM replacement part, including improved engine performance, longer engine life, and superior fitment and reliability, despite the potential costs and availability challenges. Ultimately, the investment in a high-quality OEM replacement part can help save you time and money in the long run by preventing more costly repairs and ensuring optimal engine performance.

If you are in need of a new piston for your Yamaha watercraft, we highly recommend investing in an OEM replacement part such as the SPI 09-803N piston to ensure proper fitment, reliability, and engine performance. Although it may come with a higher cost and potential availability challenges, the benefits of an OEM replacement part ultimately outweigh the cons. It's important to consult your Yamaha dealer or a certified technician for proper installation and availability information.

Details:

Includes: 2 pistons, ring sets, wrist pins cir clips. All pistons, rings, pins and cir clips are manufactured to OEM specifications. Manufactured by SPI. Pistons are for standard bore size 60.00mm.

OEM piston kits. Compatible with Yamaha model's below: 1973 GP338. Piston weight compatible with original piston. Made in Taiwan.

part #: 09803n prices

• $19.99-$72.99

specifications enginesnowmobile:

• for models: Gs340
• for makes: Yamaha
• for years: 1973-1976-77
• brand: Spi
• mpn: 09-803n
• part type: Piston

shipping enginesnowmobile:

• type: Fixed
• service: Standard
• class: Standard
• cost: $0.00
• transit: 5-10 Days

general enginesnowmobile:

• Snowmobile Parts > Engines Components > Snowmobile Engine Components
• condition: New

offer enginesnowmobile:

• options: Ship-to-home
• started: August 29, 2025
• quantity: 2
• sold: 0
• availability: In Stock

payments enginesnowmobile:

• other
• wallet: Paypal
• credit card: Visa

returns enginesnowmobile:

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

seller enginesnowmobile:

• rating: 99.3%
• city: Suamico, Wisconsin
• # reviews: 388266

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