00428 YAMAHA Cylinder Middle Power Valve Compression GP1200R

Review YAMAHA Cylinder #2 Middle 67x Oem Power Valve Good Compression for GP1200R 1200

The Yamaha GP1200R WaveRunner is a high-performance personal watercraft (PWC) that delivers an exhilarating riding experience. At its heart is a powerful and efficient 1200cc, 4-stroke, 12-valve, DOHC, inline three-cylinder engine. This middle cylinder, specifically, is identified as part number 00428, and it plays a crucial role in generating the impressive power and torque that this watercraft is renowned for.

Measuring 67mm in bore and 1200cc in displacement, this cylinder is designed to provide exceptional power output with excellent fuel efficiency. The engine's advanced design includes a power valve system that optimizes intake and exhaust port timing for improved power and torque across the entire RPM range. The compression ratio is finely tuned to ensure that the engine runs efficiently and cleanly, providing excellent performance and longevity.

The cylinder is constructed from high-strength materials, including a forged piston and a high-performance cylinder liner. These components are engineered to provide superior durability and reliability, even under the demanding conditions of high-speed water riding. The cylinder head features sophisticated porting and combustion chamber design, optimized for efficient fuel-air mixture preparation and ignition.

The GP1200R engine is also equipped with advanced features such as electronic fuel injection, which ensures precise fuel delivery for optimal engine performance and reduced emissions. The engine is also equipped with a wet sump lubrication system, which provides ample oil capacity and cooling to ensure the engine runs smoothly and efficiently.

Overall, the middle cylinder of the Yamaha GP1200R engine is a critical component that contributes to the watercraft's impressive power, torque, and efficiency. Its advanced design, high-performance materials, and sophisticated engineering make it a standout feature of this high-performance PWC.

Pros and Cons of Buying a Yamaha GP1200R Cylinder Middle (67x1200, Power Valve Compression)

The Yamaha GP1200R is a high-performance jet ski known for its power, agility, and durability. However, like any engine component, the cylinder middle (67x1200, power valve compression) may require replacement due to wear or damage. In this analysis, we will discuss the advantages and disadvantages of purchasing a new Yamaha GP1200R cylinder middle.

1. Improved Engine Performance: A new cylinder middle ensures optimal engine compression, which leads to better combustion and increased power output. This results in improved acceleration and top speed.

2. Enhanced Fuel Efficiency: A well-maintained engine runs more efficiently, consuming less fuel. A new cylinder middle is a crucial component in maintaining engine efficiency.

3. Longer Engine Life: Replacing a worn-out cylinder middle can help extend the life of the engine by preventing further damage and potential engine failure.

4. Smoother Ride: A new cylinder middle can help reduce engine vibrations and improve overall ride quality.

1. Cost: The cost of a new Yamaha GP1200R cylinder middle can be quite substantial, especially for those on a budget.

2. Installation Complexity: Installing a new cylinder middle requires specialized tools and knowledge. It may be necessary to hire a professional mechanic for installation, increasing overall costs.

3. Potential for OEM vs Aftermarket Debate: Deciding between an Original Equipment Manufacturer (OEM) and aftermarket cylinder middle can be a challenge. While OEM parts offer the benefit of being manufactured by the original manufacturer, aftermarket parts may be more cost-effective and readily available.

The decision to buy a new Yamaha GP1200R cylinder middle ultimately depends on various factors, including budget, desired performance improvements, and personal preference for OEM vs aftermarket parts. While the investment in a new cylinder middle may seem significant, the potential benefits in engine performance, fuel efficiency, extended engine life, and ride quality can make it a worthwhile investment for dedicated jet ski enthusiasts.

If you are an avid jet ski user looking to maximize performance and engine life, investing in a new Yamaha GP1200R cylinder middle is recommended. However, for those on a tight budget or looking for a more cost-effective solution, considering aftermarket options or rebuilding the existing cylinder middle may be viable alternatives. Always consult with a qualified mechanic or Yamaha dealer for professional advice on your specific situation.

Details:

Used oem cylinder in good condition. Oem Yamaha cylinder #2 middle cylinder removed from a 1999 2005 GP1200R / 67x engine. Compatible model's typical 67x 1200 engines previously had good compression when removed.

specifications watercraftimp:

• for models: Gp1200r, 1200
• brand: Yamaha
• mpn: 00428
• part type: Valve Cylinder Compression

returns watercraftimp:

• policy: no returns

offer watercraftimp:

• prices: $37.95–$86.95
• item condition: New
• best offers: true
• sold #: 5
• availability: in stock
• in stock #: 5
• started: april 30, 2026
• options: ship-to-home

seller watercraftimp:

• rating: 100.0%
• city: atwater, california
• # reviews: 8

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• transit: 5-11 days
• class: standard
• service: usps ground advantage
• carrier: usps
• type: calculated

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• category: Watercraft Parts > Engines > Impellers Components

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