421000657 SEA-DOO Rotax Supercharged Engine Rxt

Review SEA-DOO Seadoo Rotax Supercharged Engine Hours for SEA-DOO RXT 1989–2009

Introducing the 2009 Sea-Doo RXT 255, powered by the advanced Rotax 1503 Supercharged engine with the part number 421000657. This high-performance watercraft engine is designed to deliver impressive power and acceleration, making your time on the water an unforgettable experience.

The Rotax 1503 engine is a supercharged, four-stroke, triple-cylinder powerhouse that produces an impressive 255 horsepower. With its supercharger, this engine provides a consistent and powerful wave of torque, ensuring responsive acceleration and exhilarating top speeds.

This engine is not only powerful but also efficient, featuring Sea-Doo's closed-loop cooling system. This system circulates the engine's cooling water through a heat exchanger, which in turn uses the watercraft's waste heat to keep the engine running cool and efficiently.

The Rotax 1503 engine is also designed with durability in mind, featuring a compact design that reduces weight and increases power-to-weight ratio. Its precision-machined components, including the crankshaft, camshaft, and connecting rods, ensure reliable performance even in the most demanding conditions.

The 2009 Sea-Doo RXT 255's engine also features an advanced electronic fuel injection system, which delivers the exact amount of fuel needed for optimal combustion and maximum power output. This system also ensures smooth and consistent throttle response, providing a seamless riding experience.

The 421000657 engine is also compatible with Sea-Doo's iBR (Intelligent Brake and Reverse) system, which allows you to easily maneuver in reverse and apply the brakes for added safety and convenience. This system uses a fly-by-wire throttle control that integrates with the engine's electronic fuel injection system to provide precise and responsive control.

In summary, the 2009 Sea-Doo RXT 255's Rotax 1503 Supercharged engine, part number 421000657, is a high-performance, efficient, and durable powerplant that delivers impressive power and acceleration for an unforgettable time on the water. Its advanced features, including electronic fuel injection, supercharging, and closed-loop cooling, ensure reliable and consistent performance, making it an excellent choice for any watercraft enthusiast.

The Sea-Doo RXT 255 is a high-performance personal watercraft (PWC) equipped with a supercharged Rotax 1503 engine. Here are some pros and cons of buying this specific model, the 2009 Sea-Doo RXT 255 with the 89 series engine (model number 421000657).

1. Power: The supercharged Rotax 1503 engine delivers impressive power and acceleration, making for an exhilarating riding experience.

2. Handling: The RXT 255 is known for its agile handling, allowing riders to easily maneuver through turns and navigate tight spaces.

3. Storage: This model offers ample storage space for gear and supplies, including a large bow storage compartment, a rear cargo bin, and a waterproof glove box.

4. Comfort: The RXT 255 features a comfortable and ergonomic saddle design, adjustable footrests, and a reboarding step for easy entry and exit.

5. Features: This model comes with various features such as a multi-function digital gauge, a stereo system, and a reboarding ladder.

1. Fuel Efficiency: Supercharged engines generally consume more fuel than naturally aspirated engines, which can lead to higher operating costs.

2. Maintenance: Supercharged engines may require more frequent maintenance than naturally aspirated engines due to the added complexity of the supercharger system.

3. Noise: The supercharger can generate more noise than a naturally aspirated engine, which may not be desirable for all users.

4. Price: The RXT 255 is a high-performance PWC and comes with a premium price tag.

The 2009 Sea-Doo RXT 255 with the 89 series engine is an excellent choice for those seeking a high-performance personal watercraft with impressive power, agile handling, and ample storage space. However, it comes with some drawbacks such as higher fuel consumption, increased maintenance requirements, and a premium price tag. Ultimately, the decision to buy this model depends on your personal preferences, budget, and riding style.

If you are looking for a high-performance personal watercraft and are willing to accept the higher fuel consumption, maintenance requirements, and premium price tag, then the 2009 Sea-Doo RXT 255 with the 89 series engine is an excellent choice. However, if you are on a tighter budget or prefer a more fuel-efficient and low-maintenance option, you may want to consider other models in the Sea-Doo lineup or from other manufacturers.

Details:

Cylinder head is very clean and all valves look great. Block is missing some paint as most are. Original part number is 421000657, superseded 420150394. I pulled the PTO cover to make sure oil supply nozzle was injecting in middle of supercharger shaft and also inspect.

specifications watercraftimp:

• for models: Rxt
• for makes: Sea-doo
• for years: 1989–2009
• mpn: 421000657
• part type: Engine
• country of origin: Austria

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• other
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• credit card: discover

offer watercraftimp:

• options: seller-arranged-local-pickup
• price: $3300.00
• item condition: Used
• best offers: true
• started: april 25, 2026
• in stock #: 1
• availability: in stock
• sold #: 9

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• rating: 100.0%
• city: port jefferson station, new york
• # reviews: 697

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• category: Watercraft Parts > Engines, Impellers Component > Complete

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• policy: no returns