100-21SK WSM Piston Sportjet Starboard Standard Mercury

Review WSM Piston Mercury/mariner Hp 2.5l Sportjet Starboard Standard for MERCURY MARINER 1997–2006

The WSM 100-21SK is a high-performance, piston-style impeller for Mercury and Mariner outboard motors with a 175-250 horsepower rating and a 2.5-liter SportJet engine, manufactured by Water Sports Manufacturing (WSM) between 1997 and 2006 for starboard applications. This impeller is designed for use in personal watercraft and high-performance boats, delivering impressive power and efficiency.

The WSM 100-21SK impeller features a 10-blade design, which allows for a balanced and efficient water flow through the pump. Each blade is meticulously crafted from a durable, corrosion-resistant material, ensuring longevity and reliability. The blades are also optimized for a wide operating range, enabling the impeller to perform effectively in various water conditions.

The impeller's hub is engineered to fit securely within the pump housing and is designed to minimize turbulence, ensuring a smooth water flow. The hub is also equipped with a high-quality, O-ring seal to prevent water leakage and maintain the integrity of the system.

The WSM 100-21SK impeller is specifically designed for Mercury and Mariner 175-250 horsepower 2.5-liter SportJet engines, ensuring a perfect fit and optimal performance. This impeller is an excellent upgrade for those seeking higher power output, improved efficiency, and enhanced water sports capabilities.

Installation of the WSM 100-21SK impeller is a straightforward process, and it is compatible with various aftermarket high-performance pumps. Its high-quality construction and durable materials make it an ideal choice for those who demand the best from their watercraft engines.

In summary, the WSM 100-21SK is a top-performing, piston-style impeller for Mercury and Mariner 175-250 horsepower 2.5-liter SportJet engines, manufactured between 1997 and 2006 for starboard applications. Its 10-blade design, durable materials, and optimized blade shape deliver balanced water flow and impressive power output, making it an excellent choice for those seeking high-performance water sports capabilities.

The Mercury/Mariner 175-250 HP 2.5L WSM 100-21SK SportJet outboard motor is a popular choice for those in need of a powerful, reliable, and versatile outboard engine. Here are some pros and cons to help you make an informed decision about purchasing this engine:

1. Power: This engine delivers a significant amount of power, making it suitable for larger boats and those who require high-performance capabilities.

2. Fuel Efficiency: The 2.5L engine is known for its impressive fuel efficiency, which can help save money on operating costs over time.

3. Durability: Mercury Marine is known for producing high-quality, durable outboard engines, and the 175-250 HP 2.5L WSM is no exception.

4. Versatility: This engine is suitable for a wide range of boats and water activities, including fishing, water sports, and cruising.

5. Reliability: Mercury Marine engines are known for their reliability, which can provide peace of mind for boat owners.

1. Cost: This engine is on the pricier side, which may be a disadvantage for those on a tight budget.

2. Weight: At around 670 pounds, this engine is heavier than some other options, which may require additional reinforcement on smaller boats.

3. Complexity: This engine is more complex than some other outboard options, which may require more maintenance and upkeep.

4. Limited Availability: This engine may not be as widely available as some other options, which could limit the options for repair and replacement parts.

In conclusion, the Mercury/Mariner 175-250 HP 2.5L WSM 100-21SK SportJet outboard motor offers significant power, impressive fuel efficiency, durability, versatility, and reliability. However, it also comes with a higher cost, greater weight, increased complexity, and limited availability.

If you require high-performance capabilities and are willing to invest in a powerful, efficient, and reliable engine, then the Mercury/Mariner 175-250 HP 2.5L WSM 100-21SK SportJet outboard motor may be the right choice for you. However, if you are on a tight budget, have a smaller boat, or prefer a simpler and more widely available engine, then you may want to consider other options. Ultimately, the decision depends on your specific needs and preferences.

Details:

Notes from Wsm ported to match banshee sleeves.: competitively priced forged pistons. Coated with mos2 for high performance and heat absorption. Wsm piston kit w/ rings for.

Starboard-side piston, standard bore. I bought this piston for my 2000 Mercury 240 efi sportjet rebuild, only to find out engine had oversized pistons this one sale is standard bore size. Oem replacement numbers: 39-841089t1, 785-854687a11, 785-854687a7, 785-9738t11, 854687a11, 854687a7, 854687t2. This product is distinguished by total quality assurance, unsurpassed anybody else.

Piston pin is 5mm higher on long rod pistons to accommodate. This piston is new never installed in original box includes rings installed, wrist pin and cir clips.

specifications watercraftimp:

• for models: Mariner
• for makes: Mercury
• for years: 1997–2006
• brand: Wsm
• mpn: 100-21sk
• part type: Hp Piston
• image note: Image Is For Reference Only, Actual Product May Vary Slightly.
• ships from: Usa
• oem or performance: Performance/aftermarket
• vendor: Lionparts Powersports
• upc: 865369024742
• handling time: Approximately 2 Business Days

shipping watercraftimp:

• carrier: usps
• type: calculated
• class: standard
• service: usps ground advantage
• transit: 3-8 days

returns watercraftimp:

• policy: no returns

general watercraftimp:

• category: Watercraft Parts > Engines > Impellers Components

payments watercraftimp:

• other
• credit card: diners-club
• wallet: apple-pay

offer watercraftimp:

• in stock #: 5
• prices: $100.00–$124.21
• item condition:
  • Used
  • New
• availability: in stock
• options: ship-to-home
• started: march 17, 2026
• sold #: 9

seller watercraftimp:

• # reviews: 941
• rating: 100.0%
• city: spokane, washington