LY972840MC WSM Overbore Piston Kit Spx Sea-doo

Review WSM Overbore Piston Kit .75mm Over 76.75mm Sea Doo for SEA-DOO SPX 1993

The WSM Ly972840MC Overbore Piston Kit is a high-performance upgrade designed specifically for the Sea-Doo SPX 93 model with a 75mm (bore) and 76.75mm (stroke) engine. This kit is an excellent choice for those looking to increase power and torque in their watercraft.

The pistons in this kit are made from a high-strength, forged aluminum alloy that is both lightweight and strong. They have been overbored to accommodate larger cylinder bores, allowing for increased displacement and, consequently, more power. The piston tops have been machined with a dish design to optimize combustion chamber volume and improve power output.

The piston rings included in this kit are made from a high-quality, nitrided steel material. Nitriding is a process that enhances the strength and durability of the rings by infusing them with nitrogen. This results in rings that can better withstand the high temperatures and pressures of the engine, ensuring a longer lifespan and improved sealing.

The piston kit also includes new piston pins, which are made from a heat-treated, chrome-molybdenum steel. These pins are precision machined and have been treated with a molybdenum coating to improve their strength and resistance to wear.

The piston kit comes with new piston pin bushings, which are made from a high-performance, composite material. These bushings provide excellent wear resistance and reduce friction between the piston pin and cylinder bore, leading to smoother engine operation and improved reliability.

The WSM Ly972840MC Overbore Piston Kit is designed to be a direct replacement for the stock pistons in the Sea-Doo SPX 93 engine. It is important to note that the installation of this kit requires the use of a professional mechanic or someone with extensive experience in marine engine rebuilds. Installation may also require additional parts, such as new cylinder sleeves or crankshaft bearings, depending on the condition of the existing components.

In summary, the WSM Ly972840MC Overbore Piston Kit is a high-performance upgrade for the Sea-Doo SPX 93 engine. It includes forged aluminum pistons that have been overbored for increased displacement, nitrided steel piston rings, heat-treated piston pins, and high-performance piston pin bushings. This kit is an excellent choice for those looking to increase power and torque in their watercraft, but it requires the expertise of a professional mechanic for installation.

Overbore piston kits, like the WSM Ly972840MC for Sea-Doo SPX 93 with a 75mm bore and 76.75mm stroke, can offer several benefits and drawbacks for your personal watercraft (PWC). Here's a brief analysis of each:

1. Increased power: An overbore piston kit enlarges the engine's bore size, allowing more fuel and air to be burned inside the cylinder, resulting in increased horsepower.

2. Improved performance: The increased power translates into better acceleration, top speed, and overall performance for your PWC.

3. Customization: Installing an overbore piston kit is a popular way to enhance the engine's output, allowing you to achieve a more personalized riding experience.

1. Cost: Overbore piston kits can be expensive, especially when considering the labor costs for installation.

2. Engine wear: Enlarging the piston bore increases the engine's stress levels, which can potentially lead to increased wear and tear, potentially requiring more frequent maintenance or replacement of other engine components.

3. Fuel consumption: The increased power demands more fuel, leading to higher operating costs and potentially decreased fuel efficiency.

An overbore piston kit like the WSM Ly972840MC can provide significant power gains and performance enhancements for your Sea-Doo SPX 93. However, these benefits come with increased costs, potential engine wear, and higher fuel consumption. Ultimately, the decision to purchase this kit depends on your personal preferences, budget, and how much additional power and performance you are seeking for your PWC.

If you are an experienced PWC rider, enjoy high-performance water sports, and have the financial resources to cover the additional costs, an overbore piston kit like the WSM Ly972840MC could be an excellent investment for you. However, if you are new to PWC riding, have a limited budget, or prefer a more economical and low-maintenance riding experience, it may be wiser to consider other upgrades or modifications.

Details:

These Wsm overbore piston kits are high-quality and feature construction that meets or exceeds oem specifications. Complete piston kit. Order one kit per cylinder. Item must be in original undamaged unopened packaging.

Stock cylinders will need to be re-bored and re-plated the appropriate size. Rings available separately. 1993 Sea-doo Spx. Any fitment provided is for us spec model's.

This kit is for cylinders that have already been overbore. Use our shipping packaging to ship back the item, do not tape label directly original manufacturers box. These kits contain one piston, a ring set, wrist pin, and improved e-clips. This kit will only fit cylinders that are overbore to the bore size listed, standard pistons available in another listing.

These piston kits are also available in the platinum series, featuring specially hardened tops and an enhanced skirt coating for increased performance longevity.

specifications watercraftimp:

• for models: Spx
• for makes: Sea-doo
• for years: 1993
• brand: Wsm
• mpn: Ly972840mc
• part type: Piston
• california prop 65 warning: Warning, And Birth Defects Or Other Reproductive Harm.
• length: 3.600
• oem piston bore size: 76 Mm
• piston over bore amount: 0.75 Mm
• piston diameter: 76.75 Mm
• package quantity: Each
• wrist pin bearing included: Yes

offer watercraftimp:

• sold #: 19
• started: july 30, 2025
• in stock #: 5
• options: ship-to-home
• availability: in stock
• prices: $38.21–$90.30
• item condition: New

shipping watercraftimp:

• type: fixed
• class: standard
• transit: 2-5 days
• service: standard

seller watercraftimp:

• rating: 98.5%
• # reviews: 20282
• city: parkersburg, west virginia

returns watercraftimp:

• paid by: seller
• time: 30 days
• policy: returns accepted

payments watercraftimp:

• wallet: google-pay
• other
• credit card: visa

general watercraftimp:

• category: Watercraft Parts > Engines > Impellers Components