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WSM 100-125-04PK Piston Kit 3.685 Bore Port Side .010 Oversize OMC Johnson Evinrude

Manufacturer

WSM

<h3>About WSM Performance Parts</h3><p>WSM Performance Parts has built a strong reputation among powersports enthusiasts as a go-to source for <strong>quality replacement parts</strong> across a wide range of recreational vehicles. Based in Bohemia, New York, WSM specializes in parts for personal watercraft (PWC), marine vessels, all-terrain vehicles (ATV), utility task vehicles (UTV), and dirt bikes — making them a versatile, one-stop brand for anyone who loves getting out on the water or hitting the trails.</p><p>With a catalog spanning hundreds of part numbers, WSM is committed to delivering OEM-compatible components that meet or exceed original equipment standards. Whether you&apos;re rebuilding a jet pump on a Sea-Doo, refreshing an outboard motor, or restoring performance to an aging ATV, WSM offers the parts to get the job done right. Their mission is straightforward: provide the highest quality parts on the market at reasonable prices — a philosophy that has earned them a loyal following among weekend riders and professional mechanics alike.</p><h3>Why Powersports Enthusiasts Trust WSM</h3><p>WSM&apos;s strength lies in the depth and breadth of their product coverage. Their catalog includes everything from piston kits and gasket sets to fuel filters, shift cable bellows, jet pump repair kits, and engine rebuild components. Products are engineered to fit a wide array of popular brands including Yamaha, Sea-Doo, Kawasaki, Mercury, Suzuki, and many more, ensuring that finding the right part for your specific application is straightforward.</p><ul style="list-style:disc"><li><strong>Wide Vehicle Coverage:</strong> Parts for PWC, marine outboards, ATVs, UTVs, and dirt bikes all under one brand.</li><li><strong>OEM Compatibility:</strong> WSM parts are cross-referenced to original equipment numbers, simplifying the parts-matching process.</li><li><strong>Quality Assurance:</strong> Each product is designed to restore factory-level performance and reliability.</li><li><strong>Accessible Pricing:</strong> Performance-grade replacement parts without the premium markup of dealership pricing.</li></ul><h3>WSM Product Categories</h3><p>From jet pump rebuild kits for personal watercraft to engine components for off-road machines, WSM&apos;s catalog is designed to support serious maintenance and performance restoration. Riders who demand dependable parts — whether for a weekend trip on the lake or a full engine overhaul — will find WSM&apos;s lineup a reliable resource. Explore their <a href="/5555-wsm-automatic-transmission-master-repair-kit-7772">Automatic Transmission Master Repair Kits</a> and other drivetrain solutions available in their catalog.</p>

Part Number

100-125-04PK
09/12/2036 3:46 AM
Sale Price

$81.56

3 left at this price

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The WSM 100-125-04PK is a high-quality port side piston kit designed for OMC Johnson/Evinrude loop-charged outboard motors with a 3.685" bore. This kit features a .010" (.25mm) oversize piston, ideal for engine rebuilds where cylinders have been bored to restore performance and compression.

Key Features:

  • Port side piston kit for OMC loop-charged outboards
  • 3.685" bore size with .010" oversize specification
  • Competitively priced forged piston construction
  • MOS2 coating for enhanced performance and heat absorption
  • Complete kit includes piston, rings, wrist pin, and clips
  • Manufactured to meet or exceed OEM specifications

This piston kit is specifically designed for the port cylinder position in OMC Big Bore Looper engines. WSM pistons are precision-engineered using quality materials and advanced manufacturing processes to deliver reliable performance and durability in demanding marine environments. The MOS2 coating reduces friction and improves heat dissipation, extending piston life while maximizing power output.

Note: This is a port side kit. Ensure you select the correct side (port or starboard) for your engine rebuild. For complete engine rebuilds, matching starboard side pistons are available separately.

Easy to place order

Looks like what I want . . . we'll see. Hope it is what was pictured. In any case, the order process was smooth and easy. Best price I could find too.

Good prices, but it was hard for the check out...

insufficient info presented. Before confirming payment needed to make sure part fit proper side. Info not provided had to call in waited ten minutes. Also when choosing paypal payment it wouldn't transfer. had to log off twice before final completion.

Great

Very easy

good

That was quick, thanks for the Amazon option.

easy shopping, I have my truck in the shop and waiting for the part

Very low price, fast shipping, good customer service. Product perfectly fit my needs and saved me time and money. Recommend!!!

So far so good

great prices and customer service was very helpful.

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