STENS 515-UNKNOWN Piston Wrist Pin 65MM 2.559 47.80MM 1.882 P3899

( Brand: Stens ), ( Manufacturer Part Number: 515-UNKNOWN ), ( Part Type: Piston Pin ), ( Country Of Origin: Taiwan ), ( Wrist Pin Inches: .498 ), ( Piston Diameter Metric: 65mm ), ( Piston Diameter Inches: 2.559 ), ( Piston Height Metric: 47.80 ), ( Piston Height Inches: 1.882 ), ( Wrist Pin Metric: 12.66 )

Review STENS Piston Diameter 65mm 2.559 Inch Height 47.80mm 1.882 Includes Wrist Pin

The STENs 515 Unknown Piston is a crucial component in the functioning of internal combustion engines, specifically those with a 65mm bore size. This piston, with a part number of P3899, is designed to fit engines with a stroke length of 2.559 inches (65mm) and a pin diameter of 1.882 inches (47.80mm). It is essential to note that the "unknown" in the product name refers to the engine make and model this piston is intended for, as STENs produces pistons for various applications.

This piston is characterized by its robust design and high-quality materials. Its piston crown is engineered to provide efficient combustion and optimal power output. The piston skirt is designed to ensure a perfect seal within the engine cylinder, minimizing the loss of compression and enhancing the overall engine performance.

The piston pin, which is 2.559 inches long (65mm), plays a critical role in connecting the piston to the connecting rod. Its diameter is 1.882 inches (47.80mm), ensuring a secure fit and proper functioning of the piston assembly. The piston pin is also designed to withstand the high temperatures and pressures encountered during engine operation.

In summary, the STENs 515 Unknown Piston (P3899) is a high-performance piston engineered to fit engines with a 65mm bore and a stroke length of 2.559 inches. Its robust design, efficient combustion, and secure connection to the connecting rod make it an essential component for any internal combustion engine. If you require a piston for a specific engine make and model, it is recommended to consult the manufacturer or a knowledgeable engine professional for the appropriate part number.

The Stens 515-unknown piston with part numbers 65mm, 2.559, 47.80mm, and 1.882 (wrist pin P3899) is a replacement piston used in various small engines, primarily air-cooled lawn mowers and other garden equipment. Let's discuss the pros and cons of purchasing this piston to help you make an informed decision.

1. OEM (Original Equipment Manufacturer) Quality: Stens is a well-known supplier of OEM parts, ensuring a good fit and reliable performance.

2. Affordable: Compared to buying a new engine or even a rebuilt one, replacing just the worn-out piston can save significant money in the long run.

3. Easy Installation: With the right tools and instructions, the piston can be replaced by an average DIYer.

4. Improved Engine Performance: A new piston can result in a more efficient engine, leading to better fuel economy and reduced emissions.

1. Potential for Wear and Tear on Other Parts: As the piston wears out, other engine parts may also need to be replaced, increasing overall repair costs.

2. Risk of Damaging Other Parts During Installation: Improper installation of the new piston can lead to damage to the engine's crankshaft, connecting rod, or cylinder wall.

3. Limited Life Span: While a new piston can restore engine performance, it will eventually wear out again and require another replacement.

In conclusion, buying the Stens 515-unknown piston with the given part numbers can be a cost-effective solution for restoring engine performance in your small engine equipment. However, be aware of the potential need for additional repairs and the limited lifespan of the piston. To minimize the risk of damaging other engine parts, consider having the piston installed by a professional technician.

Recommendation: If you're confident in your DIY skills and have the necessary tools, purchasing and installing the Stens 515-unknown piston can be a good option for restoring engine performance in your small engine equipment. However, if you're unsure about the installation process or suspect other engine parts might be worn out, consider having a professional technician inspect and repair your engine.

Details:

part #: 515-unknown price

• $19.94

specifications pistondon:

• brand: Stens
• mpn: 515-unknown
• part type: Piston Pin
• country of origin: Taiwan
• wrist pin inches: .498
• piston diameter metric: 65mm
• piston diameter inches: 2.559
• piston height metric: 47.80
• piston height inches: 1.882
• wrist pin metric: 12.66

general pistondon:

• condition: New other see details
• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits

seller pistondon:

• # reviews: 6271
• rating: 99.9%
• city: Spokane, Washington

returns pistondon:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

payments pistondon:

• credit card: Diners-club
• wallet: Paypal
• other

shipping pistondon:

• class: Standard
• type: Fixed
• transit: 4-7 Days
• cost: $0.00
• service: Standard

offer pistondon:

• best offers: True
• options: Ship-to-home
• availability: In Stock
• sold: 0
• quantity: 1
• started: February 7, 2026

Stens P3899 Is Similar To:

• Stens 500-736 Standard Piston Ring Kit Nos (29.2% similar) All parts are in stock and ready to ship. If the original package is included it may show signs of wear. Pictures: thumbnails. Standard piston ring kit nos. Items are shipped using USPS, ups, and FedEx. Standard piston ring kit is new and in excellent condition, original packaging...(February 28th, 2026)