YAMAHA 4EW-11631-01-B0 Nos Piston

( Manufacturer Part Number: 4EW-11631-01-B0 ), ( Type: Piston ), ( Machine Type: Off-road Motorcycle ), ( Country/region Of Manufacture: Japan )

Review YAMAHA New Nos Oem Piston 93-95 fits YZ250 WR250 STD 1994–1997

The Yamaha 4EW-11631-01-B0 NOS (New Old Stock) standard piston is designed specifically for the Yamaha YZ250 and WR250 motorcycles manufactured between 1993 and 1995. This piston is a crucial engine component that undergoes significant pressure and heat during operation, making it essential for optimal engine performance and longevity.

The piston features a compact design that contributes to the bike's overall agility and power delivery. It is constructed using high-quality forged aluminum alloy, ensuring both strength and lightness. The piston's crown is machined with a dish shape, optimizing the combustion chamber volume for efficient power transfer.

The piston ring package includes a compression ring, an oil control ring, and a skirt oil scraper ring. These rings are designed to maintain a proper seal between the piston and the cylinder wall, ensuring optimal compression and controlling oil consumption.

The piston's pin bore is precision-machined to ensure a snug fit with the connecting rod. This connection is critical for efficient power transfer from the piston to the crankshaft. The piston also comes with a matching piston pin and wrist pin bushings for a smooth operation.

The Yamaha 4EW-11631-01-B0 NOS standard piston is an excellent replacement option for worn-out or damaged pistons in your Yamaha YZ250 or WR250. By installing this authentic, new piston, you can restore your bike's engine to its original performance and ensure many more miles of enjoyable riding.

Buying a Yamaha 4EW-11631-01-B0 standard piston for models like YZ250 (1993-1995) and WR250 (1994-1997) comes with several pros and cons. Here's a breakdown of each:

1. Improved Performance: A standard piston can help increase power and torque, resulting in better overall performance. This can be particularly noticeable in high-revving engines.

2. Customizability: Replacing the stock piston with a high-performance one can be a cost-effective way to customize your motorcycle and potentially improve its racing capabilities.

3. Durability: Aftermarket pistons are often made from stronger materials and can withstand more pressure, which can lead to increased engine life and reliability.

1. Cost: Aftermarket pistons can be more expensive than stock pistons. The cost of the Yamaha 4EW-11631-01-B0 piston may not be a significant investment for professional racers or serious enthusiasts, but it might be a considerable expense for casual riders.

2. Complexity: Installing a new piston involves disassembling the engine and performing a rebuild. This process can be time-consuming and requires a certain level of mechanical expertise.

3. Risk: There's always a risk involved when making modifications to an engine. Installing a high-performance piston could potentially lead to engine damage if not installed correctly or if the engine is not properly tuned.

The decision to buy a Yamaha 4EW-11631-01-B0 standard piston ultimately depends on your riding style, goals, and budget. If you're a casual rider, the cost and complexity of the installation process might not be worth it. However, if you're a serious enthusiast or racer, the potential performance gains and increased durability could make the investment worthwhile.

If you're considering purchasing this piston, make sure to do thorough research on the installation process and consult with a professional mechanic or experienced rider to ensure the modification is performed correctly and safely. Additionally, consider the cost of the piston in relation to your overall budget and riding goals to determine if it's a worthwhile investment for you.

Details:

part #: 4ew1163101b0 prices

• $76.44-$291.76

specifications pistondon:

• for models: Yz250, Wr250, Std
• for makes: Yamaha
• for years: 1994-1997
• mpn: 4ew-11631-01-b0
• type: Piston
• machine type: Off-road Motorcycle
• country/region of manufacture: Japan

seller pistondon:

• city: Cumberland, Rhode Island
• rating: 100.0%
• # reviews: 4757

offer pistondon:

• started: August 26, 2025
• availability: In Stock
• quantity: 1
• best offers: True
• sold: 0
• options: Ship-to-home

shipping pistondon:

• class: Standard
• cost: $5.00
• type: Fixed
• service: Standard
• transit: 3-9 Days

payments pistondon:

• other
• credit card: Visa
• wallet: Apple-pay

general pistondon:

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

returns pistondon:

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

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