YAMAHA 39W-11637-01 Nos Piston 3RD O.s. 0.75MM

( Manufacturer Part Number: 39W-11637-01 ), ( Part Type: Piston ), ( Country Of Origin: United States ), ( Manufacturer Warranty: Unspecified Length ), ( Storage Location: J8 Crp1-n Buk 63 )

Review YAMAHA Nos Oem 3rd.s. 0.75mm Piston fits YZ250 1984–1985

Introducing the Yamaha 39W-11637-01 1984-1985 YZ250 NOS (New Old Stock) 0.75mm piston. This piston is a genuine replacement part designed specifically for the Yamaha YZ250 motorcycle models produced between 1984 and 1985.

The piston is manufactured using high-quality materials that ensure durability and reliability. It features a compression height of 39mm and a diameter of 74.5mm at the piston pin boss. The compression ratio of this piston is 10.5:1, making it suitable for use with standard air-cooled two-stroke engines.

The piston skirt is designed with a full-skirted design, which helps to reduce piston slap and improve engine efficiency. The piston ring grooves are precision machined to ensure a perfect seal between the piston and cylinder wall, reducing blow-by and improving combustion efficiency.

The piston crown is designed with a flat top and a dome shape, which helps to improve power delivery and combustion efficiency. The piston also features a reinforced skirt area, which helps to increase the piston's durability and longevity.

This NOS piston is in its original unopened packaging, making it an ideal choice for collectors, restorers, or those looking to preserve the originality of their vintage Yamaha YZ250 motorcycle. It is important to note that this piston is intended for use in off-road applications only and is not suitable for use on vehicles that are registered for on-road use.

Installing this piston requires a high level of expertise and experience with two-stroke motorcycle engines. It is recommended that the installation be performed by a qualified mechanic or professional technician to ensure that the piston is installed correctly and that the engine is properly tuned for optimal performance.

In summary, the Yamaha 39W-11637-01 1984-1985 YZ250 NOS 0.75mm piston is a high-quality replacement part that is designed to provide durability, reliability, and improved performance for your vintage Yamaha YZ250 motorcycle. It is important to ensure that the installation is performed by a qualified mechanic or professional technician to ensure optimal performance and longevity.

Buying a Yamaha YZ250 1984-1985 0.75mm NOS 3rd O.S Piston: Pros, Cons, and Conclusion

The Yamaha YZ250 1984-1985 NOS (New Old Stock) 0.75mm 3rd O.S (Overhead Shell) piston is an aftermarket part for vintage motorcycle enthusiasts. This piston can offer several benefits and potential drawbacks for those considering a purchase.

1. Authenticity and Originality: A NOS piston ensures that the part is original to the motorcycle model and year, which can be a significant advantage for collectors and restorers.

2. Excellent Condition: A piston that has been stored for a long time and never used is guaranteed to be in pristine condition, making it a valuable investment for those seeking high-quality parts.

3. Potential Performance Enhancement: Depending on the motorcycle's condition and the rider's preferences, a new piston could lead to improved engine performance and reliability.

1. Cost: NOS parts like the Yamaha YZ250 1984-1985 0.75mm 3rd O.S piston can be more expensive than used or rebuilt parts due to their rarity and originality.

2. Availability: Finding the exact part you need in NOS condition may be challenging, as vintage motorcycle parts can be hard to source.

3. Compatibility: It's essential to ensure that the piston is compatible with the motorcycle's engine and other components before making a purchase.

The decision to buy a Yamaha YZ250 1984-1985 0.75mm NOS 3rd O.S piston depends on the individual's priorities and circumstances. For collectors and restorers, the authenticity and originality of the part may make the investment worthwhile. For riders seeking improved performance, a new piston could potentially lead to better engine reliability and power output. However, the higher cost and potential difficulty in sourcing the part should be carefully considered before making a purchase.

Before buying the Yamaha YZ250 1984-1985 0.75mm NOS 3rd O.S piston, ensure that it is the correct part for your motorcycle and that it fits your budget. Research various vendors to find the best price and availability. Additionally, consider seeking advice from motorcycle forums or experts to ensure that you're making an informed decision.

Details:

This is a new old stock NOS Yamaha OEM 3rd oversize 0.75mm piston, part number 39W-11637-01, for the YZ250 motocross bike. The image to watch on YouTube. Essential for engine rebuilds requiring this specific oversize. 0.75mm Piston 39W-11637-01: 1984 1985 Yamaha YZ250 NOS OEM 3rd.S.

Yamaha Cruisers. Yamaha MX / ATV. Spotlight: A Day Inside . Fits: Fits 1984 1985 Yamaha YZ250 model's.

part #: 39w1163701 prices

• $24.99-$129.85

specifications pistondon:

• for models: Yz250
• for makes: Yamaha
• for years: 1984-1985
• mpn: 39w-11637-01
• part type: Piston
• country of origin: United States
• manufacturer warranty: Unspecified Length
• storage location: J8 Crp1-n Buk 63

shipping pistondon:

• service: USPS Ground Advantage, USPS Priority Mail, FedEx 2Day, Overnight
• cost: $0.00
• class: Standard, Expedited, One-day
• type: Fixed
• transit: 3-8 Days
• carrier: USPS, FedEx

offer pistondon:

• options: Ship-to-home
• started: January 14, 2026
• availability: In Stock
• quantity: 1
• best offers: True
• sold: 0

returns pistondon:

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

seller pistondon:

• rating: 99.2%
• # reviews: 204949
• city: Odessa, Florida

general pistondon:

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

payments pistondon:

• credit card: Discover
• other
• wallet: Google-pay

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