YAMAHA 109-11636-00-00 Nos Piston Ahrma 401-00637-00-00 40MM YF1 50CC

( Machine Type: Street Motorcycle ), ( Piston Diameter: 40mm ), ( Material: Aluminum Alloy, Steel ), ( Vintage Part: Yes ), ( Engine Type: 2-stroke ), ( Type: Piston ), ( Oe/oem Part Number: 109-11636-00-00 ), ( Pin Diameter: 12mm ), ( Country Of Origin: Japan ), ( UPC: 109116360000 )

Review YAMAHA Nos Piston 40mm Size Yf1 50cc Vintage Ahrma fits STD

The Yamaha 401-00637-00-00 NOS (New Old Stock) Standard 40mm Piston is specifically designed for the Yamaha YF1 50cc engine, model years 109-116. This piston is a replacement part for those in need of a upgrade or repair.

This piston features a standard 40mm diameter and is designed to deliver optimal performance for the YF1 50cc engine. The piston is made from high-quality materials, ensuring durability and reliability even under heavy usage. The piston skirt is designed to provide a tight seal within the engine cylinder to minimize gas leakage and maximize power transfer.

The piston ring grooves are precisely machined to accommodate the corresponding piston rings, ensuring proper sealing and compression. The piston crown is designed to provide efficient combustion, allowing for maximum power output from the engine.

This AHRMA (American Historic Racing Motorcycle Association) approved piston is ideal for vintage racing enthusiasts and collectors who want to maintain the authenticity of their Yamaha YF1 50cc engine while also improving its performance. The NOS status of the piston ensures that it is an original, unopened part straight from the manufacturer, ensuring the highest level of quality and authenticity.

In summary, the Yamaha 401-00637-00-00 NOS Standard 40mm Piston is a high-quality replacement part designed for the Yamaha YF1 50cc engine, model years 109-116. It is made from durable materials, features precise machining, and is approved by AHRMA. This piston is an excellent choice for those looking to upgrade or repair their engine while maintaining its authenticity.

A Detailed Analysis of Buying Yamaha 401-00637-00-00 and 11636-00-00 AHRMA Pistons for a YF1 50cc Engine

The Yamaha 401-00637-00-00 and 11636-00-00 AHRMA pistons are aftermarket performance parts designed for the YF1 50cc engine. These pistons offer potential improvements in power, durability, and performance. In this analysis, we will discuss the pros and cons of buying these pistons to help you make an informed decision.

1. Enhanced Power: These pistons are designed to provide increased power output by optimizing the combustion process.

2. Improved Durability: The pistons are made from high-quality materials, ensuring longer engine life and better resistance to wear and tear.

3. Increased Performance: The pistons offer improved combustion efficiency, resulting in better fuel economy and increased engine performance.

4. Race-Proven Design: AHRMA is a renowned organization in the motorcycle racing community, and their pistons are designed and tested for high-performance applications.

1. Cost: These pistons are more expensive than the stock pistons, which could be a significant investment for some riders.

2. Installation Complexity: Installing aftermarket pistons requires specialized knowledge and tools, which might necessitate the assistance of a professional mechanic.

3. Potential Compatibility Issues: Ensure that these pistons are compatible with your specific YF1 50cc engine before making a purchase.

The Yamaha 401-00637-00-00 and 11636-00-00 AHRMA pistons offer numerous benefits, including enhanced power, improved durability, and increased performance. However, they come with a higher cost, installation complexity, and potential compatibility issues. Ultimately, the decision to purchase these pistons depends on your budget, riding style, and performance goals. If you're looking for significant power gains and are willing to invest in a high-quality aftermarket part, these pistons could be an excellent choice.

If you're considering purchasing the Yamaha 401-00637-00-00 and 11636-00-00 AHRMA pistons, we recommend doing thorough research on their compatibility with your specific YF1 50cc engine and consulting a professional mechanic for installation. Additionally, carefully consider the potential benefits and drawbacks to determine if these pistons align with your riding style and performance goals.

Details:

LOL Do your homework. Please e-mail with questions. As is and shown with no factory warranty on it. Not for the avg.

NLA FROM YAMAHA, THESE ARE ALMOST NON-EXISTING AND RARELY OFFERED IN 1 PERFECT PIECE LIKE THIS. You don't see this everyday. Sorry, no zero buyers. You know you've found a deal where saving money comes easily.

FOR ONLY 19.95. Joe, but someone who loves and races or restores these bikes. THIS has not seen daylight for a long time. 109-11636-00-00: still in factory wrapping, UNLIKE OTHER CHINESE JUNK KITS, A MUST TO REPLACE WHEN DOING TOP END CHANGE, COMES WITH EVERYTHING PICTURED.

PARTS SEARCH RESULTS: ASSEMBLIES WHERE 109-11636-00-00 IS USED: 1964-1965 YAMAHA YF1 STD OEM PISTON. If you are that person, salivating like hell right now.

part #: 109116360000 prices

• $19.95-$29.95

specifications pistondon:

• for models: Std
• for makes: Yamaha
• machine type: Street Motorcycle
• piston diameter: 40mm
• material: Aluminum Alloy, Steel
• vintage part: Yes
• engine type: 2-stroke
• type: Piston
• oe/oem part number: 109-11636-00-00
• pin diameter: 12mm
• country of origin: Japan
• upc: 109116360000

payments pistondon:

• cash
• credit card: Mastercard
• other
• wallet: Paypal

offer pistondon:

• started: January 10, 2026
• options: Ship-to-home
• availability: In Stock
• sold: 0
• quantity: 1

returns pistondon:

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

seller pistondon:

• city: Appleton, Wisconsin
• rating: 98.2%
• # reviews: 7401

shipping pistondon:

• cost: $0.00
• class: Economy
• service: Economy
• type: Fixed
• transit: 3-6 Days

general pistondon:

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

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