1. Pistons, Rings & Piston Kits Products
  2. sku: 11782991074403861
  3. YAMAHA 509-11638-01

YAMAHA 509-11638-01 Nos Piston

fits model: Mx250, Yz250. make: Yamaha. year: 1975–1976.

509-11638-01 Yamaha 1975-1976 Mx250 Yz250 Nos Piston

( Manufacturer Part Number: 509-11638-01 ), ( Part Type: Piston ), ( Country Of Origin: United States ), ( Manufacturer Warranty: Unspecified Length ), ( Storage Location: J8 Crp1-n Buk 36 )

Review YAMAHA Nos Piston fits MX250 YZ250 1975–1976

The Yamaha 509-11638-01 1975-1976MX250 YZ250 NO S piston is an authentic replacement part designed for Yamaha's iconic MX250 and YZ250 motorcycles of the 1975 and 1976 model years. This piston, which comes as a no-gasket item, is engineered to deliver original equipment (OE) performance and reliability to keep your classic off-road bike running in top condition.

Manufactured by a trusted aftermarket supplier, this piston is crafted from high-quality materials to ensure durability and resistance to wear and tear. The forged construction enhances its ability to withstand the rigors of off-road racing and provides superior heat transfer for optimal engine performance.

The piston's crown is designed with a dish shape and a compression height of approximately 31.5mm to accommodate the specifications of the 1975-1976 MX250 and YZ250 engines. The piston skirt is designed to ensure a snug fit within the cylinder bore, minimizing the possibility of piston slap and reducing engine noise.

The 509-11638-01 piston is also engineered with a precise ring groove design, ensuring compatibility with the factory piston rings. This compatibility ensures proper sealing and efficient combustion, ultimately contributing to enhanced engine performance and improved fuel economy.

This replacement piston is the ideal solution for riders seeking to restore their vintage Yamaha MX250 or YZ250 motorcycle to its original condition or for those who need to replace a worn-out or damaged piston. By using this authentic Yamaha replacement part, you can enjoy the peace of mind that comes with knowing your classic off-road bike is in good hands.

In conclusion, the Yamaha 509-11638-01 1975-1976MX250 YZ250 NO S piston is an essential component for any Yamaha enthusiast looking to maintain or restore their classic MX250 or YZ250 motorcycle. This high-quality, forged piston is designed to provide OE performance, durability, and reliability, ensuring your bike continues to run strong both on and off the track.

Buying a Yamaha MX250 or YZ250 without a piston from the years 1975-1976 (as represented by the part number 509-11638-01) can be a intriguing prospect for classic motorcycle enthusiasts. This engine component is an essential element in the two-stroke engine, and its absence means that the buyer will have to source and install it separately. Let's explore some potential pros and cons of this purchase.

Pros:

1. Authenticity: A non-running or partially disassembled motorcycle, especially one from the vintage era, can be an appealing project for collectors and enthusiasts. By acquiring a bike in this condition, you'll have the opportunity to restore it to its former glory using original parts, including the 250cc two-stroke engine.

2. Cost-effective: Buying a bike without a piston can potentially save you a significant amount of money. You can source a used piston from various vendors, potentially at a lower price compared to buying a fully assembled, running motorcycle.

3. Sense of accomplishment: Restoring a motorcycle is a rewarding experience, and the sense of satisfaction you'll feel when you finally start the engine after completing the project is unparalleled.

4. Customization: A non-running motorcycle provides a blank slate for customization. You have the freedom to choose the components you want, including the piston, to create a bike that suits your preferences and style.

Cons:

1. Time commitment: Restoring a motorcycle is a labor-intensive process that requires a considerable investment of time. The absence of a piston adds another layer of complexity to the project, as you'll need to source and install it before the engine can be reassembled and started.

2. Risk of damage: Handling engine components without proper knowledge or tools can lead to damage, which could result in additional costs and time spent on repairs.

3. Availability of parts: Finding the correct piston for your specific engine model and year can be challenging, especially if you're sourcing it from used markets or online vendors.

4. Cost of tools and equipment: Restoring a motorcycle requires a variety of specialized tools and equipment. While some of these items may be borrowed or rented, others may need to be purchased, adding to the overall cost of the project.

Conclusion:

Buying a Yamaha MX250 or YZ250 without a piston from the years 1975-1976 can be an intriguing and rewarding experience for classic motorcycle enthusiasts. While there are potential advantages, such as cost savings and the opportunity to restore the bike to its original condition, there are also challenges, such as the time commitment and the risk of damage. Ultimately, the decision to make this purchase depends on your budget, skill level, and dedication to the project. If you're confident in your abilities and willing to invest the time and resources required, this could be an exciting and rewarding journey. However, if you're uncertain about your capabilities or prefer a more turnkey solution, it may be worth considering a running motorcycle or seeking professional assistance for the engine rebuild.

Details:

To Watch. Every part is one-of-a-kind. Look for the Make Offer button on listing page. Yamaha MX / ATV.

Please verify the part number and compatible model's before purchasing. A rare NOS Yamaha 0.50mm oversize piston, perfect for restoring the engine of your vintage 1975-1976 MX250 or YZ250. Do you combine shipping?, Yes. We review all reasonable offers promptly.

Are these genuine OEM parts?, Yes. Yamaha Cruisers. Larger items from $46.99. FREE shipping on every order to the lower 48 states.

Item must be in original, uninstalled condition with no modifications. Residential delivery with lift gate is available. Do you accept offers?, Some listings offers. 4.8 out of 5 stars across 322 reviews.

Spotlight: A Day Inside . We started with a single motorcycle dismantled in home garage.

part #: 5091163801 prices

  • $53.58-$69.89

specifications pistondon:

  • for models: Mx250, Yz250
  • for makes: Yamaha
  • for years: 1975-1976
  • mpn: 509-11638-01
  • part type: Piston
  • country of origin: United States
  • manufacturer warranty: Unspecified Length
  • storage location: J8 Crp1-n Buk 36

general pistondon:

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

shipping pistondon:

  • type: Fixed
  • class: Standard, Expedited, One-day
  • cost: $0.00
  • transit: 3-6 Days
  • service: FedEx Ground / FedEx Home Delivery, USPS Priority Mail, FedEx 2Day, Overnight
  • carrier: FedEx, USPS

returns pistondon:

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

seller pistondon:

  • city: Odessa, Florida
  • # reviews: 221791
  • rating: 99.4%

payments pistondon:

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

offer pistondon:

  • availability: In Stock
  • started: April 12, 2026
  • quantity: 1
  • options: Ship-to-home
  • best offers: True
  • sold: 0
for models: mx250, yz250, for makes: yamaha, for years: 1975-1976, part type: piston, country of origin: united states, manufacturer warranty: unspecified length, storage location: j8 crp1-n buk 36,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > pistons, rings piston kits, sku: 11782991074403861,

Yamaha 509-11638-01 Is Similar To:

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5 offers $53.58–$69.89 USD
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