YAMAHA 251-11637-00 Piston RT1 0.75MM 3RD

( Manufacturer Part Number: 251-11637-00 ), ( Part Type: Piston ), ( Country Of Origin: United States ), ( Manufacturer Warranty: Unspecified Length ), ( Storage Location: J8 Crp1-n Buk 57 )

Review YAMAHA Rt1 Oem 0.75mm 3rd Oversize Piston fits CT1 AT1 1969–1971

Yamaha CT1 AT1 RT1 0.75mm 3rd Piston (1969-1971)

The Yamaha CT1 AT1 RT1 0.75mm 3rd Piston is an essential replacement component for the Yamaha CT1, CT1-A, AT1, and RT1 motorcycles produced between 1969 and 1971. This piston is specifically designed for the third cylinder of these iconic two-stroke bikes.

Manufactured with meticulous precision, this piston is crafted from high-quality aluminum alloy, ensuring both durability and lightweight performance. The 0.75mm thickness of this piston is ideal for ensuring optimal engine performance and efficiency, while also providing excellent heat dissipation capabilities.

The piston features a finned design on the underside, which enhances cooling efficiency by increasing the surface area in contact with the engine coolant. This design is crucial for maintaining engine temperature stability, especially during prolonged periods of use.

Additionally, the piston skirt has a precise honing finish, ensuring a snug fit within the cylinder bore. This results in minimal piston-to-cylinder wall friction, which in turn reduces engine wear and improves overall performance.

Installation of this piston is made easy through its inclusion of a matching rings kit, which consists of a compression ring, an oil control ring, and a piston ring groove sealer. This kit ensures a proper seal between the piston and cylinder, preventing the loss of compression and engine oil.

In conclusion, the Yamaha CT1 AT1 RT1 0.75mm 3rd Piston (1969-1971) is a premium replacement component designed to provide exceptional performance and reliability for your classic Yamaha motorcycle. With its high-quality materials, finned cooling design, and perfectly honed skirt finish, this piston is sure to exceed your expectations and keep your vintage bike running strong for years to come.

The Yamaha CT1, AT1, and RT1 motorcycles were manufactured between 1969 and 1971. Replacing the third piston on these bikes can be an essential maintenance task to keep the engine running smoothly. Let's discuss the pros and cons of buying a 0.75mm 3rd piston (Yamaha 251-11637-00) for this motorcycle.

1. OEM Part: This piston is an original equipment manufacturer (OEM) part, which means it is designed and manufactured by Yamaha. Using an OEM part can ensure proper fitment and performance.

2. Ensures Engine Health: Replacing a worn-out or damaged piston is crucial to maintain engine health and prevent further damage.

3. Long-Lasting: High-quality OEM parts like this one are often designed to last longer than aftermarket alternatives, providing better value in the long run.

1. Cost: OEM parts may be more expensive than aftermarket alternatives, which could be a concern for some budget-conscious buyers.

2. Availability: Depending on the location and availability, it may take some time to source and obtain this OEM part.

In summary, the Yamaha 251-11637-00 0.75mm 3rd piston is a high-quality OEM part that ensures proper fitment, performance, and engine health for Yamaha CT1, AT1, and RT1 motorcycles. However, its cost and availability may be a concern for some buyers. Ultimately, the decision to purchase this part depends on your budget, time constraints, and preference for OEM parts.

If you prioritize the use of genuine OEM parts and are willing to pay a premium for the assurance of optimal engine performance and longevity, then the Yamaha 251-11637-00 0.75mm 3rd piston is a recommended choice for your Yamaha CT1, AT1, or RT1 motorcycle.

Details:

Yamaha Cruisers. Do you accept offers?, Some listings offers. FREE shipping on every order to the lower 48 states. Residential delivery with lift gate is available.

A genuine Yamaha OEM 0.75mm 3rd oversize piston, ideal for rebuilding the engine of your vintage 1969-1971 CT1, AT1, or RT1.: Are these genuine OEM parts?, Yes. 4.8 out of 5 stars across 322 reviews. Larger items from $46.99.

Do you combine shipping?, Yes. Look for the Make Offer button on listing page. Yamaha MX / ATV. Every part is one-of-a-kind.

We review all reasonable offers promptly. To Watch. Please verify the part number and compatible model's before purchasing. Ensures precise fit and reliable performance.

Item must be in original, uninstalled condition with no modifications. We started with a single motorcycle dismantled in home garage. Spotlight: A Day Inside .

part #: 2511163700 prices

• $17.89-$89.00

specifications pistondon:

• for models: Ct1, At1
• for makes: Yamaha
• for years: 1969-1971
• mpn: 251-11637-00
• part type: Piston
• country of origin: United States
• manufacturer warranty: Unspecified Length
• storage location: J8 Crp1-n Buk 57

payments pistondon:

• other
• credit card: Discover
• wallet: Paypal

returns pistondon:

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

seller pistondon:

• rating: 99.4%
• # reviews: 221771
• city: Odessa, Florida

offer pistondon:

• quantity: 1
• best offers: True
• options: Ship-to-home
• sold: 0
• started: April 11, 2026
• availability: In Stock

general pistondon:

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

shipping pistondon:

• service: USPS Ground Advantage, USPS Priority Mail, FedEx 2Day, Overnight
• class: Standard, Expedited, One-day
• type: Fixed
• transit: 4-9 Days
• cost: $0.00
• carrier: USPS, FedEx

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