YAMAHA 25Y-11635-00 Piston Nos YZ80LC 0.25 O.s.

( Manufacturer Part Number: 25Y-11635-00 ), ( Part Type: Piston ), ( Country Of Origin: United States ), ( Manufacturer Warranty: Unspecified Length ), ( Storage Location: J8 Crp1-n Buk 63 )

Review YAMAHA 1st 0.25.s. Piston Nos fits YZ80 1985–1992

Introducing the Yamaha 25Y-11635-00 piston set, specifically designed for the Yamaha YZ80 and YZ80LC motorcycles produced between the years 1985 and 1992. These pistons are part of the engine's critical internal components, responsible for converting linear motion from the crankshaft into rotational motion through the connecting rod and transmitting power to the crankshaft.

The Yamaha 25Y-11635-00 piston set is engineered with exceptional precision and attention to detail. Each piston is manufactured using high-quality aluminum alloy, ensuring optimal strength, durability, and lightweight properties. The piston crowns have been carefully designed with a dome shape and a compression height of 35.5mm, providing an efficient combustion process and enhanced power output.

The piston rings included in this set are made from nitrided chrome steel, ensuring a snug fit within the cylinder bore while providing excellent sealing properties. This results in minimal compression leakage and optimal engine performance. The piston skirts feature a honed finish, ensuring a perfect fit within the cylinder and reducing friction for smoother engine operation.

The Yamaha 25Y-11635-00 piston set includes piston pins and piston pin bushings, ensuring a secure connection between the piston and the connecting rod. The piston pins are made from high-tensile steel, providing the necessary strength and durability to support the engine's power output. The piston pin bushings are designed to minimize friction, reducing wear and tear on the piston and engine components.

In conclusion, the Yamaha 25Y-11635-00 piston set is an essential upgrade for any Yamaha YZ80 or YZ80LC motorcycle produced between the years 1985 and 1992, seeking improved engine performance, durability, and reliability. These pistons are meticulously engineered with precision and attention to detail, ensuring optimal fit, function, and power output for your Yamaha motorcycle.

Buying a new set of pistons for a Yamaha YZ80 or YZ80LC motorcycle produced between 1985 and 1992 can be a valuable investment for those looking to enhance the performance of their bikes or restore them to original condition. However, like any purchase, there are pros and cons to consider before making a decision.

1. Improved performance: New pistons can help increase horsepower and torque, resulting in improved acceleration and top speed.

2. Better fuel efficiency: Worn-out pistons can cause inefficiencies, leading to increased fuel consumption. New pistons can help improve fuel efficiency and save money on gas.

3. Longer engine life: Worn-out pistons can lead to engine damage and failure if left unaddressed. Replacing them with new pistons can help extend the life of the engine.

4. Enhanced reliability: New pistons can help reduce the risk of engine failure, providing peace of mind and reliability.

5. Customization: New pistons can be used for custom builds, allowing riders to personalize their bikes.

1. Cost: New pistons can be expensive, especially when purchased as part of a kit that includes other components.

2. Installation: Installing new pistons can be a complex process that requires specialized tools and knowledge. It may be necessary to hire a professional mechanic to do the job.

3. Time: Installing new pistons can take several hours, depending on the mechanic's availability and the complexity of the installation.

4. Risk of damage: There is always a risk of damaging other engine components during the installation process, which can add to the cost.

5. Potential for diminishing returns: Depending on the condition of the rest of the engine, new pistons may not result in significant performance gains.

Replacing the pistons on a Yamaha YZ80 or YZ80LC motorcycle can offer significant performance benefits and extend the life of the engine. However, the cost, complexity of installation, and potential for diminishing returns are factors to consider before making a purchase. Ultimately, the decision to buy new pistons depends on the individual's goals, budget, and technical abilities.

For those looking to improve the performance of their Yamaha YZ80 or YZ80LC motorcycle and have the necessary skills and resources, purchasing new pistons can be a worthwhile investment. However, for those who are unsure about the installation process or have limited funds, it may be worth considering other upgrades or seeking professional advice before making a purchase.

Details:

Yamaha Cruisers. The image to watch on YouTube. This New Old Stock NOS Yamaha OEM 1st 0.25mm oversize piston, part number 25Y-11635- is a genuine replacement for 1985 1992 YZ80 and YZ80LC model's. Piston NOS 25Y-11635-00: 1985 1992 Yamaha YZ80 YZ80LC 1st 0.25.S.

Essential for engine rebuilds to restore optimal performance. Yamaha MX / ATV. Fits: This 0.25mm oversize piston fits Yamaha YZ80 and YZ80LC dirt bikes from 1985 -1992. Spotlight: A Day Inside .

part #: 25y1163500 prices

• $39.95-$48.84

specifications pistondon:

• for models: Yz80
• for makes: Yamaha
• for years: 1985-1992
• mpn: 25y-11635-00
• part type: Piston
• country of origin: United States
• manufacturer warranty: Unspecified Length
• storage location: J8 Crp1-n Buk 63

seller pistondon:

• rating: 99.2%
• city: Odessa, Florida
• # reviews: 2021 35

offer pistondon:

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

returns pistondon:

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

payments pistondon:

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

general pistondon:

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

shipping pistondon:

• class: Standard, Expedited, One-day
• carrier: FedEx, USPS
• transit: 4-8 Days
• type: Fixed
• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery, USPS Priority Mail, FedEx 2Day, Overnight

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