WISECO 12542MO7900 Big Piston Dmr Racing

( Brand: Wiseco ), ( Manufacturer Part Number: 12542MO7900 ), ( Type: Piston Kit ), ( Machine Type: Atv ), ( Piston Diameter: 79.00 Mm Bore )

Review WISECO Honda 1985 86 Big Bore Piston Esr dmr Racing fits 250R ATC ESR 1985-86

Introducing the WiseCO 12542MO7900 Big Piston ESR-DMR Racing Kit for the Honda ATC 250R model years 1985 and 1986. This high-performance kit is designed to take your ATV to the next level, delivering increased power, improved throttle response, and enhanced durability for aggressive racing applications.

The heart of this kit is the oversized forged piston, which boasts a displacement of 256cc, providing a significant power upgrade over the stock 249cc engine. The piston is engineered with a low compression height for increased engine performance and is designed to withstand the rigors of high-performance racing.

The WiseCO kit also includes a high-performance ESR-DMR cylinder head. This cylinder head features a large intake port for improved airflow and a high-performance exhaust port for enhanced power output. The head is also CNC-machined for precision and comes with a set of high-performance valves and springs for optimal engine performance.

The kit also includes a set of high-performance piston rings, which are designed to minimize friction and provide superior sealing for maximum power and efficiency. The rings are made from a high-quality material that ensures long-lasting performance and durability.

The WiseCO 12542MO7900 Big Piston ESR-DMR Racing Kit also includes a set of high-performance connecting rods and crankshaft bearings, which are designed to handle the increased power output and ensure reliable operation. The rods and bearings are made from high-strength materials to provide enhanced durability and resistance to wear and tear.

This kit is designed to be a direct replacement for the stock engine components and is easy to install. However, it is recommended that the installation be performed by a professional mechanic to ensure proper installation and tuning for optimal performance.

In summary, the WiseCO 12542MO7900 Big Piston ESR-DMR Racing Kit for the Honda ATC 250R model years 1985 and 1986 is a high-performance upgrade that delivers increased power, improved throttle response, and enhanced durability for aggressive racing applications. The kit includes a forged piston with a displacement of 256cc, a high-performance ESR-DMR cylinder head, high-performance piston rings, high-performance connecting rods, and crankshaft bearings. This kit is easy to install but is recommended to be installed by a professional mechanic to ensure optimal performance.

The Wiseco 12542MO7900 Honda ATV 1985-86 ATC 250R Big Piston ESR-DMR Racing Kit is a performance upgrade for Honda's ATC 250R all-terrain vehicle. This kit includes high-performance pistons and rings designed to increase power and improve engine durability. Let's examine the potential pros and cons of purchasing this kit.

1. Increased Power: The high-performance pistons and rings in this kit are designed to provide more power and torque, improving the overall performance of the engine.

2. Improved Durability: The Wiseco pistons are known for their superior quality and durability, which can help extend the life of the engine.

3. Enhanced Engine Response: The kit can help improve the engine's response time, making it more responsive to throttle inputs for better control and agility.

1. Cost: The Wiseco racing kit is not an inexpensive upgrade, and the cost may be a significant consideration for some buyers.

2. Installation Complexity: Installing the kit requires a certain level of mechanical expertise and specialized tools, which may add to the overall cost and complexity of the project.

3. Potential Engine Damage: Installing the wrong pistons or rings or making mistakes during the installation process could potentially cause engine damage.

The Wiseco 12542MO7900 Honda ATV 1985-86 ATC 250R Big Piston ESR-DMR Racing Kit is a high-performance upgrade for the Honda ATC 250R that can provide increased power, improved durability, and enhanced engine response. However, it comes with a significant cost and installation complexity, and there is a risk of potential engine damage if not installed correctly.

If you are an experienced mechanic or have access to one, and you are looking for a significant power upgrade for your Honda ATC 250R, the Wiseco racing kit is an excellent option. However, if you are not confident in your mechanical abilities or do not have the resources to install the kit correctly, it may be worth considering other performance upgrades or consulting a professional for advice.

Details:

New open box. Piston kit big bore Honda Atc 250R. No longer available Piston kit.

part #: 12542mo7900 prices

• $190.97-$201.99

specifications pistondon:

• for models: 250r, Atc, Esr
• for makes: Honda
• for years: 1985-86
• brand: Wiseco
• mpn: 12542mo7900
• type: Piston Kit
• machine type: Atv
• piston diameter: 79.00 Mm Bore

shipping pistondon:

• service: USPS Priority Mail
• cost: $15.00
• transit: 4-10 Days
• class: Expedited
• carrier: USPS
• type: Fixed

general pistondon:

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

offer pistondon:

• options: Ship-to-home
• started: February 3, 2026
• availability: In Stock
• quantity: 1
• sold: 0

payments pistondon:

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

seller pistondon:

• # reviews: 1116
• city: Bridgeport, New York
• rating: 99.5%

returns pistondon:

• policy: No Returns

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