1. Motorcycle Cylinder Heads & Valve Covers For Sale
  2. sku: 13443631661600602
  3. MAXPEEDINGRODS XINF31

MAXPEEDINGRODS XINF31 Cylinder Rebuild Intake Valve Kit Set

fits model: Trx400ex, Sportrax. make: Honda. year: 1999–2008.

Xinf31 Maxpeedingrods Cylinder Rebuild Intake Valve Kit For Honda Sportrax Trx400ex 1999-2008 Set

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: XINF31 ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Engine Type: 4-stroke ), ( Finish: Unfinished ), ( Fitment: For Honda Sportrax Trx400ex 1999-2008 ), ( Items Included: Bolts ), ( Machine Type: Off-road Motorcycle ), ( Material: Aluminum ), ( Performance Part: Yes ), ( Type: Cylinder Head ), ( Unit Type: Unit )

Review MAXPEEDINGRODS Cylinder Rebuild Intake Valve Kit Honda Set fits SPORTRAX TRX400EX 1999–2008

The Maxpeedingrods Xinf31 Cylinder Rebuild Intake Valve Kit is a high-performance upgrade for Honda Sportrax TRX400EX models produced between 1999 and 2008. This intake valve kit is designed to enhance engine power and efficiency by improving the intake process.

Each kit comes with three intake valves, three intake valve seats, three intake valve guides, and three springs. All components are made from high-quality materials, ensuring durability and reliability. The intake valves are designed with a larger diameter and longer length than OEM parts, allowing for increased airflow into the engine.

The intake valve seats are precision-machined to provide a perfect seal, reducing the risk of leaks and improving combustion efficiency. The intake valve guides are also machined to exacting specifications to ensure proper alignment and function of the intake valves.

The springs included in the kit have been upgraded for improved valve control, allowing for better engine response and power delivery. The spring rates have been carefully selected to provide optimal performance for the Sportrax TRX400EX.

Installing the Maxpeedingrods Xinf31 Cylinder Rebuild Intake Valve Kit requires cylinder head disassembly, making it a more involved installation process compared to some other upgrades. However, the benefits in terms of increased power and efficiency make it a worthwhile investment for serious off-road enthusiasts.

In summary, the Maxpeedingrods Xinf31 Cylinder Rebuild Intake Valve Kit is a high-performance upgrade for Honda Sportrax TRX400EX models that delivers increased airflow, improved combustion efficiency, and enhanced engine response. Each component is made from high-quality materials and is designed to provide durability and reliability. Installing the kit requires some mechanical expertise, but the benefits make it a worthwhile investment for those seeking to maximize the performance of their Sportrax TRX400EX.

Maxxispeedingrods Xinf31 Cylinder Rebuild Intake Valve Kit for Honda Sportrax TRX400EX (1999-2008): A Comprehensive Analysis

Introduction:

The Maxxispeedingrods Xinf31 Cylinder Rebuild Intake Valve Kit is designed for Honda Sportrax TRX400EX models manufactured between 1999 and 2008. This kit aims to improve engine performance by supplying new intake valves, springs, and retainers. In this analysis, we will discuss the potential benefits and drawbacks of purchasing this product to help you make an informed decision.

Pros:

1. Enhanced Engine Performance: New intake valves can improve air flow and combustion efficiency, leading to increased horsepower and torque.

2. Extended Engine Life: By replacing worn-out intake valves, you can prevent potential engine damage and extend the overall life of your ATV.

3. Improved Fuel Economy: More efficient combustion can lead to better fuel economy and reduced operating costs.

4. OEM-grade Quality: Maxxispeedingrods is known for providing high-quality aftermarket parts that meet or even surpass OEM specifications.

Cons:

1. Cost: Replacing intake valves is not a cheap endeavor, and this kit may be more expensive than some other aftermarket options.

2. Installation Complexity: Installing the kit may require advanced mechanical skills or professional assistance, which could add to the overall cost.

3. Potential for Engine Damage: If not installed correctly, the new parts could potentially damage other components in the engine.

Conclusion:

The Maxxispeedingrods Xinf31 Cylinder Rebuild Intake Valve Kit for Honda Sportrax TRX400EX offers several benefits, such as enhanced engine performance, extended engine life, improved fuel economy, and OEM-grade quality. However, it comes with some drawbacks, including cost, installation complexity, and potential engine damage if not installed correctly.

Based on the analysis, it is recommended that those with the necessary mechanical skills and experience install the kit themselves to save on labor costs. For those without the expertise, it may be worth considering hiring a professional mechanic to ensure proper installation and minimize the risk of engine damage. Ultimately, the decision to purchase this kit depends on your budget, mechanical ability, and desire for improved engine performance.

Details:

D ascription and Applications. Application: for Honda Sportrax TRX400EX 1999 -2008. Springs And Clips As Pictured. Return items must be in original condition.

Package included: 4 Rocker Arms. The reason for return. Type: Cylinder Rebuild Intake Valve Kit. Less expensive, easier to install.

O ther items >> you might also like. Specification: condition: 100% New High Quality. Return item must be in brand new and unused condition with original tags packaging. Cylinder Rebuild Intake Valve Kit for Honda Sportrax TRX400EX 1999 2008 Set.

For shipping damage case. Material: Aluminum. Item Quality problem. 2.High Quality.

Every product has quality inspection before leaving the factory. Our mechanic will inspect every return item. Components and materials ensure a longer service life.

specifications cylindermotorcycleiz:

  • for models: Trx400ex, Sportrax
  • for makes: Honda
  • for years: 1999-2008
  • brand: Maxpeedingrods
  • mpn: Xinf31
  • california prop 65 warning: California Prop 65 Warning
  • engine type: 4-stroke
  • finish: Unfinished
  • fitment: For Honda Sportrax Trx400ex 1999-2008
  • items included: Bolts
  • machine type: Off-road Motorcycle
  • material: Aluminum
  • performance part: Yes
  • type: Cylinder Head
  • unit type: Unit

payments cylindermotorcycleiz:

  • wallet: Google-pay
  • other
  • credit card: Diners-club

seller cylindermotorcycleiz:

  • rating: 99.3%
  • # reviews: 22020
  • city: Elk Grove Village, Illinois

offer cylindermotorcycleiz:

  • availability: In Stock
  • started: January 17, 2026
  • options: Ship-to-home
  • best offers: True
  • sold: 0
  • quantity: 10

general cylindermotorcycleiz:

  • condition: New
  • Motorcycle Scooter Parts Accessories > Engines Engine Parts > Cylinder Heads

returns cylindermotorcycleiz:

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

shipping cylindermotorcycleiz:

  • cost: $0.00
  • service: FedEx Ground / FedEx Home Delivery
  • class: Standard
  • carrier: FedEx
  • type: Fixed
  • transit: 5-9 Days
for models: trx400ex, sportrax, for makes: honda, for years: 1999-2008, california prop 65 warning: california prop 65 warning, engine type: 4-stroke, finish: unfinished, fitment: for honda sportrax trx400ex 1999-2008, items included: bolts, machine type: off-road motorcycle, performance part: yes, type: cylinder head, unit type: unit,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > cylinder heads, material: aluminum, sku: 13443631661600602,
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