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28.5mm 5.5mm Stainless Steel Stock Length Valve for Honda GX200/Clone
28.5mm stainless steel intake valve for Honda GX200 and clone racing cylinder heads
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28.5mm 5.5mm Stainless Steel Stock Length Valve for Honda GX200/Clone

Part Number: R-4
Online Price: $19.99
28.5mm Stainless Steel Intake Valve for Honda GX200, Clone & Racing Cylinder Heads
Availability: In Stock.

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Description

28.5mm Stainless Steel Intake Valve – Honda GX200, Clone & Modified Racing Cylinder Heads

Increase airflow and unlock more horsepower with this 28.5mm Stainless Steel Intake Valve, engineered for modified Honda GX200 and clone racing cylinder heads. Designed for serious engine builders, this oversized valve is an excellent upgrade for high-performance mini bike and go-kart engines where maximum intake flow is essential.


Manufactured from premium stainless steel, this valve offers exceptional strength, heat resistance, and durability under the demanding conditions of high-RPM racing. The larger 28.5mm valve head increases airflow into the combustion chamber, making it an ideal choice for ported cylinder heads, high-lift camshafts, and modified clone engines.


This valve is designed for cylinder heads equipped with 5.5mm valve guides and requires professional machining to install new oversized valve seats.


Features & Benefits

Oversized 28.5mm Intake Valve

The larger valve head provides significantly greater airflow potential than stock valves, allowing your engine to better support high-lift camshafts, ported heads, increased displacement, and higher RPM.


Premium Stainless Steel Construction

Manufactured from high-quality stainless steel for superior:

  • Heat resistance
  • Wear resistance
  • Corrosion protection
  • High-RPM durability
  • Long service life

Perfect for performance and racing applications.


Designed for High-Performance Cylinder Heads

Ideal for modified factory cast cylinder heads used on:

  • Racing mini bikes
  • Go-karts
  • Drag racing engines
  • Oval track engines
  • Performance Honda clone builds


Professional Racing Upgrade

This is not a stock replacement valve. It is intended for professionally machined cylinder heads requiring oversized valve seats and precision valve jobs.


Valve Specifications

Specification

Value

Valve Type

Intake

Head Diameter

28.5mm

Stem Diameter

5.5mm

Valve Length

Stock Length

Maximum Overall Length

2.575"

Valve Face Angle

45°

Margin

.035"

Seat Width

.100"

Valve Tip Length

.156"

Valve Head

Dished

Engine Compatibility

Designed for cylinder heads utilizing 5.5mm valve guides, including:

  • Honda GX200
  • 196cc Clone Engines
  • Shredder Cylinder Heads
  • Most 14cc Racing Heads
  • Other aftermarket cylinder heads converted to 5.5mm valve guides

Many Predator 212, Tillotson, Wildcat, Ducar, and other Honda-clone cylinder heads originally equipped with 5mm valve guides can be converted by reaming the guides or installing new 5.5mm valve guides.


Installation Notes

  • Requires machining for oversized valve seats
  • Professional valve seat cutting required
  • Designed for experienced engine builders and machine shops
  • Compatible with performance valve springs, retainers, and high-lift camshafts
  • Always verify valve-to-piston clearance before final engine assembly


Perfect For

  • Modified Honda Clone Engines
  • Racing Mini Bikes
  • Competition Go-Karts
  • Open Modified Clone Engines
  • Big Valve Cylinder Head Builds
  • High Compression Engines
  • High RPM Racing Applications

FAQ

Will this valve fit a stock Honda GX200 cylinder head?

No. Although it fits 5.5mm valve guides, this oversized 28.5mm valve requires the cylinder head to be machined for larger valve seats. It is intended for modified performance cylinder heads.


What valve guide size is required?

This valve uses a 5.5mm valve stem and is designed for cylinder heads equipped with 5.5mm valve guides.


Can I use this valve in a Predator 212 or other Honda-clone engine?

Yes. Many Predator, Tillotson, Wildcat, and Ducar cylinder heads can be converted to accept this valve by installing or machining for 5.5mm valve guides and cutting new oversized valve seats.


What are the advantages of a 28.5mm intake valve?

The larger valve head increases airflow into the cylinder, allowing the engine to support higher horsepower, larger camshafts, improved cylinder head porting, and increased RPM potential.


Is this valve suitable for racing?

Yes. This valve is designed for high-performance mini bikes, racing go-karts, drag racing, and other modified Honda-clone engine applications.


Do I need a machine shop to install this valve?

Yes. Professional installation is required because oversized valve seats must be machined and installed correctly to ensure proper sealing and performance.

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