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Tillotson 212R-225RS Stock 5mm 25mm Exhaust Valve

Part Number: 138210102
Online Price: $7.99
25mm Exhaust Valve 5mm Stem – Tillotson & Predator 212
Availability: In Stock.

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Description

EC 25mm Exhaust Valve with 5mm Stem – For Tillotson 212R, 225RS & Predator 212 Non-Hemi

High-flow, lightweight 25mm exhaust valve with a 5mm stem – OEM-style fitment with improved airflow and durability for small engine builders and racers.


Upgrade your engine's exhaust system with the EC 25mm Exhaust Valve, designed specifically for the Tillotson 212R, Tillotson 225RS, and Predator 212 Non-Hemi cylinder heads. This OEM-style valve features a 5mm stem, compatible with the factory automotive-style retainers and locks used in these engines.


Compared to the standard 24mm exhaust valves found in Honda GX200s and 196cc clone engines, this 25mm valve offers increased flow potential while maintaining a lightweight design. The reduced stem diameter improves airflow efficiency and reduces valvetrain mass—essential for high-RPM performance and smoother engine response.


Key Features:

  • Fits: Tillotson 212R, 225RS, Predator 212 Non-Hemi heads
  • Upgraded Size: 25mm head for improved exhaust flow over 24mm GX200-style valves
  • 5mm Stem: Lightweight, compatible with stock 5mm retainers and valve locks
  • Material: High-strength carbon steel for durability under heat and stress
  • Performance Benefits: Better flow, lighter weight, supports higher RPM builds


Valve Specifications:

  • Head Diameter: 0.9845” / 25mm
  • Stem Diameter: 0.1925” / 5mm
  • Overall Length: 2.5215” / 64mm
  • Weight: ~19.8g
  • Material: Carbon Steel


Why Upgrade to a 25mm Exhaust Valve?

  • Better Flow: The larger valve head improves exhaust gas evacuation, enhancing performance in both stock and modified engines.
  • Weight Savings: The 5mm stem reduces valvetrain mass, supporting higher engine speeds with less stress on valve springs.
  • Direct Fit: Works with factory Tillotson and Predator Non-Hemi components—no modification needed.


Perfect for builders looking to increase power and reliability in karting, mini bikes, and racing-class small engines.

FAQ

Q1: What engines does this 25mm exhaust valve fit?

A: It fits the Tillotson 212R, Tillotson 225RS, and Predator 212 Non-Hemi cylinder heads that use 5mm valve stems and OEM-style 5mm retainers and locks.


Q2: Is this valve larger than the stock exhaust valve?

A: Yes. Most stock clone engines use a 24mm exhaust valve. This valve has a 25mm head for increased exhaust flow and better performance.


Q3: Can I use this valve with the stock retainers and springs?

A: Yes. This valve is designed for 5mm retainers and locks, making it a direct-fit replacement for engines that already use 5mm components.


Q4: What material is the valve made of?

A: The valve is made from high-strength carbon steel, designed to withstand high temperatures and stress from performance use.


Q5: What are the benefits of a 5mm stem vs. a 5.5mm stem?

A: A 5mm stem reduces overall valve weight, allowing for improved RPM capability and reduced stress on valve springs and retainers—perfect for high-performance builds.

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