1. Home
  2. Engines
  3. Tillotson Engines
  4. Tillotson 212R Engine
  5. Tillotson 212R Head & Valve Train
  6. Tillotson 212R OEM Head & Components
  7. Tillotson 212R-225RS Stock 5mm Retainers
Write a Review

Tillotson 212R-225RS Stock 5mm Retainers

Part Number: 138210103
Online Price: $3.99
Stock Retainers for Predator 212 Non-Hemi, Tillotson 212R and Tillotson 225 Engines
Availability: In Stock.

Send to:

*We'll ask for shipping info at checkout

Description

5mm Automotive-Style Valve Retainers – For Tillotson 212R, 225RS & Predator 212 Non-Hemi

High-strength 5mm retainers with automotive-style split lock support – OEM fitment with superior valve retention for performance and reliability.


Description

These 5mm automotive-style valve retainers are the standard in high-performance small engines like the Tillotson 212R, 225RS, and Predator 212 Non-Hemi. Designed to work with split locks (keepers), these retainers provide significantly better valve control and retention than traditional slip-on styles commonly used with 5.5mm valve setups.

Ideal for performance builds and high-RPM applications, these retainers are compatible with both OEM 5mm valves and EC's stainless steel 5mm stem valves. Whether you're building for racing, upgrading a stock engine, or maintaining a reliable valvetrain setup, these retainers deliver secure, stable valve operation as the valve opens, closes, and rotates during engine cycles.


Key Features:

  • OEM-Style Fit: Designed for 5mm valve stems using automotive-style split keepers
  • Superior Locking: More secure than slip-on retainers—ideal for high RPM use
  • Compatibility: Works with EC 5mm stainless steel valves and factory 5mm valves
  • Sold Individually: Order one per valve
  • Keepers (Part #138210104) Sold Separately


Compatible With Engines Using 5mm Valve Stems:

  • Tillotson 212R
  • Tillotson 225RS
  • Predator 212 Non-Hemi
  • Ghost 212
  • Wildcat 223 / 240
  • Ducar 212
  • Tillotson 212E


Why Choose Automotive-Style Retainers?

  • Stronger Retention: Split lock design ensures a firmer hold on the valve stem under high spring pressures
  • Track-Proven: Used in many race builds where reliability and precision matter
  • Direct Replacement: Works with factory and aftermarket heads that accept 5mm valves
  • Perfect for Upgrades: Pairs well with EC 5mm stainless valves for improved performance


Need a matching set of split locks/keepers (Part #138210104) Be sure to grab those separately to complete your setup.

FAQ

Q1: What engines are these retainers compatible with?

A: These retainers are designed for engines using 5mm valve stems, including Tillotson 212R, 225RS, Predator 212 Non-Hemi, Ghost 212, Wildcat 223/240, Ducar 212, and Tillotson 212E.


Q2: How are these better than slip-on retainers?

A: These automotive-style retainers use split keepers for a more secure and stable connection, especially under high-RPM or racing conditions. Slip-on retainers can loosen or fail under heavy loads.


Q3: Do these retainers work with EC's stainless steel valves?

A: Yes, they’re fully compatible with EC’s 5mm stainless steel valves and OEM 5mm valve stems.


Q4: Are keepers included with the retainers?

A: No. Keepers (Part #138210104) must be purchased separately. Each retainer requires one set of split locks.


Q5: Can I use these retainers in a performance build?

A: Absolutely. These retainers are designed to handle the demands of high-RPM and modified engines, making them a popular choice for kart racers and engine builders.

Related Items

Recently Viewed Items

Logo