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Tillotson 196-212-225 Non-Hemi Rocker Lock Nut
Clone Non-Hemi Rocker Lock Nut
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Tillotson 196-212-225 Non-Hemi Rocker Lock Nut

Part Number: 138190035
Online Price: $0.99
Small Block Non-Hemi Rocker Lock Nut
Availability: In Stock.

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Description

138190035 Rocker Arm Lock Nut – For Non-Hemi GX200 & Clone Engines

Secure your rocker arm lash settings with this OEM-style jam nut – designed to keep valve lash stable under heat and vibration.


The 138190035 Rocker Lock Nut is a precision-fit jam nut used on non-hemi GX200-style clone engines to lock down the rocker arm adjuster. By securing the lash adjustment, this nut prevents valve lash from backing off due to vibration or engine heat cycles—helping maintain consistent valve timing and performance.


This is an OEM replacement part for 196cc 6.5hp Honda GX200 clones and their variants. Ideal for high-RPM engines, rebuilds, or performance upgrades, it's a simple but essential component to protect your valve train.


Key Features:

  • OEM Replacement Part #: 138190035
  • Function: Locks the rocker arm lash adjuster nut in place
  • Prevents Lash Drift: Ensures lash setting stays consistent during operation
  • High-Heat Reliability: Helps maintain valve settings after heat cycles
  • Fitment: 10mm hex; torque to 85 in/lbs


Compatible With:

  • Honda GX200 Clones (196cc, 6.5hp) – Non-Hemi
  • Tillotson 196R, 212R, 225RS
  • Predator 212 / 224 Non-Hemi
  • Ducar 196 / 224 Non-Hemi
  • Wildcat 240
  • Box Stock Project 196 Engines


Tech Tip:

Always re-check lash settings after the first heat cycle of a new build. These lock nuts are crucial to keeping your top-end in spec under high RPM stress.

FAQ

Q1: What does the rocker lock nut do?

A: The rocker lock nut secures the lash adjuster nut, preventing it from backing off during engine operation. This helps maintain consistent valve lash settings, even under high RPM and heat.


Q2: What engines is this lock nut compatible with?

A: It fits non-hemi heads on:

  • Honda GX200 clones (196cc, 6.5hp)
  • Predator 212 & 224 Non-Hemi
  • Tillotson 196R / 212R / 225RS
  • Ducar 196 / 224 Non-Hemi
  • Wildcat 240
  • Box Stock Project engines


Q3: What are the torque specs for this nut?

A: Torque the lock nut to 85 in/lbs using a 10mm socket.


Q4: Do I need to reset lash after installing this nut?

A: Yes. It’s recommended to check and reset valve lash after the engine goes through its first heat cycle, as clearances can shift slightly as components settle.


Q5: Is this a direct OEM replacement?

A: Yes. This nut matches OEM part #138190035 and is a direct-fit replacement for non-hemi clone and performance small engines.

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