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Tillotson 5.5mm Clone Lash Cap (Valve Rotor)
Stock Lash Cap for 5.5mm Valves
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Tillotson 5.5mm Clone Lash Cap (Valve Rotor)

Part Number: 138190029
Online Price: $1.99
Availability: In Stock.

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Description

Clone Exhaust Valve Lash Cap (138190029) – For 196cc GX200 & Clone Engines


Ensure proper valve function and meet race compliance with the Clone Lash Cap (Valve Rotor), designed for use on exhaust valves in 196cc Honda GX200-style clone engines. This OEM-style lash cap sits on the valve stem and interfaces with the retainer, helping to reduce tip wear and maintain consistent valve lash in performance or regulated engine builds.


This lash cap is commonly required in AKRA and NKA-sanctioned racing events and is an essential part of a compliant and durable valvetrain setup.


Key Features:

  • Fits: 196cc GX200 Clone Engines (Non-Hemi)
  • Application: Exhaust valve only (per AKRA/NKA rules)
  • Weight: ~2.0 grams average
  • OEM Fitment: Works with stock spring retainers
  • Prevents Wear: Protects valve stem from direct rocker contact
  • Race Compliant: Approved under AKRA and NKA guidelines


Compatible Engines:

  • Honda GX200
  • 196cc Clone Engines
  • Tillotson 196R / 196RS
  • Ducar 196
  • Box Stock Project 196


Performance Note:

Valvetrain weight matters—especially in racing engines. Each gram added to the valve tip can lower your max RPM by up to 40 RPM. At approximately 2 grams, this lash cap should only be used if required by class rules. For higher-RPM applications, consider lightweight lash caps if rules permit, or avoid using one altogether when legal.


Race Rule Reference:

AKRA 2020 Rules:

  • Lash caps allowed on exhaust valve only

NKA 2020 Rules:

  • 40.4.20.4.10: Lash caps permitted only on exhaust
  • Intake retainers must appear stock (no length or thickness checks)
  • Materials must be magnetic

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