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Phenolic Carburetor Insulator (Connecting Block) for Honda GX200/Clone Engines
138190051 Tillotson Clone Carburetor Plastic Insulator/Connecting Block - Front
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Phenolic Carburetor Insulator (Connecting Block) for Honda GX200/Clone Engines

Part Number: 138190051
Online Price: $3.99
Phenolic Carburetor Spacer (Connecting Block) – Fits GX200, Predator 212, and Clone Engines
Availability: In Stock.

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Description

Phenolic Carburetor Insulator (Connecting Block) – Fits GX200, Predator 212 & Clone Engines


The Phenolic Carburetor Insulator, also known as the connecting block or carburetor spacer, is a high-temperature, non-conductive plastic insert designed to sit between the carburetor and the cylinder head intake port. Its primary function is to reduce heat transfer from the engine block to the carburetor, which helps prevent fuel vapor lock, hard starting, and inconsistent fuel delivery.


Essential for high-performance and stock engine setups, this insulator features a fuel bowl vent channel that aligns with clone carburetor designs, ensuring proper fuel system function.


Key Features:

  • Precision-molded black phenolic plastic for high heat resistance
  • Blocks engine heat from reaching the carburetor
  • Helps maintain optimal fuel temperature and flow
  • Integrated bowl vent channel for clone-style carburetors
  • Direct replacement for OEM Honda and clone carburetor spacers

Technical Compliance:


AKRA 2020 Rules for Carburetor Insulator

The phenolic spacer must be flat across the entire gasket mating surface, with a minimum thickness on the gasket surface .265" (not including the gasket). The gasket surface must remain parallel. No angle cutting is allowed. The Center inlet hole is NON-TECH(size, configuration, finish), but no rifling, grooving, dimpling, etc., is allowed. Maximum mounting hole(s) size .300" NO-GO (checked with .300+ pin gauge)

Phenolic Spacer/Gasket(s) subject to spray test to check for leakage or introduction of air into the intake tract. When performing the spray test, the engine may stall or speed up; both indicate that the engine has failed this test.)


NKA 2020 Rules for the Carburetor Insulator

40.4.11.10: Phenolic Insulator

40.4.11.10.1: Black phenolic insulator plate must be run between carburetor and block. 

40.4.11.10.2: Plate hole and finish of plate are non-tech. 

40.4.11.10.3: Fuel bleed-off slot must be unaltered. 

40.4.11.10.4: Thickness must be maintained at .257" minimum. The plate must be flat and maintain consistent thickness at all points. 


Fits Small Block Engines:

  • Honda GX200 / Clone (196cc)
  • Box Stock Project 196
  • Tillotson 196 / 212 / 225
  • Ducar 196 / 212 / 224
  • Predator 212 (Hemi & Non-Hemi)
  • Predator 224 Non-Hemi
  • Wildcat 223



FAQ

Q1: What does a phenolic carburetor insulator do?
A1: It prevents heat transfer from the engine to the carburetor, helping avoid fuel vaporization (vapor lock) and improving cold starts and overall fuel delivery consistency.


Q2: Is this required for kart racing?
A2: Yes. Both AKRA and NKA kart racing rule sets mandate the use of a phenolic insulator between the carburetor and engine block. Specific thickness and design criteria must be met for tech legality.


Q3: What is the minimum legal thickness?
A3: Per AKRA rules, the minimum thickness is 0.265"; for NKA, it is 0.257". This part is designed to meet or exceed those specs.


Q4: Can I modify the insulator?
A4: No. According to both AKRA and NKA, you cannot alter the spacer’s fuel vent channel or machine the surface. Any modifications may result in the engine failing tech inspection.


Q5: Does it fit aftermarket or race carburetors?
A5: Yes. It fits a wide range of clone-style carburetors, including:

  • Tillotson PK-1
  • Huayi
  • Ruixing
  • SP clone-style units


Q6: Which engines are compatible with this insulator?
A6: It fits:

  • Honda GX200 / Clone (196cc)
  • Box Stock Project 196
  • Tillotson 196 / 212 / 225
  • Ducar 196 / 212 / 224
  • Predator 212 (Hemi & Non-Hemi)
  • Predator 224 Non-Hemi
  • Wildcat 223

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