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M8-1.25 Exhaust Nut for Honda GX200/Clone Engines
138190057 Tillotson Clone M8 Exhaust Nut
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M8-1.25 Exhaust Nut for Honda GX200/Clone Engines

Part Number: 138190057
Online Price: $1.00
M8-1.25 Exhaust Nut – Fits Honda GX200, Predator 212, and Clone Engines
Availability: In Stock.

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Description

M8-1.25 Exhaust Nut – Secure Header Fastening for GX200 & Clone Engines


The M8-1.25 Exhaust Nut is designed to secure your stock or aftermarket exhaust system to the cylinder head using the factory exhaust studs. Whether you're replacing a damaged nut or upgrading for reliability, this high-quality fastener ensures a tight, secure connection between the exhaust flange and the engine head.


In competitive kart racing, proper exhaust retention is a critical safety requirement. Using double nuts on each stud is the most common and approved method to prevent nuts from backing off under vibration or heat cycling. Alternatively, M8 bolts may be used, but they must be safety-wired through drilled heads to meet most technical standards.


Specifications:

  • Thread Size: M8 x 1.25
  • Torque Spec: 17 lb-ft using a 1/2” socket
  • Material: Heat- and vibration-resistant steel
  • Use with OEM exhaust studs or replace with M8 safety-wired bolts


Kart Racing Safety Note:

Most karting tech rules require:

  • Double-nutting each exhaust stud, or
  • Safety-wired M8 bolts if studs are not used

Failure to properly secure the exhaust may lead to disqualification or equipment damage.


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
  • Ghost 212
  • Wildcat 223 / 240

FAQ

Q1: What is the thread size of this exhaust nut?
A1: The nut has a thread size of M8 x 1.25, which matches the stock exhaust studs on most GX200 and clone engines.


Q2: Is this nut safe for racing applications?
A2: Yes, when used with a double-nut setup, it complies with most karting tech rules. It helps prevent the exhaust from loosening during a race.


Q3: Can I use bolts instead of nuts and studs?
A3: You can use M8 bolts, but to meet safety rules, they must be drilled and safety-wired to prevent loosening. Nuts with double-nutting are often preferred for ease and compliance.


Q4: What is the proper torque spec for this nut?
A4: Torque to 17 lb-ft using a 1/2” socket for optimal sealing without over-tightening.


Q5: What engines is this exhaust nut compatible with?
A5: 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
  • Ghost 212
  • Wildcat 223 / 240

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