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68mm Standard Piston Assembly Kit for Honda GX200/Clone Engines
138190007 Tillotson 68mm Standard Piston & Ring Kit
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68mm Standard Piston Assembly Kit for Honda GX200/Clone Engines

Part Number: 138190007
Online Price: $17.00
68mm Standard Bore Piston Assembly Kit – GX200 & 196cc Clone Engines
Availability: In Stock.

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Description

68mm Standard Piston Assembly Kit for Honda GX200 / Clone Engines


The 138190007 Piston Assembly Kit is a complete, ready-to-install piston solution for 196cc clone engines. Featuring the lightweight Tillotson 68mm piston, low-tension performance rings, full-floating wrist pin, and circlips, this kit is designed for racers and builders looking for OEM-level reliability with maximum performance and compliance.


This kit offers reduced friction, improved sealing, and optimized weight, making it ideal for competitive karting applications governed by AKRA or NKA regulations.


What’s Included:

  • 138190008 – Tillotson 68mm Lightweight Cast Piston
  • 138190009 – Low Tension 3-Ring Set (Standard Bore)
  • 138190010 – 18mm Full Floating Wrist Pin
  • 138190010 – Set of Circlips (pair)


Key Features:

  • Standard 68mm Bore – Compatible with most 196cc clone engines
  • Dished Top Piston – Stock-style, AKRA/NKA legal
  • Lightweight – Piston weight ~146g (meets 145g min. rule)
  • Low Friction – Low tension ring design improves ring seal and reduces drag
  • Fully Legal – Compliant with AKRA & NKA piston, pin, and ring rules


Compatible With:

This kit fits most 196cc small-block clone engines, including:

  • Tillotson 196R / 196RS
  • Ducar 196
  • Box Stock Project (BSP) 196
  • Speed Kart 196
  • Other GX200-style clone engines

Fitment Note:
If using in a Honda GX200 or GX160, you must use clone-style rings—Honda OEM rings may not fit properly.


Not Compatible With:

  • Predator 212 (Hemi & Non-Hemi)
  • Ghost 212
  • Predator 224
  • Tillotson 212E, 225, or larger
  • Ducar 212 / 224
  • Wildcat 223 / 240


Rulebook Compliance

AKRA 2020 Rules for Piston & Rings
The piston must be unaltered box stock only. Overall piston length 1.935" max, 1.920" min and from top of wrist pin to the top of piston .580" max. The arrow on top of the piston must be pointed towards valves/lifters. Overall length wrist pin 2.100" min, inside diameter .550" max. Top ring and middle ring .115" max-width, .060" max thickness.) Filing of ring end gaps permitted including oil expander, max end gap .040" (top rings only.) The lapping of rings permitted for proper seal. Piston Ring must be on the piece (unbroken) when presented for tech. Piston Rings must be self-supporting in the cylinder bore when checked installed on the piston with a connecting rod attached (rod cap and bolts installed are not required for this check). Minimum weight of piston 145 grams. Honing of wrist pin journals permitted. The bore surface must remain flat and retain stock configuration edges. The skirt of the piston must retain as produced no chamfering, radius, or breaking of edges permitted. Up to .010" over piston allowed


NKA 2020 Rules for Piston & Rings

  • 40.4.12: Piston
  • 40.4.12.1: Must be of a three-ring design.
  • 40.4.12.2: Minimum weight of 145 grams with Oil Expander Ring and two rail
  • rings installed.
  • 40.4.12.3: Piston length is 1.935" max, 1.910" minimum. .580" max top of
  • wrist pin hole to top of the piston as measured with a dial caliper.
  • 40.4.12.4: Standard bore is 2.685", maximum overbore allowed is 2.700".
  • 40.4.12.5: The piston is not allowed to be any higher than the deck of the block
  • at TDC, zero tolerance (zero deck height).
  • 40.4.12.6: No flat top piston allowed; must be dished-OEM w/no modifications.
  • 40.4.12.7: Aftermarket pistons and/or sizes up to .25mm (0.010") over are
  • permitted.
  • 40.4.12.8: Machining of the piston is prohibited.
  • 40.4.13: Piston Rings
  • 40.4.13.1: It is mandatory that all three rings be intact and functional.
  • 40.4.13.2: Top ring must be the chrome face ring
  • 40.4.13.3: No alterations of rings are permitted.
  • 40.4.13.4: Ring Sizes
  • -Top Ring
  • .058" +/-.005" height & .115" maximum width.
  • -Middle Ring
  • .058" +/-.005" height & .115" maximum width.
  • - Oil Expander Ring (reference)
  • .095" +/-.005" height & .092" +/-.005" width
  • 40.4.14: Ring Tension Requirement
  • - Top two rings must support themselves in the cylinder when removed from the piston. They cannot fall through the cylinder.
  • - The bottom ring is a non-tech item regarding tension. The bottom expander ring & two rail rings, when mounted on piston and rod in place, should support piston in
  • the cylinder when inserted upside-down.
  • 40.4.15: Ring Tension Inspection Procedure
  • - Top 2 rings must support themselves without assistance in the cylinder.
  • - Each of the top two rings should be placed, individually, approx. one inch
  • (1") down in the cylinder.
  • -  Square ring with piston turned upside down.
  • - If the ring supports itself, it is legal.



This factory-assembled 68mm piston kit is perfect for stock-class kart racers and engine builders looking for a competitive, rule-legal edge. The low tension rings paired with a lightweight dished piston offer reduced friction, better ring seal, and peak performance for 196cc clone engines.



FAQ

1. What engines is this 68mm piston kit compatible with?

This kit fits most 196cc clone-style engines, such as:

  • Tillotson 196R/196RS
  • Box Stock Project (BSP) 196
  • Ducar 196
  • Speed Kart 196
  • Other GX200-based clones

It does not fit Predator 212, 224, Ghost 212, or Tillotson 212E/225 engines due to bore or pin differences.


2. Does this piston kit meet AKRA/NKA regulations?

Yes, this assembly is fully compliant with both AKRA and NKA rules, including:

  • Minimum piston weight of 145g
  • Dished top, 3-ring design
  • Legal compression height and wrist pin dimensions
  • Low-tension rings that support themselves in the bore


3. What’s included in this kit?

  • 68mm cast aluminum piston (Tillotson 138190008)
  • Standard low-tension 3-ring set (138190009)
  • Full-floating 18mm wrist pin (138190010)
  • Circlips for wrist pin retention


4. Can I use this in an original Honda GX200 engine?

Yes, but you must use clone-style rings. Honda OEM rings may not fit the groove profiles of this piston.


5. Are the low-tension rings legal and durable?

Yes. These are factory-designed low-tension rings—not heat-treated aftermarket mods. They reduce friction while maintaining rulebook legality and durability under racing conditions.

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