1. Home
  2. Engines
  3. Tillotson Engines
  4. Tillotson 196R Box Stock Clone Engine
  5. Tillotson 196R Ignition & Flywheel
  6. Brass Spark Plug Indexing Washers - 4 Pack
Brass Spark Plug Indexing Washers - 4 Pack
Copper Spark Plug Indexing Washers - 4 Pack
Write a Review

Brass Spark Plug Indexing Washers - 4 Pack

Part Number: KM-4813
Online Price: $8.43
Phone Order Price:$9.99
You Save:$1.56(16%)
Spark Plug Indexing Washers – Precision Electrode Alignment & Piston Clearance | Pack of 4
Availability: In Stock.

Send to:

*We'll ask for shipping info at checkout

Description

Spark Plug Indexing Washers – Electrode Positioning & Piston Clearance


EC’s Spark Plug Indexing Washers are an essential tuning component for performance engine builders looking to maximize combustion efficiency and ensure piston-to-spark plug clearance. These washers allow you to rotate and position your spark plug electrode for optimal exposure to the combustion chamber, commonly referred to as spark plug indexing.


Beyond improving ignition efficiency, indexing washers are frequently used to create critical clearance between the piston dome and the ground strap of the spark plug in high-compression or long-rod engine builds.


Features & Benefits:

  • Unshrouds the electrode for more complete combustion and improved flame front propagation
  • Prevents piston-to-plug contact in engines with tight tolerances
  • Ideal for race engines using domed pistons or extended reach plugs
  • Quick and simple to install during plug gap or tune-up adjustments
  • Great for karting, minibike racing, and small engine performance


Washer Specifications:

  • Outer Diameter (O.D.): .804”/20.5mm
  • Inner Diameter (I.D.): .550”/14mm
  • Thickness: .025”/.6mm


Sold In Packs of 4 

FAQ

What are spark plug indexing washers used for?

Spark plug indexing washers allow you to rotate your spark plug to position the electrode opening toward the combustion chamber, improving ignition efficiency. They are also used to create clearance between the piston and spark plug in tight-tolerance or high-compression engines.


How do I use indexing washers?

Install the spark plug with no washer first, mark the electrode position, and see where it ends up when tightened. If it's not facing the ideal direction, use one of the washers to adjust the plug’s clocking angle. Choose the thickness that orients the open gap toward the intake side or combustion center.


What engines are these washers compatible with?

These are ideal for small engines such as:

  • Predator 212
  • Wildcat 223
  • GX200 clones
  • Tillotson and Ducar performance engines
    They work well in go-karts, mini bikes, and other high-performance small engine builds.


What are the washer dimensions?

  • Outer Diameter: 0.804” (20.5mm)
  • Inner Diameter: 0.550” (14mm)
  • Thickness: 0.025” (0.6mm)


How many washers are included?

Each pack contains 4 indexing washers.


Will these affect heat transfer or plug performance?

No, when used correctly (only one washer per plug), they will not significantly impact heat transfer or plug function. Always monitor plug performance after installation, especially in race applications.

Related Items

Autolite AR-3910X Spark Plug
$7.99
Out of Stock.

Recently Viewed Items