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EC 72mm / 2.835” Forged Racing Piston Assembly
EC Forged 72mm 2.835 Racing Piston Assembly
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EC 72mm / 2.835” Forged Racing Piston Assembly

Part Number: WC-200-K
Online Price: $89.99
Phone Order Price:$109.99
You Save:$20.00(18%)
EC 72mm Forged Racing Piston Assembly – Lightweight Slipper Skirt Design for High-Performance Builds
Availability: Out of Stock.

Description

EC 72mm / 2.835” Forged Racing Piston Assembly 

Precision-Engineered Lightweight Slipper Skirt Piston for 72mm Big Bore Racing Engines


The EC 72mm Forged Racing Piston is engineered for maximum strength, minimal weight, and optimal clearance in high-performance kart and mini bike engines. Forged from billet material and designed with an advanced slipper skirt design, this piston is ideal for aggressive racing applications and high-RPM performance.


Why Choose a Forged EC Racing Piston?

Unlike cast, billet, or hypereutectic pistons, forged pistons are formed by compressing solid billet aluminum under high pressure, realigning the metal's grain structure. The result is a piston with superior ductility, strength, and wear resistance—critical for endurance and high-output builds.


Design Advantages:

  • 72mm / 2.835” Bore Size – Designed to fit popular big-bore blocks such as Tillotson 225R, 228R, 236R/RX, 240RX, and Wildcat 240RS.
  • Racing Slipper Skirt Design – Reduces overall piston mass and increases clearance for longer stroke crankshafts.
  • Lower Compression Height – Compared to the Tillotson 72mm piston, this design allows the use of longer connecting rods and reduces total rotating assembly weight.
  • Anti-Friction Skirt Coating – Reduces wear and improves durability during extended high-RPM use.


Fitment Notes & Rod Compatibility:

Due to the shorter compression height, this piston will sit significantly lower in the bore with certain rods compared to the Tillotson piston. For example:

  • With 8279 rod and a 58mm crankshaft:
    • EC 72mm piston will sit over .100" in the hole
    • Tillotson 72mm piston sits near zero deck

To ensure proper deck height and compression, use the recommended rods and rotating assemblies below.


Recommended Pairings:

Tillotson 236cc (72mm Bore, 58mm Crankshaft):

  • Use Rod: #8290
  • Complete Rotating Assembly: #236RX-SKA
  • Complete Bottom-End Kit: #236RX-KIT

Tillotson 240cc (72mm Bore, 59mm Crankshaft):

  • Use Rod: #8289
  • Complete Rotating Assembly: #240RX-SKA
  • Complete Bottom-End Kit: #240RX-KIT


Piston Assembly Includes:

  • 1x 72mm / 2.835" Forged Racing Piston
  • 1x Set of 72mm Piston Rings
  • 1x 13mm Wrist Pin
  • 2x Wrist Pin Clips


Installation Support:

View our complete specification and installation guide for this piston:
WC-200 Piston Instructions

FAQ

EC 72mm Forged Racing Piston Assembly – Frequently Asked Questions (FAQ)


Q1: What engines is this 72mm forged piston compatible with?

A: This piston is designed for 72mm bore engines, including:

  • Tillotson 225R / RS
  • EC 228R
  • EC 236R / RX
  • EC 240RX
  • Wildcat 240RS

It is not compatible with 70mm or smaller bore engines like the Predator 212.


Q2: What makes a forged piston better than cast or billet pistons?

A: Forged pistons are made by compressing solid billet aluminum under extreme pressure, which realigns the grain structure. This process results in:

  • Greater strength
  • Higher durability under stress
  • Reduced weight
  • Better resistance to heat and fatigue compared to cast, billet, or hypereutectic pistons


Q3: What’s different about the slipper skirt design?

A: A slipper skirt piston has a reduced skirt area to:

  • Decrease overall weight
  • Increase clearance for long-stroke crankshafts
  • Reduce friction during operation
    It’s commonly used in racing applications for improved RPM response and efficiency.


Q4: Does the piston come with everything needed for installation?

A: Yes. The assembly includes:

  • 1x 72mm / 2.835” forged piston
  • 1x set of piston rings
  • 1x 13mm wrist pin
  • 2x wrist pin clips

?? You’ll still need to pair it with a compatible connecting rod and crankshaft for proper deck height.


Q5: What rod do I need to use with this piston?

A: Because this piston has a shorter compression height, it must be paired with a longer connecting rod than standard 72mm pistons. Recommended combinations:

  • For 236cc (72mm bore / 58mm crank): Use Rod #8290
  • For 240cc (72mm bore / 59mm crank): Use Rod #8289

You can also use our full kits:

  • 236RX-SKA (Rotating Assembly)
  • 236RX-KIT (Bottom-End Kit)
  • 240RX-SKA or 240RX-KIT


Q6: Will this piston work with my 8279 rod?

A: Technically, yes—but not ideally. Using an 8279 rod with a 58mm crank and this EC piston will place the piston over .100” in the hole, significantly reducing compression. For proper deck height and performance, use the recommended longer rods.


Q7: Is the piston coated?

A: Yes. The piston skirts are coated with an anti-friction surface treatment to reduce wear, minimize heat buildup, and extend piston life—especially beneficial for endurance racing.


Q8: Where can I find installation instructions?

A: A full installation and setup guide for this piston is available on our site:
?? WC-200 Forged Piston Instructions

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