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Tillotson 225RS 72mm/2.835 Piston
Tillotson 225RS 72mm/2.835 Piston
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Tillotson 225RS 72mm/2.835 Piston

Part Number: 138220004
Online Price: $27.99
Phone Order Price:$29.99
You Save:$2.00(7%)
Tillotson 72mm Racing Piston – Hypereutectic Lightweight Slipper Skirt Design for 225RS, 228R, 236R & Wildcat 240
Availability: In Stock.

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Description

Tillotson Racing 72mm Hypereutectic Piston for 225RS Engines


Upgrade your engine’s performance with the Tillotson Racing 72mm Lightweight Hypereutectic Piston, designed specifically for the Tillotson 225RS, Tillotson 228R/236R, and Wildcat 240 race engines.


Important Note: This piston is often mistakenly marketed as forged. It is not a forged piston. While originally intended to be forged, Tillotson chose a hypereutectic casting to maintain performance while keeping costs down—making it an ideal balance of strength, weight, and value.


Key Features & Benefits:

  • High-Silicon Hypereutectic Alloy:
    Engineered with a high-silicon content for lower thermal expansion, allowing tighter tolerances for better cylinder sealing and long-term durability under race conditions.
  • Lightweight Slipper Skirt Design:
    The slipper-style skirt reduces weight and drag versus traditional barrel skirt pistons, improving efficiency and power output—especially at high RPMs.
  • Shorter Compression Height:
    The wrist pin location is optimized for performance, allowing use of a longer connecting rod, improving rod-to-stroke ratio and reducing side-loading and vibration.
  • Compact Wrist Pin Design:
    Uses a 13mm wrist pin (sold separately) to lower reciprocating weight and help balance the rotating assembly.
  • More Crank Clearance:
    The low-profile skirt design offers additional room for stroker crankshafts, making it ideal for high-displacement builds.


Engine Compatibility:

Engine

Stroke

Rod

Notes

Tillotson 228R

56mm

8275

Direct Fit

Tillotson 236R

58mm

8279

Direct Fit

Wildcat 240

59mm

8275

Direct Fit


What’s Included:

  • 72mm Hypereutectic Piston
    ?? Note: Piston rings, wrist pin, and circlips sold separately.


Why Choose the Tillotson 72mm Hypereutectic Piston?

Whether you're building for kart racing, mini bikes, or high-performance small engine applications, this piston provides the strength, lightweight construction, and advanced design features to help you unlock greater horsepower, torque, and reliability.

FAQ

Q: Is the Tillotson 72mm piston forged or cast?
A: It is a hypereutectic cast piston, not forged. While originally intended to be forged, it was cast to reduce cost without compromising racing performance.


Q: What’s the benefit of a hypereutectic piston?
A: Hypereutectic pistons have a higher silicon content, offering lower thermal expansion, tighter clearances, and improved durability over standard cast pistons.


Q: Does this piston include rings, wrist pin, or clips?
A: No. Rings, wrist pin (13mm), and circlips are sold separately.


Q: Will this fit a Predator 212 or Honda GX200?
A: No, this piston is not designed for 212cc or GX200 engines. It is designed for 72mm bore engines like the Tillotson 225RS, 228R, 236R, and Wildcat 240.


Q: What type of connecting rod do I need with this piston?
A: You’ll need a rod compatible with a 1.180" crank pin and a 13mm wrist pin. Use with rods like the EC 8275 or 8279 depending on stroke length.


Q: Can I use this piston with a stroker crankshaft?
A: Yes. The slipper skirt and reduced compression height give extra clearance, making it ideal for use with stroker crankshafts (56mm–59mm).


Q: What is the recommended ring size for this piston?
A: The piston is compatible with Tillotson 72mm low-tension racing rings:

  • Top: 1mm
  • Second: 1mm
  • Oil Control: 2mm

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