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  7. EC 236cc Stroker Kit Assembly – For Tillotson 72mm Block
EC 236cc Stroker Kit Assembly – For Tillotson 72mm Block
EC 236RX Stroker Kit Assembly Exploded Diagram
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EC 236cc Stroker Kit Assembly – For Tillotson 72mm Block

Part Number: 236RX-SKA
Online Price: $299.99
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Availability: In Stock.

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Description

EC 236cc Stroker Kit Assembly – For Tillotson 72mm Blocks


Take your engine performance to the next level with the EC 236RX Stroker Kit Assembly, purpose-built for the Tillotson 225R/RS 72mm bore blocks. This kit increases displacement from 223.93cc to 236.15cc (14.41ci)—giving your engine a power boost nearly equivalent to what the 225R gained over a 212cc platform.


When upgrading from a Predator 212 or Tillotson 212 (211.67cc), this stroker kit adds 24.48cc, a noticeable bump in torque, throttle response, and midrange pull—ideal for mini bikes, kart racing, and performance clone builds.


?? What’s Included:

  • EC Forged 72mm Piston (Coated Skirt)
    A durable, lightweight forged piston with skirt coatings to reduce friction and wear. Its shorter compression height allows for a longer rod and improved combustion geometry.
  • 58mm Stroker Crankshaft
    Increases stroke from stock to achieve 236.15cc of displacement. Balanced and precision-machined for reliability at high RPMs.
  • High-Strength Forged Connecting Rod (Long Rod)
    Designed to match the shorter piston height for optimal deck clearance and a smoother rod angle, enhancing power and reducing stress on the engine.

Block, bearings, gaskets, and camshaft not included. See our 236RX U-Build-It Kit for a complete bottom-end package.


Engine Compatibility:

  • Exclusively for Tillotson 225R/RS 72mm bore blocks
  • May physically fit other GX200-style engines that use a 72mm piston, but EC does not support or guarantee compatibility with non-Tillotson engines.


Important Camshaft Clearance Note:

Using a 58mm crankshaft in Predator 224, Wildcat 223, or EC stroker builds may require clearancing the camshaft, especially the compression release tab, to avoid interference with crankshaft counterweights.

We recommend using camshafts ground on a Predator 224 core, as these typically have revised compression releases that clear 58mm stroker cranks without modification.


Why Choose the EC 236RX Stroker Kit?

  • Boosts your Tillotson 225R/RS engine to 236.15cc
  • Adds over 24cc of displacement compared to Predator/Tillotson 212 engines
  • Forged piston with coated skirts for strength and reduced wear
  • Improved rod ratio and optimized deck height for efficient combustion
  • Proven performance upgrade over the original 236R kit
  • Compatible with high-lift camshafts (clearance may be required)


Recommended Add-On:

For those building from scratch, choose the 236RX U-Build-It Kit, which includes a 72mm Tillotson block, bearings, gaskets, and hardware to complete your bottom end with this rotating assembly.

FAQ

FAQ – EC 236cc Stroker Kit Assembly


Q1: What engines is this stroker kit designed for?

A: This kit is specifically designed for the Tillotson 225R and RS engines with a 72mm bore. While it may fit other clone or Honda GX200-based engines, EC does not support non-Tillotson applications.


Q2: What does the 236cc stroker kit include?

A: The kit includes:

  • EC forged 72mm piston with coated skirts
  • 58mm stroker crankshaft
  • Forged long connecting rod
    Block, camshaft, gaskets, and bearings are not included.


Q3: What is the final displacement using this kit?

A: It increases displacement from 223.93cc to 236.15cc, or 14.41 cubic inches. That’s an increase of over 24cc compared to a standard 212cc engine, giving you more low-end torque and stronger midrange power.


Q4: Will I need to modify any components for this kit to fit?

A: Possibly. If you’re using a camshaft with a compression release, you may need to clearance the cam tab to avoid interference with the 58mm crankshaft counterweights. Using a cam ground on a 224 core often avoids this issue.


Q5: Do you offer a complete engine kit with this rotating assembly?

A: Yes! We offer the 236RX U-Build-It Kit, which includes the same rotating assembly along with the Tillotson 72mm block, gaskets, bearings, and hardware to complete a full short block.

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