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Intimidator XR-25 1-Inch Limited Modified Carburetor Kit for Honda GX200/Clone/Predator
XR-28 28mm Intimidator Carburetor for Honda GX200/Tillotson/Predator on Methanol
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Intimidator XR-25 1-Inch Limited Modified Carburetor Kit for Honda GX200/Clone/Predator

Part Number: XR-25-1K
Online Price: $450.00
Phone Order Price:$599.99
You Save:$149.99(25%)
EC XR-25 Intimidator Billet 1.00” Methanol Carburetor Built for 208cc Limited Modified Clone Racing Engines Engineered specifically for modern high-RPM methanol racing engines, the EC XR-25 Intimidator is the next evolution in diaphragm-style carburetors for the 208cc Limited Modified Clone class. Designed as a direct alternative to the increasingly scarce Tillotson HL-304WX, the XR-25 meets the same class intent while delivering improved durability, consistency, and race-ready blueprinting. The 208cc Limited Modified Clone Class was developed in collaboration with Jerry Welch (Welch Performance) and DynoCams. The XR-25 was purpose-built to support the newly defined 208cc Limited Modified Clone class, ensuring racers have a reliable, competitive, and legal carburetor option moving forward. Purpose-Built for 208cc Limited Modified Methanol Engines The XR-25 is optimized for pure methanol operation on modern 208cc clone engines running 70mm bore × 54mm stroke combinations. While maintaining the same airflow intent as the HL-304WX, the XR-25 allowed EC to refine internal fuel circuits, strengthen critical components, and apply consistent CNC blueprinting—advantages not possible with legacy cast carburetors. This carburetor is not a universal replacement—it is a class-focused racing component engineered for controlled airflow, clean fuel delivery, and repeatable tuning under race conditions. Key Features of the EC XR-25 Intimidator CNC Billet Body & Pump Stack Fully machined from billet aluminum for precise fuel metering, increased rigidity, and superior durability compared to cast carburetors. The billet construction ensures consistent internal geometry and long service life. Optimized Methanol Fuel Flow Designed exclusively for pure methanol, the XR-25 delivers strong mid-to-top end power while reducing fuel overrun at idle—critical for maintaining oil quality and ring seal in high-RPM racing engines. Upgraded 6mm Stainless Steel Throttle Shaft Stronger and more wear-resistant than the 5.5mm brass shafts commonly found in Tillotson HL carburetors. Built to survive aggressive throttle action and sustained high RPM. Hand-Assembled & Blueprinted in the USA Every XR-25 is CNC-machined and hand-assembled in Tennessee, USA. No mass production—each carburetor is race-ready out of the box with consistent internal tolerances. Integrated Stud-Mount Design Simplifies installation and reduces mounting hardware. Designed specifically to pair with EC XR-Series billet intake manifolds for optimal signal strength and fuel delivery. Expandable XR-Series Platform For non-limited classes requiring additional airflow, the XR platform is also available in: * XR-28 (28mm) * XR-30 (30mm) * XR-32 (32mm) XR-25-1K Intimidator Carburetor Kit Includes * XR-25 Billet Diaphragm Carburetor?1.00” Bore / .900” Venturi * 494INT Billet Intake Manifold Kit * Intake & carb gaskets * Mounting hardware * Pulse fitting * EC Air Filter * External Fuel Pump Application & Fitment Designed For * 208cc Limited Modified Clone Engines?(70mm Bore × 54mm Stroke – verify class rules) * Standard valve or ported cast cylinder heads Fuel Type * Pure Methanol ONLY * ? No top-lube methanol * ? No E85 * ? No pump gas Recommended Fuel System Setup Approved Fuel Pumps * Walbro FPC-1 * EC TFPC-1 or TFPC-2 NOT Supported * Briggs & Stratton fuel pumps * Mikuni or Mikuni-style knockoffs * Plastic Walbro WIP knockoffs * Electric fuel pumps Proper pulse signal and fuel volume are critical—do not substitute components. Baseline Tuning Reference * High-Speed Needle: 1 turn out * Low-Speed Needle: 2.5 turns out?(Fine-tune for elevation, temperature, and engine setup) Important Methanol Tuning Notes * Do not idle the engine * Diaphragm carbs on methanol run very rich at idle * Over-leaning the low side can cause hesitation or mid-range bog * Set idle speed screw so the butterfly just rests against the bore * Prevent stalling with light throttle blips to: * Reduce fuel overrun * Prevent cylinder wash * Minimize fuel contamination in oil Pop-Off & Setup Specs * Pop-Off Pressure: 8.5–10 PSI * Fulcrum Arm Height: .065” Important Notes * Requires a dedicated XR-Series intake, pulse-style fuel pump, and remote fuel system * Will not function correctly with stock clone fuel systems * Compatible with EC 494INT XR-Series billet intakes only
Availability: In Stock.

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Description

EC XR-28 Intimidator Billet 28mm Methanol Carburetor – Built for Big Valve, Ported Race Engines


Engineered for modern racing engines running pure methanol, the EC XR-28 Intimidator is the next evolution in diaphragm-style carburetors. Designed to replace the Tillotson HL-380 and upgrade from the previous Intimidator X380, the XR-Series delivers unmatched performance, improved durability, and cleaner, more efficient fuel delivery—purpose-built for today's high-RPM, big-displacement small engines.


Purpose-Built for High-Performance Methanol Engines

With growing demand from advanced cylinder head designs and increased engine displacements, traditional diaphragm carburetors fall short. The XR-Series was built from scratch using billet construction to overcome the fuel delivery, durability, and tuning limitations of legacy carburetors.


Key Features of the EC XR-28 Intimidator Carburetor:

  • CNC-Billet Body & Pump Stack
    Fully machined from billet aluminum for precision fuel metering, improved strength, and a clean, professional appearance.
  • High-Volume Fuel Flow
    Optimized for pure methanol use—delivers consistent power across the RPM range while minimizing fuel overrun at idle.
  • Reduced Crankcase Dilution & Cylinder Wash
    Helps prevent common methanol issues like oil washout and poor ring seal—improves lubrication, reduces windage losses, and enhances power output.
  • Upgraded 6mm Stainless Throttle Shaft
    Stronger and more durable than the standard 5.5mm brass shafts used in Tillotson HLs. Built to withstand high-RPM racing abuse.
  • Hand-Assembled & Blueprinted in the USA
    Each unit is CNC-machined and carefully assembled in Tennessee—not mass-produced, giving you consistent, race-grade quality.
  • Integrated Stud Mounting Design
    Fewer mounting components needed. Designed to work with EC’s dedicated XR-series billet intakes.
  • Expanded Sizing Options
    If your application needs more airflow, consider the XR-30 (30mm) or XR-32 (32mm) from the same lineup.


Application Fitment:

The XR-28-1 is designed for:

  • Big Valve & Ported Cast Cylinder Heads
  • Engines:
    • Honda GX200
    • Predator 212 / 224
    • Wildcat 223 / 240
    • Tillotson 196cc – 268cc

Fuel Type: Pure Methanol ONLY

  • Do NOT use top-lube methanol
  • Not compatible with ethanol blends like E85 or pump gas (E91)


Recommended Fuel System Setup:

  • Approved Fuel Pumps:
    Walbro FPC-1 or TFPC-1 only
  • NOT Supported:
    Briggs & Stratton fuel pumps
    Mikuni or Mikuni-style knockoffs
    Plastic Walbro WIP knockoffs
    Electric fuel pumps


Tuning Reference (Initial Settings):

  • High Side Needle: 1 turn out
  • Low Side Needle: 2.5 turns out
    (Adjust based on elevation, temperature, and engine configuration.)


Important Notes:

  • Will not work with stock fuel systems.
    This carburetor requires a dedicated intake, proper pulse-style fuel pump, and remote fuel setup for optimal operation.
  • Compatible Intakes: Custom XR-series intakes available from EC.

FAQ

Is the EC XR-25 legal for 208cc Limited Modified Clone classes?

The XR-25 was developed specifically to meet the intent of the 208cc Limited Modified Clone class as an alternative to the Tillotson HL-304WX. Always verify legality with your specific sanctioning body before competition.


What carburetor does the XR-25 replace?

The XR-25 is designed as a modern billet alternative to the Tillotson HL-304WX, which has become increasingly difficult to source.


What fuel can I run with the XR-25?

Pure methanol ONLY.

  • ? No top-lube methanol
  • ? No E85
  • ? No pump gas

Running incorrect fuel will cause poor performance and potential engine damage.


Can I use my stock clone fuel pump?

No. The XR-25 requires a pulse-style external fuel pump.

Approved pumps:

  • Walbro FPC-1
  • EC TFPC-1 or TFPC-2

Not supported:

  • Briggs fuel pumps
  • Mikuni or Mikuni-style pumps
  • Plastic Walbro WIP knockoffs
  • Electric fuel pumps


Does this carburetor work with stock intakes?

No. The XR-25 must be used with EC XR-Series billet intake manifolds, such as the included 494INT intake.


What engines is the XR-25 designed for?

  • 208cc Limited Modified clone engines
  • 70mm bore × 54mm stroke combinations
  • Standard valve or ported cast cylinder heads

Not intended for stock or box-stock clone engines.


What pop-off pressure should I run?

Recommended pop-off pressure is 8.5–10 PSI for proper fuel delivery and throttle response.


What are the baseline needle settings?

  • High-speed needle: 1 turn out
  • Low-speed needle: 2.5 turns out

Fine-tune based on elevation, temperature, and engine configuration.


Should I let the engine idle with this carburetor?

No. Diaphragm carburetors on methanol run extremely rich at idle.

  • Do not idle for extended periods
  • Use light throttle blips to prevent stalling
  • Helps avoid cylinder wash and oil contamination


Is the XR-25 rebuildable?

Yes. The XR-25 is fully serviceable and rebuildable using XR-series internal components.


Where is the XR-25 manufactured?

The XR-25 is CNC-machined and hand-assembled in Tennessee, USA.


Can I upgrade to a larger XR-series carb later?

Yes. The XR platform includes:

  • XR-28 (28mm)
  • XR-30 (30mm)
  • XR-32 (32mm)

These are intended for non-limited or open racing classes.

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