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Tillotson HR-181 Blueprinted Methanol Carburetor for Modified 2-Cycle Engines
HR-181 Tillotson 2-cycle Blueprinted Methanol Carburetor
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Tillotson HR-181 Blueprinted Methanol Carburetor for Modified 2-Cycle Engines

Part Number: HR- 181B-A
Online Price: $400.00
Tillotson HR-181 Blueprinted Methanol Carburetor for Modified 125cc+ 2-Cycle Engines
Availability: In Stock.

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Description

Tillotson HR-181 Blueprinted Methanol Carburetor


For Modified 125cc+ 2-Cycle Rotary & Reed Valve Engines


The Tillotson HR-181 Blueprinted Methanol Carburetor is a high-performance, race-prepped diaphragm carburetor designed for modified 125cc and larger 2-cycle engines, including rotary valve and reed valve configurations. Blueprinted for methanol fuel, this carburetor delivers the precise fuel flow, throttle response, and top-end power that competitive 2-stroke racers demand.


Engineered from the proven HR-series platform, the HR-181 is internally optimized for methanol, with enlarged passages, modified fuel circuits, and carefully balanced metering to support the higher demands of aggressive race builds. Whether you're running a 2-cycle kart, snowmobile, or performance marine engine, this carb ensures maximum performance under extreme conditions.


If you're racing in open or modified classes and running methanol in a high-output engine, the HR-181 is the professional’s choice.


Key Features:

  • Blueprinted for methanol fuel – not compatible with gasoline
  • Based on the legendary Tillotson HR-series diaphragm design
  • Ideal for 125cc+ 2-cycle rotary valve and reed valve engines
  • Modified internally for enhanced fuel flow and top-end delivery
  • Delivers consistent performance under high RPM and cornering loads
  • Race-proven in karting, snowmobile, marine, and other 2-stroke motorsports
  • Easy to tune for varying track and environmental conditions


Maximize your 2-stroke engine’s potential with the Tillotson HR-181 Blueprinted Methanol Carburetor—engineered to dominate in high-performance racing environments where precision and power matter most.

FAQ

Q1: What types of engines is the HR-181 blueprint carburetor designed for?

A: The HR-181 is specifically blueprint modified for 125cc and larger 2-cycle engines, including rotary valve and reed valve designs used in karting, snowmobiles, and other racing platforms.


Q2: Can this carburetor be used with gasoline?

A: No. The HR-181 in this configuration is blueprinted for methanol only. Using gasoline may result in improper tuning, performance loss, or internal damage.


Q3: What are the benefits of blueprinting a Tillotson carburetor?

A: Blueprinting ensures:

  • Precision fuel delivery for specific fuels (methanol in this case)
  • Improved throttle response and fuel atomization
  • Consistency across throttle ranges and RPM
    It’s tailored to competitive racing needs, far beyond factory specs.


Q4: Is this carburetor legal for spec or stock classes?

A: No. The HR-181 blueprint carb is intended for open, modified, or unlimited classes where internal modifications and methanol fuel are permitted.



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