Weber Primary Idle Jet | Fat Jet
Weber calibrated primary idle jets "fat jets" are an essential component for fine-tuning your downdraft carburetor, precisely metering fuel during idle and low-speed transition. Recognized worldwide as the premier choice for performance applications, genuine Weber jets deliver exceptional throttle response and improved fuel efficiency when properly tuned. Fine-tuning your primary idle circuit allows you to tailor performance specifically to your engine's unique demands, local attitude, and atmospheric conditions.
Key Features
- Precision Fuel Metering: Accurately controls fuel delivery through the primary idle circuit for smooth idling and crisp off-idle throttle response.
- Peak Engine Performance: Enables custom carburetor tuning to match your specific engine build, performance modifications and driving conditions.
- Altitude & Climate Tuning: Essential for adjusting low-speed air/fuel ratios to compensate for elevation changes and weather variations.
- Value & Fuel Efficiency: Delivers optimal fuel atomization for maximum drivability without wasting fuel.
Specifications & Technical Notes
- Brand: Weber
- Component Type: Primary Idle Jet ("Fat Jet")
- Size Range: 0.40 mm – 0.90 mm
- Application: Weber Downdraft Performance Carburetors
- Important Carburetor Compatibility Note: Weber Manual Choke carburetors use two secondary ("skinny") idle jets instead of one primary and one secondary.
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