Mikuni 004.487 Slow Speed Jet #142.5

The Mikuni 004.487 is a precision-manufactured slow speed jet with a #142.5 orifice size, designed for fine-tuning carburetor performance on motorcycles, ATVs, and other powersports applications. This jet controls fuel flow at idle and low throttle positions, making it essential for achieving optimal air-fuel mixture and smooth engine operation.

Key Features:

• Jet size: #142.5 for precise fuel metering
• Direct replacement for OEM Mikuni slow speed jets
• Precision-drilled orifice for consistent fuel delivery
• Manufactured to strict quality standards
• Compatible with various Mikuni carburetor models

Proper jetting is critical for engine performance, fuel economy, and throttle response. This slow speed jet allows you to dial in the perfect fuel mixture for your specific riding conditions, altitude, and temperature. Whether you're troubleshooting a lean or rich idle condition or optimizing your carburetor setup after modifications, this Mikuni jet provides the precision you need.