Mikuni Jet Needle - Hsr42 Leaner

Mikuni jet needle for HSR42 carburetors with a leaner taper designed to reduce fuel delivery in the mid-range throttle range. Direct replacement for Mikuni HSR42 carburetor assemblies on V-twin motorcycles.

Features

• Leaner taper for mid-range fuel reduction
• Direct Mikuni HSR42 replacement
• 4.4 in length

Specifications

• Brand: Mikuni
• Manufacturer Part #: FJ8-8DDY01-98
• Length: 4.4 in
• Width: 1.9 in
• Height: 0.4 in
• Weight: 0.05 lbs
• Country of Origin: Japan

Fitment

Fits Mikuni HSR42 carburetors commonly used on V-twin motorcycles.

Frequently Asked Questions

What does a leaner jet needle do?

A leaner taper reduces fuel flow in the mid-range throttle position, helping you dial out a rich condition between cruise and wide-open throttle.

Will this fit my HSR42 carburetor?

Yes — this is a direct Mikuni replacement for HSR42 assemblies. Verify your carb model before ordering.

Is installation difficult?

Jet needle replacement requires removing the carburetor and accessing the needle clip inside the slide. Carburetor experience or a service manual is recommended.

Can I mix this needle with other Mikuni needles?

Jet needles are tuning-specific. Swapping needles changes jetting significantly — use only the needle specified for your fuel and engine setup.