Mikuni Jet Needle Standard - HSR42 Carburetor
About Mikuni
Mikuni has supplied carburetors and fuel-system components to the motorcycle industry for decades, and its HSR series remains a common choice for carbureted Evolution and Twin Cam V-twins where a clean, tunable fuel curve matters more than electronics.
The Mikuni standard jet needle for HSR42 carburetors is a precision-tapered component critical for metering fuel flow at mid-range and cruise throttle positions. As a direct OEM replacement, it's essential for maintaining proper V-twin carb tuning and jetting adjustments.
Why riders pick this
- Standard taper for HSR42 Mikuni carbs
- OEM Mikuni direct replacement
- Precision tapered design for fueling
- Maintains mid-range and cruise throttle fuel
A worn or incorrect jet needle can significantly impact your Harley or Indian V-twin's performance and fuel economy. This genuine Mikuni standard jet needle ensures accurate fuel delivery through the critical mid-range. It's an exact replacement for the original needle in HSR42 carburetors, making it ideal for routine maintenance or restoring factory-spec performance.
Reliable Mid-Range Fueling
- Standard taper profile for Mikuni HSR42 carburetors
- Direct OEM Mikuni replacement part
- Precision design for consistent fuel metering
- Crucial for mid-range and cruise throttle positions
Essential for Carburetor Health
Maintaining your carburetor's internal components, like the jet needle, is key to consistent engine performance. This standard needle provides the baseline fuel metering for HSR42 carbs, making it suitable for stock or mildly modified V-twins. If you're experiencing inconsistent mid-range power or fuel efficiency, a fresh, correctly specified jet needle can often resolve these issues, ensuring your bike runs smoothly.
Specifications
- Brand: Mikuni
- Manufacturer Part #: FJ8-8DDY01-97
- Length: 4.4 in
- Width: 1.9 in
- Height: 0.4 in
- Weight: 0.05 lbs
- Country of Origin: Japan
Common questions
Will this standard jet needle fit my Mikuni HSR42 carburetor?
Yes, this is the genuine OEM Mikuni jet needle (part number FJ8-8DDY01-97) specifically designed for HSR42 carburetors.
What is the primary function of a jet needle in a carburetor?
The tapered jet needle controls the amount of fuel allowed into the engine from the main jet at mid-range and cruise throttle positions. Swapping needles is a common tuning step to lean out or richen this specific operating zone.
Is this a direct replacement part, or does it require modifications?
This is a direct OEM Mikuni replacement part. It is designed to drop into any HSR42 carburetor without requiring any modifications for installation.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Mikuni |
| TYPE | Intake/Carb/Fuel System |
| SKU | 14-2506 |
| WEIGHT | 0.05 lb |
