Brake Parts
Cooling Parts
Drivetrain & Transmission Parts
Electrical Parts
Engines Parts
Exhaust Parts
Foot Controls & Pegs
Frame & Body
Fuel Parts
Handlebars & Controls
Ignition System Parts
Mounts & Hardware
Performance Chips & Programmers
Racing Exterior & Body Parts
Starting & Charging Parts
Suspension Parts
Windshield & Fairings
Repair Manuals
Brake Parts
Cooling Parts
Drivetrain & Transmission Parts
Electrical Parts
Engines Parts
Exhaust Parts
Foot Controls & Pegs
Frame & Body
Fuel Parts
Handlebars & Controls
Ignition System Parts
Mounts & Hardware
Performance Chips & Programmers
Racing Exterior & Body Parts
Starting & Charging Parts
Suspension Parts
Windshield & Fairings
Repair Manuals
Mikuni Needle Jet
Fine-tune your carburetor’s midrange performance with a genuine Mikuni O-4 Needle Jet. Part number 784-231508-O-4 is engineered to provide precise fuel metering as the jet needle moves through the needle jet, helping maintain smooth throttle response and consistent fuel delivery. Mikuni needle jets are manufactured to tightly controlled specifications for dependable, repeatable carburetor tuning.
- Genuine Mikuni carburetor component - Precision fuel metering for consistent engine performance - Helps control the fuel mixture through approximately the 1/4 to 3/4 throttle range - O-4 sizing for application-specific carburetor calibration - Precision-manufactured for consistent flow characteristics - Direct replacement for compatible Mikuni carburetor applications - Ideal for carburetor rebuilding, restoration, and jetting adjustments
Includes:
- Mikuni Needle Jet (1)
Specs / Notes
- Manufacturer: Mikuni - Part Number: 784-231508-O-4 - Component Type: Needle Jet / Emulsion Tube - Jet Size: O-4 - Genuine Mikuni replacement component - Verify carburetor and vehicle application before installation - Changing needle-jet size affects midrange fuel mixture and may require additional carburetor tuning
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)).
WARNING: This product can expose you to chemicals including nickel, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
CLOSE ✕
Subscribe to our newsletter to receive exclusive offers, product recommendations, expert tips and more.