Mikuni Large Round Main Carburetor Jet Jets

Mikuni Large Round Main Jets (N100.604 type) are replacement main jets for Mikuni carburetors. They let you fine-tune fuel metering at mid-to-full throttle. The main jet is a key part of carburetor tuning. Changing jet size adjusts the air/fuel mixture to suit your engine, altitude, temperature, and modifications such as exhaust or intake upgrades.

Key Features:

• Large round head style, used in Mikuni RS, HS, HSR, and TM series carburetors, and in other Mikuni carburetors that use this jet type
• Genuine Mikuni construction, manufactured in Japan
• Precision-machined brass jet for accurate, repeatable fuel flow
• Available in a range of jet numbers so you can dial in jetting for your setup
• Easy to install and swap during carburetor tuning or rebuilds

Mikuni is a long-established maker of carburetors and fuel system components for motorcycles, ATVs, snowmobiles, and other powersports and industrial engines. Choose the jet number you need from the options on this page to restore or optimize carburetor performance.