Mikuni Large Round Main Jets - 4/PK #150

Genuine Mikuni large round main jets (#150) for V-twin motorcycle carburetors, sold in a 4-pack. These jets control fuel flow at cruise and part-throttle operation and are essential for carburetor tuning on Harley-Davidson and Indian Motorcycle engines.

Features

• Genuine Mikuni OEM jets
• 4-pack quantity
• #150 size designation
• Precision-machined orifice

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-150
• Quantity: 4 per pack
• Jet Size: #150
• Length: 4.4 in
• Width: 2.2 in
• Height: 0.6 in
• Weight: 0.05 lbs
• Country of Origin: Japan

Fitment

Fits V-twin motorcycles with Mikuni carburetors, including Harley-Davidson and Indian Motorcycle models. Verify your carburetor model and jet size before ordering.

Frequently Asked Questions

What do main jets do in a carburetor?

Main jets meter fuel at cruise and part-throttle riding. Larger numbers (#150, #160, etc.) allow more fuel; smaller numbers restrict it for leaner running.

How do I know which jet size I need?

Consult your carburetor documentation or your tuner. Wrong jet sizing can cause lean/rich running and poor performance.

Why buy a 4-pack?

A four-pack covers a complete carburetor set on a two-carb system with spares, or allows you to try different sizes during tuning.

Are these genuine Mikuni?

Yes — these are OEM Mikuni jets distributed through Western Power Sports.