Mikuni Large Round Main Jets - 4/PK #155

Mikuni large round main jets #155 for V-twin motorcycles, sold in a 4-pack. These genuine Mikuni jets are used to dial in fuel delivery at full throttle in Harley and Indian carburetors.

Features

• 4-pack quantity
• Genuine Mikuni large round main jets
• Size #155 specification

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-155
• Quantity: 4 per pack
• Jet Size: #155
• 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 that use large round main jets.

Frequently Asked Questions

What size jets are these?

#155 Mikuni large round main jets — the size number refers to the fuel orifice diameter and flow rate.

How many jets are in a pack?

Four jets per pack, so you have spares or can jet multiple carbs.

Will these fit my carburetor?

These fit Mikuni carburetors on V-twin motorcycles. Verify your carb model uses large round jets before ordering — some older or custom setups use different jet styles.

Do I need to change jets for performance modifications?

Yes — if you add an aftermarket intake, exhaust, or air filter, rejetting is often needed to keep the air-fuel ratio correct at wide-open throttle.