Mikuni Large Round Main Jets - 4/PK #140

Genuine Mikuni large round main jets, size #140, sold in a 4-pack for carbureted V-twin motorcycles. These jets meter fuel flow through the main circuit and are essential for proper jetting when changing altitude, air filters, or exhaust systems.

Features

• Size #140 main jet
• 4-pack quantity
• Genuine Mikuni OEM component
• Large round body design

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-140
• Quantity: 4 per pack
• Jet Size: #140
• Country of Origin: Japan

Fitment

Fits V-twin motorcycles with Mikuni carburetors, including Harley-Davidson and Indian Motorcycle models.

Frequently Asked Questions

What size jet do I need for my bike?

Jetting depends on altitude, air filter, and exhaust modifications. Consult your carburetor tuning guide or work with a shop to verify the correct size.

How many jets are in a pack?

Four jets per pack — enough for multiple carburetors or to keep spares.

Will this fit my Harley with a Mikuni carburetor?

Yes, if your Harley uses a Mikuni carb. Check your carb brand and model before ordering to confirm compatibility.

Do I need special tools to install a jet?

You'll need a carburetor removal tool and a small screwdriver to access the jet tube inside the bowl. Consider professional tuning if you're unfamiliar with carb work.