Mikuni Large Round Main Jets - 4/PK #85

Genuine Mikuni large round main jets #85 for V-twin motorcycle carburetors, sold in a 4-pack. These jets meter fuel flow at cruise and part-throttle conditions and are essential tuning components for Harley-Davidson and Indian Motorcycle carb setups.

Features

• 4-pack quantity
• Genuine Mikuni OEM part
• Large round jet body
• #85 main jet size

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-85
• Quantity: 4 per pack
• Jet Size: #85
• Length: 6.2 in
• Width: 3.95 in
• Height: 0.65 in
• Weight: 0.01 lbs
• Country of Origin: Japan

Fitment

Fits V-twin motorcycles with carburetors using Mikuni large round jets, including many Harley-Davidson and Indian Motorcycle models.

Frequently Asked Questions

What do main jets do in a carburetor?

Main jets meter fuel flow during cruise and part-throttle riding. Changing jet size fine-tunes the air-fuel mixture for your engine and altitude.

How do I know if I need a #85 jet?

Check your carb manual or existing jet size. If you've changed air intake or ignition, you may need to upsize or downsize for proper mixture.

Why buy a 4-pack?

Four jets cover a pair of carbs (two per carb) plus spares. Having backups prevents downtime if a jet gets stuck or damaged.

Are these genuine Mikuni?

Yes — these are OEM Mikuni parts, not aftermarket copies. Manufactured in Japan to original specifications.