Mikuni Large Round Main Jets - 4/PK #75

Mikuni large round main jets sized #75 for V-twin carburetor tuning, sold in a four-pack. These genuine Mikuni jets adjust fuel flow at mid and high throttle positions to optimize engine performance and fuel economy on carbureted Harley-Davidson and Indian Motorcycle models.

Features

• Genuine Mikuni OEM jets
• #75 size — mid-to-high throttle fuel metering
• 4-pack quantity
• Large round body design

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-75
• Quantity: 4 per pack
• Jet Size: #75
• 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 select Harley-Davidson and Indian Motorcycle models with large round jet bodies.

Frequently Asked Questions

What does a #75 main jet do?

A #75 main jet meters fuel at mid-to-high throttle openings. Larger numbers = richer fuel mixture; smaller numbers = leaner mixture.

Do I need all four jets at once, or do I use one?

You install one jet in your carburetor at a time. The four-pack lets you test different jet sizes without reordering to dial in your engine's ideal fuel mixture.

How do I know if I need a #75 over a #70 or #80?

Jet selection depends on your engine size, altitude, intake modifications, and exhaust setup. Consult your carburetor tuning guide or test at the drag strip to find the best size for your bike.

Are these the same as the OEM Harley jets?

No — these are genuine Mikuni jets. Harley and Indian use different carburetor brands and jet specifications depending on model year.