Mikuni Large Round Main Jets - 4/PK #87.5

Genuine Mikuni large round main jets sized #87.5 for V-twin motorcycle carburetors, sold in a 4-pack. These control fuel delivery at cruise and part-throttle RPM on Mikuni carbs used in Harley-Davidson and Indian Motorcycle applications.

Features

• Genuine Mikuni OEM part
• Size #87.5 large round main jet
• 4-pack quantity
• Precision-machined orifice

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-87.5
• Quantity: 4 per pack
• Length: 4.4 in
• Width: 2.2 in
• Height: 0.6 in
• Weight: 0.05 lbs
• Country of Origin: Japan

Fitment

Fits Harley-Davidson and Indian Motorcycle models equipped with Mikuni large round carburetors. Verify your carb type and current jet size before ordering.

Frequently Asked Questions

What's the difference between main jets and other jets?

Main jets meter fuel at cruise and part-throttle. Pilot jets handle idle and low-speed running. Choose the correct jet type for your carb.

How do I know if #87.5 is the right size for my bike?

Check your carburetor documentation or current jet markings. Larger numbers = richer mixture. Start with OEM specs and adjust if needed.

Why are these sold in 4-packs?

Four jets cover multiple carbs on twin-cylinder bikes or allow spares for tuning and testing different sizes.

Do I need special tools to change jets?

You'll need a carb bowl gasket kit and basic hand tools. Drain fuel, remove the bowl, and swap the old jet for the new one.