Mikuni Large Round Main Jets - 4/PK #127.5

Genuine Mikuni large round main jets sized #127.5, sold in a 4-pack for V-twin motorcycle carburetors. These jets meter fuel flow at cruise and part-throttle, and are essential for proper jetting when tuning a Harley or Indian carburetor.

Features

• 4-pack quantity
• Genuine Mikuni large round design
• #127.5 orifice size

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-127.5
• Quantity: 4 per pack
• Country of Origin: Japan

Fitment

Fits V-twin motorcycles equipped with Mikuni carburetors using large round main jets.

Frequently Asked Questions

What size is the #127.5 jet?

#127.5 is the orifice diameter in hundredths of a millimeter — a mid-range main jet for most stock and mildly modified V-twin engines.

How do I know if I need larger or smaller jets?

Larger jets richen the fuel mixture; smaller jets lean it out. Consult your carburetor tuning guide or dyno shop for your specific engine and altitude.

Will these fit my Harley or Indian?

Yes, if your bike runs a Mikuni carburetor with large round main jets. Check your carb model and existing jet size before ordering.

Why buy a 4-pack?

Four jets give you spares and let you test different sizes during jetting without waiting for reorders — useful for tuning and backup.