Mikuni Large Round Main Jets - 4/PK #145

Genuine Mikuni large round main jets in size #145, sold in a 4-pack for carburetor tuning on V-twin motorcycles. Mikuni jets meter fuel precisely during mid-to-full throttle cruising and acceleration.

Features

• Size #145 main jet
• 4-pack quantity
• Genuine Mikuni OEM part
• Large round head design

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-145
• 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 V-twin motorcycles with Mikuni carburetors. Verify your current jet size before ordering to ensure correct tuning.

Frequently Asked Questions

What does a main jet do?

The main jet meters fuel during mid-range and full-throttle operation. Larger numbers allow more fuel; smaller numbers lean out the mixture.

How do I know if I need a #145 jet?

Check your carb's current jet size or consult your motorcycle's tuning guide. Jetting depends on altitude, air temperature, and modifications.

Are these genuine Mikuni parts?

Yes — these are OEM Mikuni jets distributed by Western Power Sports.

Do I need any special tools to install?

A carburetor removal kit and screwdrivers help access the float bowl where the main jet is located. Some bikes require partial engine cover removal.