Mikuni Large Round Main Jets - 4/PK #115

Genuine Mikuni large round main jets in #115 orifice size, sold in a 4-pack for carburetor tuning on V-twin motorcycles. These jets meter fuel delivery at cruise and part-throttle engine speeds.

Features

• 4-pack quantity
• Genuine Mikuni OEM jets
• Large round body style
• #115 orifice size

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-115
• Quantity: 4 per pack
• Orifice Size: #115
• 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 using large round main jets.

Frequently Asked Questions

What does a main jet do?

The main jet meters fuel flow at cruise and part-throttle speeds. Changing jet size fine-tunes air-fuel ratio for your engine's load and elevation.

How do I know if I need a #115?

Check your carburetor's current jet size and your bike's jetting chart. A #115 is a mid-range size; go up in size for richer mixture, down for leaner.

Are these the correct size for my Harley or Indian?

Mikuni main jet compatibility varies by carburetor model and year. Verify your carb type and current jet size before ordering.

Can I mix different jet sizes?

Yes — it's common to run different jet sizes in different cylinders or carbs to balance fueling across the engine.

What's included in the 4-pack?

Four #115 main jets in the large round body style. Enough for two complete carburetors or spares.