Mikuni Large Round Main Jets - 4/PK #135

Genuine Mikuni large round main jets in size #135, sold in a 4-pack for V-twin motorcycle carburetor tuning. These jets meter fuel flow at cruise and mid-range throttle, making them essential for dialing in air/fuel ratio after intake or exhaust modifications.

Features

• Size #135 main jet
• 4-pack quantity
• Genuine Mikuni OEM part
• Large round body design

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-135
• Quantity: 4 per pack
• Jet Size: #135
• Country of Origin: Japan

Fitment

Fits V-twin motorcycles with Mikuni carburetors that accept large round main jets. Verify your carburetor model and current jet size before ordering.

Frequently Asked Questions

What size main jet do I need?

Main jet size depends on your carburetor model, altitude, and air intake modifications. Check your carb manual or consult a tuning guide for your specific bike.

Why would I need to change main jets?

Upgrading to a larger air filter, intake, or exhaust often requires a richer main jet to prevent a lean condition and maintain performance.

How many jets come in a pack?

Four jets per pack — enough for a single carb with spares, or split between two-carb setups.

Will these fit my Harley or Indian?

These fit V-twin bikes running Mikuni carburetors. Stock Harley and Indian models use OEM carbs — verify compatibility before ordering.