Mikuni Large Round Main Jets - 4/PK #187.5

Mikuni large round main jets in size #187.5, sold as a 4-pack for V-twin carburetors. These genuine Mikuni jets meter fuel flow at cruise and part-throttle conditions and are essential for proper carburetor tuning on Harley-Davidson and Indian Motorcycle models.

Features

• Size #187.5 large round main jet
• 4-pack quantity
• Genuine Mikuni OEM component
• Designed for V-twin carburetors

Specifications

• Brand: Mikuni
• Manufacturer Part #: FN100604-187.5
• Jet Size: #187.5
• 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 V-twin motorcycles equipped with Mikuni carburetors, including Harley-Davidson and Indian Motorcycle models.

Frequently Asked Questions

What size jet is this?

Size #187.5 — a large round main jet for cruise and part-throttle metering. Check your carb specs to confirm it's the right size for your bike.

Why are these sold in a 4-pack?

Four jets allow you to service multiple carburetors, keep spares on hand, or experiment with jetting during carburetor tuning.

Will this fit my Harley or Indian?

If your bike runs a Mikuni carburetor, yes — this is a direct Mikuni replacement jet. Verify your carb model and stock jet size before ordering.

Do I need any special tools to install these?

Mikuni jets require a small wrench or socket to remove and install. Most riders use standard motorcycle carburetor tools.