Mikuni Large Round Main Jets #187.5 4-Pack - Harley & Indian V-Twin
About Mikuni
Mikuni has supplied carburetors and fuel-system components to the motorcycle industry for decades, and its HSR series remains a common choice for carbureted Evolution and Twin Cam V-twins where a clean, tunable fuel curve matters more than electronics.
Achieve precise fuel metering on your carbureted V-twin with this 4-pack of genuine Mikuni Large Round Main Jets. Sized at #187.5, these jets are engineered to control fuel flow at cruise and part-throttle conditions. They are a vital component for proper carburetor tuning on Harley-Davidson and Indian Motorcycle models.
Why riders pick this
- Genuine Mikuni OEM quality for reliable performance
- Specific #187.5 main jet size for precise fuel metering
- Ideal for V-twin motorcycles with large round Mikuni carburetors
- 4-pack for comprehensive tuning, spares, or multiple bikes
When you're serious about optimizing your V-twin's performance, accurate carburetor tuning is paramount. These Mikuni Large Round Main Jets, in a #187.5 size, provide the precise step in fuel enrichment often necessary after engine modifications or to compensate for environmental factors. As genuine Mikuni OEM components, they deliver the consistent quality and accuracy that discerning riders demand for their Harley-Davidson and Indian Motorcycle engines.
Refined Fuel Delivery for V-Twins
- Genuine Mikuni OEM component for assured quality
- #187.5 main jet size for precise fuel metering
- Designed for V-twin carburetors accepting large round main jets
- 4-pack quantity supports comprehensive tuning and spares
Tuning for Peak Performance
The #187.5 main jet offers a critical adjustment point for your V-twin's fuel mixture, helping to prevent lean conditions and ensure optimal power output. Proper jetting contributes to smoother throttle response, improved efficiency, and overall engine health. Always consult your carburetor's tuning guide and consider factors like altitude, engine modifications, and riding style when selecting the appropriate jet size for your specific setup.
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
Common questions
What is the purpose of a #187.5 main jet?
A #187.5 main jet controls fuel flow during cruise and part-throttle operation, allowing for fine-tuning of your V-twin's fuel mixture.
Are these jets compatible with my Harley-Davidson or Indian Motorcycle?
These jets will fit if your Harley-Davidson or Indian Motorcycle uses a Mikuni carburetor that accepts large round main jets. Confirm your carb model for compatibility.
Why are these jets sold in a 4-pack?
The 4-pack is convenient for extensive tuning, allows for servicing multiple carburetors, or provides spares for future adjustments.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Mikuni |
| TYPE | Jets |
| SKU | 134-71875 |
| WEIGHT | 0.05 lb |
