Mikuni Large Round Main Jets #87.5 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 control for your carbureted V-twin with this 4-pack of Mikuni Large Round Main Jets in #87.5 size. These genuine Mikuni components are essential for optimizing fuel delivery at cruise and part-throttle RPMs on Harley-Davidson and Indian Motorcycle applications.
Why riders pick this
- Genuine Mikuni OEM construction for reliability
- Precision #87.5 main jet for accurate fuel metering
- Large round design ensures correct carburetor fitment
- Convenient 4-pack for extensive tuning possibilities
- Essential for fine-tuning fuel delivery on V-twin carbs
When you're fine-tuning your V-twin for peak performance, every detail counts. These Mikuni Large Round Main Jets, sized #87.5, are engineered to deliver precise fuel metering, critical for maintaining the correct air-fuel ratio after installing performance air cleaners, exhaust systems, or adjusting for different riding elevations on your Harley-Davidson or Indian Motorcycle.
Optimized Fuel Control
- Genuine Mikuni OEM quality ensures consistent and reliable performance
- #87.5 main jet size for precise fuel flow adjustments
- Large round body design guarantees proper fitment in compatible Mikuni carburetors
- Supplied in a convenient 4-pack for comprehensive tuning options
The Key to a Balanced Tune
Choosing the right main jet is fundamental to a well-tuned V-twin. A precisely jetted carburetor ensures smooth throttle response, prevents bogging, and maximizes your engine's power output across the rev range. This four-pack provides the necessary flexibility to find that sweet spot, allowing you to incrementally adjust and confirm your fuel mixture for a truly optimized ride.
Specifications
- Brand: Mikuni
- Manufacturer Part #: FN100604-87.5
- 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 difference between main jets and pilot jets?
Main jets control fuel delivery at mid to high throttle openings and cruising speeds, while pilot jets manage fuel flow at idle and very low RPMs. Both are critical for a complete carburetor tune.
How do I know if the #87.5 jet is suitable for my V-twin?
The correct jet size depends on your specific motorcycle, any modifications, and your riding environment. Always refer to your carburetor's documentation or consult a professional tuner to confirm the appropriate jet for your setup.
Why are these jets sold in a 4-pack?
Jets are often sold in multi-packs to provide options for tuning. It allows you to test different sizes to find the optimal fuel mixture for your V-twin without having to order individual jets repeatedly.
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 | 134-70875 |
| WEIGHT | 0.05 lb |
