Your cart is empty
Start ShoppingMIKUNI FN100604-90 Large Round Main Jets - Precision Fuel Delivery for Carburetor Performance
Fits your
May not fit your
Description
Upgrade your carburetor's fuel delivery system with MIKUNI's Large Round Main Jets (FN100604-90). These precision-machined components ensure accurate fuel-air mixture ratios, delivering consistent power output and improved engine responsiveness for a wide range of powersports applications.
Key Features
- Exact Fuel Flow Control: Precisely calibrated orifice sizes optimize combustion efficiency for peak performance.
- Durable Brass Construction: Corrosion-resistant material ensures long-lasting reliability in harsh operating conditions.
- Universal Compatibility: Designed to fit standard MIKUNI carburetor setups for easy installation.
- Smooth Fuel Flow: Streamlined design reduces turbulence for consistent fuel delivery across RPM ranges.
- Performance Optimization: Enhances throttle response and low-end torque for better rider control.
Why Choose This Product
These main jets are engineered to maintain optimal fuel metering under varying altitude and temperature conditions. The high-quality brass construction resists clogging and wear, while the precise orifice sizing ensures efficient combustion for improved horsepower and fuel economy. Ideal for riders seeking to fine-tune their carburetor's performance without compromising reliability.
Delivery
Checking availability...
Estimated arrival
Order within to ship today
Orders ship
Shipping to
Enter your ZIP code for delivery estimate
Price Match Guarantee
Found it cheaper?
Log in to submit a price match request.
Price
Quantity
Free Shipping $100+
14-Day Returns
Secure Checkout
Price Match
Complete the Build
This item
$19.80
In Cart
Upgrade your carburetor's fuel delivery system with MIKUNI's Large Round Main Jets (FN100604-90). These precision-machined components ensure accurate fuel-air mixture ratios, delivering consistent power output and improved engine responsiveness for a wide range of powersports applications.
Key Features
- Exact Fuel Flow Control: Precisely calibrated orifice sizes optimize combustion efficiency for peak performance.
- Durable Brass Construction: Corrosion-resistant material ensures long-lasting reliability in harsh operating conditions.
- Universal Compatibility: Designed to fit standard MIKUNI carburetor setups for easy installation.
- Smooth Fuel Flow: Streamlined design reduces turbulence for consistent fuel delivery across RPM ranges.
- Performance Optimization: Enhances throttle response and low-end torque for better rider control.
Why Choose This Product
These main jets are engineered to maintain optimal fuel metering under varying altitude and temperature conditions. The high-quality brass construction resists clogging and wear, while the precise orifice sizing ensures efficient combustion for improved horsepower and fuel economy. Ideal for riders seeking to fine-tune their carburetor's performance without compromising reliability.
| SKU | GM6AC97361 |
|---|---|
| MPN | FN100604-90 |
| Brand | MIKUNI |
| Category | Jets |
0.0
0 reviews
0
Log in to write a review.
Reviews
No reviews yet. Be the first to review this product!
Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs (e.g., Honda XR series, Yamaha YZ, Suzuki RM) | 1980-2025 |
| Kawasaki | KX, KLX series | 1990-2010 |
Frequently Asked Questions
You must identify your carburetor model first (VM22, TM33, etc.). The FN100604-90 designation indicates a specific Mikuni jet size. Cross-reference your carburetor model with Mikuni's jet sizing charts or consult your vehicle's service manual.
Mikuni jet numbers indicate the orifice size, which controls fuel flow. Larger numbers = more fuel. The specific sizing for FN100604-90 should be verified against Mikuni's technical documentation.
Yes, but it's recommended to inspect and clean the carburetor while you have it apart. Consider replacing gaskets and O-rings at the same time to prevent future leaks.
Basic hand tools are sufficient. You'll need to remove your carburetor (tool requirements vary by vehicle), then access the main jet with a small screwdriver.
Incorrect jet sizing causes poor fuel metering, leading to lean or rich running conditions, poor performance, fouled plugs, or engine damage.
Installation Guide
Difficulty
Medium
Est. Time
15 min
Tools Required
- Small screwdriver set
- Carburetor removal tools (varies by application)
- Clean workspace
- Gasket scraper or plastic tool
Pro Tips
- Take photos during disassembly for reference
- Replace carburetor gaskets while jets are out
- Clean carburetor passages thoroughly before reassembly
- Verify jet size matches your specific carburetor model
- Keep small parts organized in a container
Common Mistakes to Avoid
- Not properly cleaning carburetor before jet replacement
- Losing small O-rings or gaskets during disassembly
- Over-tightening jet (can damage brass)
- Not matching correct jet size to carburetor model
Durability & Warranty
Expected Lifespan
Indefinite if properly maintained; brass jets don't wear out but can become clogged
Warranty
Typically covered under OEM warranty if defective
Maintenance
No maintenance required; replace only if damaged or clogged
What Others Are Saying
Reviews from across the web
