Your cart is empty
Start ShoppingMIKUNI F4/042-330 Hex Main Jets - Precision Brass Carburetor Jet for High-Performance Engines
Fits your
May not fit your
Description
Upgrade your carburetor's fuel delivery system with MIKUNI's F4/042-330 Hex Main Jets. These precision-engineered brass jets deliver consistent airflow and fuel mixture for optimized engine performance in demanding riding conditions.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh environments.
- #330 Jet Size: Precisely calibrated for balanced fuel-air ratios in high-output engines.
- Hex Head Thread: 5/16-32 thread pattern ensures secure, leak-free installation.
- Compact Design: 0.5" length and 0.3" diameter fit standard carburetor housings.
- Lightweight: 0.1 oz weight minimizes impact on engine balance and responsiveness.
Why Choose This Product
Whether you're tuning a racing motorcycle or optimizing an ATV's performance, these jets offer unmatched accuracy and reliability. The brass material resists clogging and maintains consistent flow rates, while the hex thread ensures easy installation and adjustment. Perfect for riders seeking precise control over fuel delivery without compromising durability.
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
$21.85
In Cart
Upgrade your carburetor's fuel delivery system with MIKUNI's F4/042-330 Hex Main Jets. These precision-engineered brass jets deliver consistent airflow and fuel mixture for optimized engine performance in demanding riding conditions.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh environments.
- #330 Jet Size: Precisely calibrated for balanced fuel-air ratios in high-output engines.
- Hex Head Thread: 5/16-32 thread pattern ensures secure, leak-free installation.
- Compact Design: 0.5" length and 0.3" diameter fit standard carburetor housings.
- Lightweight: 0.1 oz weight minimizes impact on engine balance and responsiveness.
Why Choose This Product
Whether you're tuning a racing motorcycle or optimizing an ATV's performance, these jets offer unmatched accuracy and reliability. The brass material resists clogging and maintains consistent flow rates, while the hex thread ensures easy installation and adjustment. Perfect for riders seeking precise control over fuel delivery without compromising durability.| SKU | GM379EF376 |
|---|---|
| MPN | F4/042-330 |
| 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 (Keihin/Mikuni carbs) | 1980-2025 |
| Honda | XR series, CRF250/450 (pre-fuel injection) | 1985-2005 |
| Yamaha | PW/YZ/WR series | 1990-2010 |
| Suzuki | RM/DR-Z series | 1980-2015 |
| Kawasaki | KX/KLX series | 1995-2020 |
Frequently Asked Questions
Fits Mikuni VM26-VM34, PF, BS series carbs on many 125-500cc bikes/ATVs. Measure your stock jet to confirm.
Yes, hex head style for easier installation/removal without special tools.
Often yes - pair with pilot jet, needle, and air screw adjustments for complete tuning.
No, Mikuni jets have different threading; check your carb markings.
Each size (#330 vs #320) increases fuel flow ~2-3%; test plug reads help fine-tune.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench or hex key (optional)
Pro Tips
- Remove float bowl completely for access. Clean jet orifice with carb cleaner and compressed air. Verify clip position on needle
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing wrong size jet
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for worn jets; identical to factory Mikuni jets
Improvements
- Precise fuel metering for optimal A/F ratio
- Corrosion-resistant brass
- Easier hex installation
Considerations
- Must match engine mods/elevation; not plug-and-play without tuning
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning; replace when clogged or worn
Warranty
Limited lifetime (manufacturer defect only)
Maintenance
Clean every service (20-50 hours); ultrasonic clean annually for racers
What Others Are Saying
Reviews from across the web
