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Start ShoppingMIKUNI F4/042-260 Hex Main Jets - High-Performance Brass Carburetor Jets for Racing & Off-Road
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Description
Upgrade your engine's fuel delivery system with these precision-engineered MIKUNI Hex Main Jets. Designed for maximum performance, these brass jets provide consistent fuel flow and superior reliability for racing, off-road, and high-output engines.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding environments.
- #260 Jet Size: Precisely calibrated for optimal fuel-air mixture in high-performance engines.
- Hex Head Thread: 5mm x 0.75mm pitch design ensures secure, leak-free installation in MIKUNI carburetors.
- Compact Dimensions: 10mm diameter head and 12mm length for easy handling and precise tuning.
- Lightweight Design: Less than 1 gram reduces moving mass for improved engine responsiveness.
Why Choose This Product
These MIKUNI jets deliver unmatched precision and reliability for riders seeking peak engine performance. The brass material resists clogging and wear, while the hex thread ensures a perfect seal. Perfect for tuning high-horsepower engines, these jets offer consistent fuel delivery across varying conditions, making them ideal for racing, motocross, and off-road applications. Their lightweight construction also enhances throttle response, giving riders a competitive edge.
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Upgrade your engine's fuel delivery system with these precision-engineered MIKUNI Hex Main Jets. Designed for maximum performance, these brass jets provide consistent fuel flow and superior reliability for racing, off-road, and high-output engines.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in demanding environments.
- #260 Jet Size: Precisely calibrated for optimal fuel-air mixture in high-performance engines.
- Hex Head Thread: 5mm x 0.75mm pitch design ensures secure, leak-free installation in MIKUNI carburetors.
- Compact Dimensions: 10mm diameter head and 12mm length for easy handling and precise tuning.
- Lightweight Design: Less than 1 gram reduces moving mass for improved engine responsiveness.
Why Choose This Product
These MIKUNI jets deliver unmatched precision and reliability for riders seeking peak engine performance. The brass material resists clogging and wear, while the hex thread ensures a perfect seal. Perfect for tuning high-horsepower engines, these jets offer consistent fuel delivery across varying conditions, making them ideal for racing, motocross, and off-road applications. Their lightweight construction also enhances throttle response, giving riders a competitive edge.| SKU | GM8BC2724A |
|---|---|
| MPN | F4/042-260 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various | Carbureted motorcycles/ATVs with Mikuni VM or TM series carbs | 1980-2025 |
| Suzuki | RM250, RMZ250, DRZ400 | 1990-2010 |
| Yamaha | YFS200 Blaster, YZ250 | 1985-2005 |
Frequently Asked Questions
Fits Mikuni VM series (VM26/428, VM30/89), TM40/42 flat slides, and some PWK conversions. Check your carb markings.
Depends on engine mods, altitude, temp. Start with plug chop method or wideband O2 sensor for tuning.
Hex head (F4 series) allows tool removal without slipping; same orifice size as round (VM) jets.
Thread matches many Keihin PWK/VM clones, but verify pitch (M5x0.75). Not direct OEM Keihin replacement.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench or hex key (optional)
Pro Tips
- Remove carb float bowl first. Use carb cleaner to inspect passages. Always change air filter when rejetting.
Common Mistakes to Avoid
- Dropping tiny jet into carb body
- Not cleaning needle jet before install
Comparison vs Stock/OEM
Direct replacement for OEM Mikuni jets; hex head improves serviceability over smooth/knurled OEM designs
Improvements
- Easier installation/removal with wrench
- Precision machined for consistent flow
- Corrosion-resistant brass
Considerations
- No performance difference from OEM if sized correctly; tuning required for gains
Durability & Warranty
Expected Lifespan
Indefinite with proper tuning (no fuel wash from lean condition)
Warranty
Limited lifetime from Mikuni against defects
Maintenance
Inspect during carb cleans; replace if orifice erodes from poor jetting
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