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Start ShoppingMIKUNI #145 Large Round Main Jet - Brass Carburetor Jet for High-Performance Engines
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Description
Upgrade your carburetor's fuel delivery system with MIKUNI's #145 Large Round Main Jet. This precision-machined brass jet ensures optimal fuel-air mixture for enhanced engine performance, responsiveness, and reliability in demanding riding conditions.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- #145 Jet Size: Precisely calibrated for accurate fuel metering in high-performance engines.
- Exact Dimensions: 7.7mm outer diameter and 3.7mm orifice for perfect fitment and flow control.
- Lightweight Design: Approximately 1g per jet reduces moving mass for faster throttle response.
Why Choose This Product
MIKUNI's Large Round Main Jet delivers unmatched precision for riders seeking maximum power and efficiency. The brass material ensures consistent flow characteristics, while the exact sizing guarantees compatibility with original equipment carburetors. Whether you're tuning for racing or street performance, this jet provides reliable fuel delivery that enhances engine responsiveness and throttle control.
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Upgrade your carburetor's fuel delivery system with MIKUNI's #145 Large Round Main Jet. This precision-machined brass jet ensures optimal fuel-air mixture for enhanced engine performance, responsiveness, and reliability in demanding riding conditions.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- #145 Jet Size: Precisely calibrated for accurate fuel metering in high-performance engines.
- Exact Dimensions: 7.7mm outer diameter and 3.7mm orifice for perfect fitment and flow control.
- Lightweight Design: Approximately 1g per jet reduces moving mass for faster throttle response.
Why Choose This Product
MIKUNI's Large Round Main Jet delivers unmatched precision for riders seeking maximum power and efficiency. The brass material ensures consistent flow characteristics, while the exact sizing guarantees compatibility with original equipment carburetors. Whether you're tuning for racing or street performance, this jet provides reliable fuel delivery that enhances engine responsiveness and throttle control.
| SKU | GM53A10422 |
|---|---|
| MPN | FN100604-145 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Models with Mikuni VM/PF/BS carburetors (e.g., Honda XR/CRF, Yamaha YZ/WR, Kawasaki KX/KLX, Suzuki RM/DRZ) | 1980-2025 |
Frequently Asked Questions
Fits Mikuni large round main jet applications including VM, BS, PF series carburetors on most Japanese dirt bikes and ATVs.
Check your current main jet marking, use plug reads or wideband O2 sensor for tuning, or consult jetting charts for your setup.
Yes, large round jets have a 7.7mm OD and different flow characteristics; not interchangeable with small round (6.5mm OD).
No, Mikuni jets are not directly compatible with Keihin carbs due to different threading and orifice design.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet cleaning wire or compressed air
Pro Tips
- Remove carburetor float bowl, note stock jet size, clean jet thoroughly, test plug chop after install to verify mixture
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing wrong jet size without testing
Comparison vs Stock/OEM
Direct OEM replacement or upgrade for stock Mikuni carbs; precision machined brass for consistent fuel flow
Improvements
- Better flow consistency than worn stock jets
- Enables precise tuning for mods like exhaust/air filter
Considerations
- Requires tuning to avoid lean/rich conditions
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning; replace if clogged or eroded
Warranty
Limited lifetime from Mikuni against manufacturing defects
Maintenance
Clean with carb cleaner and wire every service; inspect during air filter changes
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