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Start ShoppingMIKUNI FVM38/41-R-8 Needle Jet - High-Performance Carburetor Fuel System for Powersports Vehicles
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Description
Upgrade your powersports engine's fuel delivery system with the MIKUNI FVM38/41-R-8 Needle Jet. This high-performance component ensures precise fuel metering for improved throttle response, smoother power delivery, and consistent engine performance across a range of riding conditions.
Key Features
- Exact Fuel Metering: Advanced needle jet design delivers consistent fuel flow for optimal combustion efficiency.
- Universal Compatibility: Fits most MIKUNI FVM38/FVM41 carburetor models for easy installation.
- Durable Construction: Precision-machined brass components withstand high temperatures and corrosive environments.
- Performance Optimization: Fine-tuned needle jet geometry enhances low-end torque and mid-range power.
Why Choose This Product
Whether you're modifying a motorcycle, ATV, or UTV, this needle jet offers reliable fuel delivery that maximizes engine efficiency. Its robust construction ensures long-term durability, while the precise fuel metering improves throttle response and fuel economy. The universal fit makes it an ideal upgrade for riders seeking to enhance their powersports vehicle's performance without compromising reliability.
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Upgrade your powersports engine's fuel delivery system with the MIKUNI FVM38/41-R-8 Needle Jet. This high-performance component ensures precise fuel metering for improved throttle response, smoother power delivery, and consistent engine performance across a range of riding conditions.
Key Features
- Exact Fuel Metering: Advanced needle jet design delivers consistent fuel flow for optimal combustion efficiency.
- Universal Compatibility: Fits most MIKUNI FVM38/FVM41 carburetor models for easy installation.
- Durable Construction: Precision-machined brass components withstand high temperatures and corrosive environments.
- Performance Optimization: Fine-tuned needle jet geometry enhances low-end torque and mid-range power.
Why Choose This Product
Whether you're modifying a motorcycle, ATV, or UTV, this needle jet offers reliable fuel delivery that maximizes engine efficiency. Its robust construction ensures long-term durability, while the precise fuel metering improves throttle response and fuel economy. The universal fit makes it an ideal upgrade for riders seeking to enhance their powersports vehicle's performance without compromising reliability.| SKU | GM990C0D40 |
|---|---|
| MPN | FVM38/41-R-8 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various (Suzuki, Yamaha, Honda, Kawasaki) | VM38/VM40/VM41 carbureted models (e.g., Suzuki RM250/380, Yamaha YZ250/490, Honda CR250/480) | 1980-2024 |
Frequently Asked Questions
Fits Mikuni VM38, VM40, VM41 flat-slide carburetors with compatible bore sizes. Check your carb markings.
This is the primary needle jet that works with the slide needle.
Recommended to pair with matching main jets, pilot jets, and needles for proper tuning.
R-8 size provides richer mid-range fueling; ideal for modified engines or altitude changes.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- Small flathead screwdriver
- Carburetor rebuild kit tools
- Jetting gauge (optional)
Pro Tips
- Remove emulsion tube first to access needle jet. Clean thoroughly with carb cleaner. Always rejet needles and main jet when changing needle jet.
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Incorrect orientation of jet
Comparison vs Stock/OEM
Direct OEM replacement or performance upgrade for worn stock needle jets
Improvements
- Precise fuel metering for better throttle response
- R-8 size richer than stock R-6/7 for modified engines
Considerations
- Must re-jet entire carb for optimal performance
Durability & Warranty
Expected Lifespan
Indefinite with proper maintenance (lasts engine life unless crashed)
Warranty
Limited lifetime from Mikuni against manufacturing defects
Maintenance
Inspect during carb cleanings; replace if scored or corroded
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