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Start ShoppingMIKUNI FVM38/09 Guide Screw - Carburetor Needle Jet Extender for Fuel Systems
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Description
Precision fuel system tuning just got easier with MIKUNI's FVM38/09 Guide Screw. This critical component extends needle jet length, enabling larger needle operation without main jet interference while replicating main jet ring functionality for optimal air-fuel balance.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh engine environments
- M4 x 0.7 Thread: Standard thread size for easy installation in compatible carburetors
- 10mm Length: Precisely engineered dimension for proper needle jet extension
- 0.5 oz Weight: Lightweight design minimizes impact on engine balance and fuel efficiency
Why Choose This Product
Upgrade your carburetor's fuel delivery capabilities with this essential MIKUNI component. The guide screw provides critical clearance for larger needles, improving throttle response and mid-range power. Its dual-function design eliminates the need for a separate main jet ring, simplifying maintenance while maintaining precise fuel metering. The brass construction resists wear and corrosion, ensuring reliable performance through thousands of miles of riding. Perfect for riders seeking fine-tuned fuel system optimization without compromising engine efficiency.
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Precision fuel system tuning just got easier with MIKUNI's FVM38/09 Guide Screw. This critical component extends needle jet length, enabling larger needle operation without main jet interference while replicating main jet ring functionality for optimal air-fuel balance.
Key Features
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh engine environments
- M4 x 0.7 Thread: Standard thread size for easy installation in compatible carburetors
- 10mm Length: Precisely engineered dimension for proper needle jet extension
- 0.5 oz Weight: Lightweight design minimizes impact on engine balance and fuel efficiency
Why Choose This Product
Upgrade your carburetor's fuel delivery capabilities with this essential MIKUNI component. The guide screw provides critical clearance for larger needles, improving throttle response and mid-range power. Its dual-function design eliminates the need for a separate main jet ring, simplifying maintenance while maintaining precise fuel metering. The brass construction resists wear and corrosion, ensuring reliable performance through thousands of miles of riding. Perfect for riders seeking fine-tuned fuel system optimization without compromising engine efficiency.| SKU | GM81ED90ED |
|---|---|
| MPN | FVM38/09 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | VM/FVM series carburetors (e.g., Yamaha YZ/WR, Honda XR/CRF, Suzuki RM/DRZ) | 1980-2024 |
Frequently Asked Questions
Fits Mikuni FVM38/09 flat slide carburetors used on many off-road bikes like Yamaha YZ/WR, Honda CRF/XR series.
No, this is the guide screw (pilot screw holder) that secures the mixture screw assembly.
Genuine Mikuni OEM part.
No, specific to FVM38/09; VM series uses different threading/sizing.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- 6mm socket or wrench
Pro Tips
- Apply light thread locker if in high-vibration area; clean mating surfaces first
Common Mistakes to Avoid
- Cross-threading the screw
- Over-tightening which strips threads
Comparison vs Stock/OEM
This is the genuine OEM Mikuni part, identical to factory original
Improvements
- N/A - OEM replacement
Considerations
- Use only genuine Mikuni to ensure proper fit and fuel metering
Durability & Warranty
Expected Lifespan
Lifetime with proper torque; rarely fails
Warranty
Mikuni lifetime warranty against defects
Maintenance
Inspect during carb cleaning; replace if threads damaged
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