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Start ShoppingMIKUNI FVM22/171 Idle Adjusting Screw - Brass Carburetor Idle Screw for Powersports Engines
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Description
Precision-tuned for MIKUNI carburetor systems, this idle adjusting screw ensures smooth engine operation and responsive throttle control. Essential for maintaining proper idle speed in powersports engines.
Key Features
- Brass Construction with Steel Spring: Combines corrosion resistance with spring-loaded durability for long-lasting performance in harsh environments.
- M5 x 0.8 Thread Size: Standard thread pitch ensures compatibility with original equipment and easy installation.
- 25mm Length: Optimal length for precise idle adjustment without overextension or damage.
- Lightweight Design (14g): Reduces rotational inertia for smoother engine response and fuel efficiency.
Why Choose This Product
Engineers for MIKUNI carburetor systems, this screw delivers unmatched reliability for powersports applications. The brass alloy resists wear from fuel and moisture, while the steel spring ensures consistent pressure for accurate idle control. Its compact design fits tight engine compartments, making it ideal for motorcycle, ATV, and UTV maintenance. Whether tuning for performance or troubleshooting idle issues, this screw provides the precision needed to keep engines running smoothly.
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Precision-tuned for MIKUNI carburetor systems, this idle adjusting screw ensures smooth engine operation and responsive throttle control. Essential for maintaining proper idle speed in powersports engines.
Key Features
- Brass Construction with Steel Spring: Combines corrosion resistance with spring-loaded durability for long-lasting performance in harsh environments.
- M5 x 0.8 Thread Size: Standard thread pitch ensures compatibility with original equipment and easy installation.
- 25mm Length: Optimal length for precise idle adjustment without overextension or damage.
- Lightweight Design (14g): Reduces rotational inertia for smoother engine response and fuel efficiency.
Why Choose This Product
Engineers for MIKUNI carburetor systems, this screw delivers unmatched reliability for powersports applications. The brass alloy resists wear from fuel and moisture, while the steel spring ensures consistent pressure for accurate idle control. Its compact design fits tight engine compartments, making it ideal for motorcycle, ATV, and UTV maintenance. Whether tuning for performance or troubleshooting idle issues, this screw provides the precision needed to keep engines running smoothly.
| SKU | GMDE79CB90 |
|---|---|
| MPN | FVM22/171 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Models with Mikuni VM22, VM24, VM26, VM28, VM30, VM32, VM34, VM36, VM38 carburetors | 1980-2024 |
Frequently Asked Questions
Fits Mikuni VM series carbs including VM22/171 jets, VM24, VM26, VM28, VM30, VM32, VM34, VM36, VM38. Check your carb markings.
Yes, Mikuni is the OEM supplier for most Japanese bikes. This is genuine Mikuni.
No, this is just the idle adjust screw. Rejetting only needed if changing main jet or air/fuel mods.
Worn tip won't hold adjustment, idle hunts, or screw won't turn smoothly.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Flathead screwdriver
- Tachometer (optional for tuning)
Pro Tips
- Turn screw in gently until seated, then back out 1.5-2 turns as starting point. Clean carb passages first for accurate idle set
Common Mistakes to Avoid
- Over-tightening which strips threads
- Not cleaning idle circuit before install
Comparison vs Stock/OEM
Identical to OEM as Mikuni manufactures stock carbs for most brands
Improvements
- New precise threading
- Proper spring tension for stable idle
Considerations
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Durability & Warranty
Expected Lifespan
Indefinite with proper use (lasts life of carb)
Warranty
Mikuni lifetime against defects
Maintenance
Inspect for wear during carb cleanings (yearly)
What Others Are Saying
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