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Start ShoppingMIKUNI F990-605-065 Idle Screw Adjuster - Precision Carburetor Idle Speed Control for Powersports Engines
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Description
Achieve perfect idle control and engine performance with MIKUNI's precision-engineered idle screw adjuster. This critical component ensures smooth operation, responsive throttle response, and reliable fuel efficiency for powersports engines.
Key Features
- Exact Fitment: Designed specifically for MIKUNI carburetor systems to ensure seamless integration and optimal performance.
- Adjustable Idle Speed: Fine-tune engine idle settings for improved fuel efficiency and rider comfort.
- Durable Construction: Made from high-quality materials to withstand harsh riding conditions and prolonged use.
- Easy Installation: Simple design allows for quick replacement without requiring specialized tools.
Why Choose This Product
Upgrade your powersports engine's performance with this essential carburetor component. The MIKUNI idle screw adjuster delivers precise control over idle speed, reducing engine strain and enhancing overall ride quality. Its durable build ensures long-lasting reliability, while the straightforward installation process saves time and labor costs. Whether you're tuning a motorcycle, ATV, or UTV, this adjuster provides the accuracy needed for peak engine performance.
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Achieve perfect idle control and engine performance with MIKUNI's precision-engineered idle screw adjuster. This critical component ensures smooth operation, responsive throttle response, and reliable fuel efficiency for powersports engines.
Key Features
- Exact Fitment: Designed specifically for MIKUNI carburetor systems to ensure seamless integration and optimal performance.
- Adjustable Idle Speed: Fine-tune engine idle settings for improved fuel efficiency and rider comfort.
- Durable Construction: Made from high-quality materials to withstand harsh riding conditions and prolonged use.
- Easy Installation: Simple design allows for quick replacement without requiring specialized tools.
Why Choose This Product
Upgrade your powersports engine's performance with this essential carburetor component. The MIKUNI idle screw adjuster delivers precise control over idle speed, reducing engine strain and enhancing overall ride quality. Its durable build ensures long-lasting reliability, while the straightforward installation process saves time and labor costs. Whether you're tuning a motorcycle, ATV, or UTV, this adjuster provides the accuracy needed for peak engine performance.
| SKU | GMC51C9F17 |
|---|---|
| MPN | F990-605-065 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Suzuki | DR400/DR-Z400 | 1985-2005 |
| Kawasaki | KLX250/300 | 1990-2010 |
| Multiple Japanese | Various carbureted bikes (check OEM cross-reference) | 1980-2020 |
Frequently Asked Questions
Yes, it is a direct replacement for the idle adjuster on Mikuni carbs used in DR-Z400 models from that era.
Mikuni is the OEM carb manufacturer for many Japanese bikes, so this is genuine Mikuni, equivalent to OEM.
No, it can usually be swapped with the carb in place, but access may vary by bike.
This is a knurled adjuster for easier tuning without tools.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Phillips screwdriver
- small flathead screwdriver
Pro Tips
- Clean carb threads before install
- Use thread locker sparingly on tip
Common Mistakes to Avoid
- Over-tightening which strips threads
- Not seating properly in carb body
Comparison vs Stock/OEM
Genuine Mikuni replacement, often with improved knurling for finger adjustment vs. basic slotted OEM screw
Improvements
- Easier tuning without tools
- More durable brass construction
- Precise idle adjustment
Considerations
- None significant; direct OEM equivalent
Durability & Warranty
Expected Lifespan
Indefinite with proper use (metal construction)
Warranty
Limited lifetime from Mikuni (defect only)
Maintenance
Inspect for thread wear during carb service
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