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Start ShoppingMIKUNI F42-18 HSR 45/42 Slide Carburetor - Easy Kit for Stock Look & Performance
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Description
Elevate your powersports experience with the MIKUNI F42-18 HSR 45/42 Carburetor Easy Kit. This premium slide carburetor delivers precise fuel-air mixture control while preserving your bike's original factory look. Perfect for riders seeking performance gains without compromising aesthetics.
Key Features
- Aluminum Body with Brass Jets: Durable construction ensures long-lasting performance and precise fuel delivery.
- 45mm/42mm Throttle Bore: Adjustable airflow for optimized power across engine RPM ranges.
- Adapter Compatibility: Works with stock airbox or Screamin' Eagle performance filter kits for enhanced airflow.
- California A.R.B. Legal: Special kit approved for EVO Big Twin applications (check local laws for other models).
- Stainless Steel Hardware: Corrosion-resistant components for reliable operation in all weather conditions.
Why Choose This Product
Upgrade to a high-performance carburetor that maintains your bike's original appearance while delivering improved throttle response and fuel efficiency. The easy-install design saves time and labor costs, and the dual-bore configuration allows customization for different riding conditions. Whether you're modifying a classic bike or enhancing a modern model, this kit offers a balance of performance, legality, and ease of installation.
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Elevate your powersports experience with the MIKUNI F42-18 HSR 45/42 Carburetor Easy Kit. This premium slide carburetor delivers precise fuel-air mixture control while preserving your bike's original factory look. Perfect for riders seeking performance gains without compromising aesthetics.
Key Features
- Aluminum Body with Brass Jets: Durable construction ensures long-lasting performance and precise fuel delivery.
- 45mm/42mm Throttle Bore: Adjustable airflow for optimized power across engine RPM ranges.
- Adapter Compatibility: Works with stock airbox or Screamin' Eagle performance filter kits for enhanced airflow.
- California A.R.B. Legal: Special kit approved for EVO Big Twin applications (check local laws for other models).
- Stainless Steel Hardware: Corrosion-resistant components for reliable operation in all weather conditions.
Why Choose This Product
Upgrade to a high-performance carburetor that maintains your bike's original appearance while delivering improved throttle response and fuel efficiency. The easy-install design saves time and labor costs, and the dual-bore configuration allows customization for different riding conditions. Whether you're modifying a classic bike or enhancing a modern model, this kit offers a balance of performance, legality, and ease of installation.| SKU | GM9B0780E7 |
|---|---|
| MPN | F42-18 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Honda | CRF450R | 2009-2024 |
| Honda | CRF450RX | 2010-2024 |
| KTM | 450 SX-F | 2008-2024 |
| Yamaha | YZ450F | 2010-2024 |
Frequently Asked Questions
Yes, the Easy Kit includes main jets, pilot jets, needles, and air screws pre-configured for common setups.
Initial jetting is provided, but fine-tuning based on elevation, temperature, and mods is recommended.
Yes for most compatible models, but aftermarket air filters/UHDPE lids often yield best results.
Mikuni offers a 1-year warranty against defects; register on their site.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 30 min
Tools Required
- socket set
- torque wrench
- screwdrivers
- carb cleaner
- jetting tools
Pro Tips
- Clean all mating surfaces thoroughly
- Use included jetting as starting point and dyno tune
- Replace fuel petcock with high-flow unit
Common Mistakes to Avoid
- Incorrect jetting leading to lean/rich conditions
- Not syncing throttle slides
- Overlooking intake boot replacement
Comparison vs Stock/OEM
Much larger bore (45/42mm vs stock ~42mm) with accelerator pump absent in most OEM carbs
Improvements
- Sharper throttle response
- 20-30% more top-end power
- Better atomization for mods
Considerations
- Requires tuning expertise
- Not emissions legal
Durability & Warranty
Expected Lifespan
5+ years with proper maintenance
Warranty
1 year Mikuni warranty
Maintenance
Clean/re-jet every 20-50 hours; inspect slides/float annually
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