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Start ShoppingMIKUNI F42-7 HSR 45/42 Carburetor Easy Kit - Stock Look Performance Upgrade
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Description
Elevate your engine's performance without compromising your bike's original look. The MIKUNI F42-7 HSR 45/42 Carburetor Easy Kit delivers precise fuel delivery and enhanced throttle response, perfect for riders seeking power gains with minimal modifications.
Key Features
- Aluminum Body & Brass Components: Durable construction ensures long-lasting performance with corrosion resistance.
- Flat Slide Design: Provides smoother acceleration and better control over wide-open throttle.
- Power Jet System: Optimizes fuel flow for maximum power output across all RPM ranges.
- Stock Manifold Compatibility: Retains original factory components for easy installation and maintenance.
- California Legal Options: Special A.R.B. kits available for EVO Big Twin applications.
Why Choose This Product
Whether you're tuning for street performance or track readiness, this carburetor kit offers a balance of power, reliability, and ease of installation. The included jetting (142-158 main, 25-35 pilot) and accelerator pump system ensure optimal fuel metering for various riding conditions. Its compatibility with stock airboxes or Screamin' Eagle filters gives you flexibility without sacrificing factory aesthetics. Always verify local emissions regulations before installation to ensure compliance with pollution control standards.
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Elevate your engine's performance without compromising your bike's original look. The MIKUNI F42-7 HSR 45/42 Carburetor Easy Kit delivers precise fuel delivery and enhanced throttle response, perfect for riders seeking power gains with minimal modifications.
Key Features
- Aluminum Body & Brass Components: Durable construction ensures long-lasting performance with corrosion resistance.
- Flat Slide Design: Provides smoother acceleration and better control over wide-open throttle.
- Power Jet System: Optimizes fuel flow for maximum power output across all RPM ranges.
- Stock Manifold Compatibility: Retains original factory components for easy installation and maintenance.
- California Legal Options: Special A.R.B. kits available for EVO Big Twin applications.
Why Choose This Product
Whether you're tuning for street performance or track readiness, this carburetor kit offers a balance of power, reliability, and ease of installation. The included jetting (142-158 main, 25-35 pilot) and accelerator pump system ensure optimal fuel metering for various riding conditions. Its compatibility with stock airboxes or Screamin' Eagle filters gives you flexibility without sacrificing factory aesthetics. Always verify local emissions regulations before installation to ensure compliance with pollution control standards.| SKU | GMED07855F |
|---|---|
| MPN | F42-7 |
| 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 |
| KTM | 450 EXC-F | 2008-2024 |
| Yamaha | YZ450F | 2010-2024 |
Frequently Asked Questions
Yes, the Easy Kit includes carburetor, jets, air filter adapter, intake manifold, throttle cable, and full tuning kit.
Requires removing stock carb and may need manifold adapter. Check fitment for your model.
Kit includes jet range. Go 2-4 sizes smaller on main jet per 3000ft above sea level. Consult Mikuni chart.
Designed for off-road/racing. May not pass emissions for street-legal bikes.
HSR45/42 has dual bore (45mm main, 42mm slide) for better low-end response vs standard 42mm.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 30 min
Tools Required
- screwdriver set
- carb cleaner
- torque wrench
- 12mm socket
- needle nose pliers
- manifold adapter tool
Pro Tips
- Clean all mating surfaces thoroughly
- Bench sync the carbs if dual setup
- Use provided jetting chart and verify with plug reads
- Apply light oil to slide
Common Mistakes to Avoid
- Incorrect jetting for altitude/temperature
- Not syncing throttle cables
- Overlooking intake boot condition
Comparison vs Stock/OEM
Much larger throttle bore than OEM (typically 38-40mm) with flat slide vs CV design
Improvements
- Superior throttle response
- 20-30% more power across RPM range
- Better jetting adjustability
- Eliminate stock carb bogging
Considerations
- Requires tuning expertise
- Less emissions compliant
- Cold starts may need choke adjustment
Durability & Warranty
Expected Lifespan
5+ years with proper maintenance
Warranty
1 year manufacturer defect warranty
Maintenance
Clean every 10-20 hours racing, check float height seasonally, rebuild every 100 hours hard use
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