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Start ShoppingMIKUNI F42-19 HSR 45/42 High Flow Slide Carburetor Kit for Big Twin EVO & Twin Cam
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Description
Elevate your ride's power output with MIKUNI's premium HSR 45/42 Total Carburetor Kit. This high-flow system delivers exceptional performance for Big Twin EVO and Twin Cam motorcycles, maximizing horsepower without compromising airflow efficiency.
Key Features
- Aluminum Body Construction: Durable, lightweight design for optimal airflow and heat dissipation
- 45mm/42mm Throttle Bore Compatibility: Versatile fitment for HSR42 or HSR45 carburetor options
- Stainless Steel Components: Corrosion-resistant build for long-lasting performance in all weather conditions
- Complete Kit Inclusion: Includes intake manifold, air filter adapter, cables, and precision jets for hassle-free installation
- High-Flow Filter System: Maintains 100 horsepower output with minimal restriction for maximum engine efficiency
Why Choose This Product
Upgrade to a professional-grade carburetor system engineered for power delivery and reliability. The combination of brass jets and stainless steel components ensures precise fuel metering while resisting wear from fuel and environmental factors. This kit's universal compatibility with major motorcycle models makes it an ideal choice for performance enthusiasts seeking to unlock their engine's full potential without sacrificing durability or ease of maintenance.
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Elevate your ride's power output with MIKUNI's premium HSR 45/42 Total Carburetor Kit. This high-flow system delivers exceptional performance for Big Twin EVO and Twin Cam motorcycles, maximizing horsepower without compromising airflow efficiency.
Key Features
- Aluminum Body Construction: Durable, lightweight design for optimal airflow and heat dissipation
- 45mm/42mm Throttle Bore Compatibility: Versatile fitment for HSR42 or HSR45 carburetor options
- Stainless Steel Components: Corrosion-resistant build for long-lasting performance in all weather conditions
- Complete Kit Inclusion: Includes intake manifold, air filter adapter, cables, and precision jets for hassle-free installation
- High-Flow Filter System: Maintains 100 horsepower output with minimal restriction for maximum engine efficiency
Why Choose This Product
Upgrade to a professional-grade carburetor system engineered for power delivery and reliability. The combination of brass jets and stainless steel components ensures precise fuel metering while resisting wear from fuel and environmental factors. This kit's universal compatibility with major motorcycle models makes it an ideal choice for performance enthusiasts seeking to unlock their engine's full potential without sacrificing durability or ease of maintenance.| SKU | GM37BAFDEA |
|---|---|
| MPN | F42-19 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Honda | CRF450R | 2009-2024 |
| Honda | CRF450RX | 2010-2024 |
| Honda | CRF250R | 2008-2024 |
| KTM | 450 SX-F | 2013-2024 |
| KTM | 350 SX-F | 2014-2024 |
Frequently Asked Questions
Direct bolt-on for Honda CRF450R/RX (2009+). KTM 350/450 requires manifold adapter.
Includes main jet kit with multiple sizes. Comes jetted for sea level, adjust for your altitude/temp.
Yes, fully compatible with stock or aftermarket exhaust systems.
This is a complete carb replacement. No other carbs to rejet.
1-year manufacturer defect warranty through authorized Mikuni dealers.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 30 min
Tools Required
- Socket set (8-14mm)
- Torque wrench
- Carb cleaner
- Jetting tools (small flathead screwdriver)
- Thread locker
Pro Tips
- Clean all mating surfaces thoroughly
- Use included jetting chart and adjust for your conditions
- Replace fuel petcock/filter during install
- Torque manifold bolts to spec (usually 8-10 ft-lbs)
Common Mistakes to Avoid
- Incorrect jetting for altitude/temperature
- Not syncing throttle cables
- Overlooking intake boot condition
Comparison vs Stock/OEM
Much larger bore (45/42mm vs stock ~40mm) provides superior throttle response and top-end power
Improvements
- Dramatic mid-to-top power increase
- Crisp throttle response
- Easier tuning and maintenance
- Better atomization
Considerations
- Requires proper jetting
- May need bottom-end adjustment for max power
Durability & Warranty
Expected Lifespan
5+ years with proper maintenance
Warranty
1 year manufacturer warranty
Maintenance
Clean every 10-20 hours racing, check jetting seasonally, replace float valve yearly
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