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Start ShoppingMIKUNI F45-2 HSR 45/42 High Flow Carburetor Kit for Big Twin EVO & Twin Cam
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Description
Elevate your engine's performance with MIKUNI's premium HSR 45/42 Total Carburetor Kit. This high-flow system delivers exceptional power output while maintaining optimal air-fuel balance for Big Twin EVO and Twin Cam models.
Key Features
- Aluminum Body Construction: Durable, lightweight design for improved engine efficiency and heat dissipation
- Stainless Steel Components: Corrosion-resistant build for long-lasting performance in harsh environments
- Slide Carburetor System: Precise fuel delivery with 45mm main and 42mm secondary throttle bore for optimal airflow
- Complete Kit Inclusion: Includes intake manifold, air filter adapter, cables, and precision brass jets for hassle-free installation
- High-Flow Filter Design: Maintains 100+ horsepower output without restriction, ensuring peak engine performance
Why Choose This Product
Upgrade your powersports engine with a carburetor kit engineered for maximum airflow and power delivery. The MIKUNI F45-2's advanced slide system provides responsive throttle control while the durable aluminum body withstands extreme operating conditions. With compatible fitment for both 45mm and 42mm carburetors, this kit offers versatile performance tuning options. The inclusion of stainless steel components and precision brass jets ensures reliable operation and easy maintenance, making it an essential upgrade for performance-oriented riders.
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Elevate your engine's performance with MIKUNI's premium HSR 45/42 Total Carburetor Kit. This high-flow system delivers exceptional power output while maintaining optimal air-fuel balance for Big Twin EVO and Twin Cam models.
Key Features
- Aluminum Body Construction: Durable, lightweight design for improved engine efficiency and heat dissipation
- Stainless Steel Components: Corrosion-resistant build for long-lasting performance in harsh environments
- Slide Carburetor System: Precise fuel delivery with 45mm main and 42mm secondary throttle bore for optimal airflow
- Complete Kit Inclusion: Includes intake manifold, air filter adapter, cables, and precision brass jets for hassle-free installation
- High-Flow Filter Design: Maintains 100+ horsepower output without restriction, ensuring peak engine performance
Why Choose This Product
Upgrade your powersports engine with a carburetor kit engineered for maximum airflow and power delivery. The MIKUNI F45-2's advanced slide system provides responsive throttle control while the durable aluminum body withstands extreme operating conditions. With compatible fitment for both 45mm and 42mm carburetors, this kit offers versatile performance tuning options. The inclusion of stainless steel components and precision brass jets ensures reliable operation and easy maintenance, making it an essential upgrade for performance-oriented riders.
| SKU | GM284F0833 |
|---|---|
| MPN | F45-2 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Honda | CRF450R | 2003-2024 |
| Honda | CRF450X | 2004-2024 |
| Honda | CRF450RL | 2009-2024 |
| KTM | 450 SX-F | 2019-2024 |
| KTM | 500 EXC-F | 2019-2024 |
Frequently Asked Questions
Primarily Honda CRF450R/X/RL (2003+), some KTM 450/500 models. Check fitment tab for your year/make/model.
Yes, includes main kit jetting for sea level. Re-jet for altitude above 3000ft.
Initial jetting is good, but fine-tune idle and pilot screw for your setup.
Aftermarket performance part - may affect manufacturer warranty. Check with dealer.
Complete HSR45/42 carbs, intake manifold, throttle cables, K&N-style filter adapter, full jet kit, instructions.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- socket set
- torque wrench
- screwdrivers
- needle nose pliers
- carb cleaner
Pro Tips
- Bench sync the carbs before install
- Use included jetting chart and adjust for elevation/temp
- Apply thread locker to throttle cable adjusters
Common Mistakes to Avoid
- Incorrect jetting causing lean/rich conditions
- Not syncing throttle valves
- Damaging float bowl gasket during install
Comparison vs Stock/OEM
Much larger bore (45/42mm vs stock ~40mm) for superior airflow and throttle response
Improvements
- 20-30% more power
- Crisp throttle response
- Easier tuning
- Better top-end power
Considerations
- Requires rejetting
- More aggressive power delivery
Durability & Warranty
Expected Lifespan
5+ years with proper maintenance
Warranty
Limited lifetime on carb body, 1 year on components (Mikuni)
Maintenance
Clean every 20-50 hours, check float height seasonally, rebuild kit every 100 hours racing
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