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Start ShoppingMikuni FN100604-67.5 Large Round Main Jet - Precision Fuel Metering for High-Performance Engines
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Description
Upgrade your engine's fuel delivery system with Mikuni's precision-engineered Large Round Main Jet. This critical component ensures accurate fuel metering for maximum power and efficiency in two-stroke and four-stroke engines.
Key Features
- Part Number FN100604-67.5: Direct replacement for Mikuni carburetor systems requiring 67.5 size main jets.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh environments.
- Large Round Design: Optimized flow characteristics for high-performance fuel delivery in racing and off-road applications.
- Exact Fitment: Precision-machined for seamless integration with Mikuni carburetor systems.
- Size 67.5: Specifically calibrated for balanced fuel-air mixture in high-output engines.
Why Choose This Product
Enhance engine performance with Mikuni's trusted fuel metering solution. The Large Round Main Jet delivers consistent fuel flow, improves throttle response, and maintains optimal engine efficiency. Its brass construction resists clogging and wear, while the precise 67.5 size ensures proper fuel metering for power gains without sacrificing reliability. Ideal for riders seeking to fine-tune their carburetor setup for racing, trail riding, or daily use.
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Upgrade your engine's fuel delivery system with Mikuni's precision-engineered Large Round Main Jet. This critical component ensures accurate fuel metering for maximum power and efficiency in two-stroke and four-stroke engines.
Key Features
- Part Number FN100604-67.5: Direct replacement for Mikuni carburetor systems requiring 67.5 size main jets.
- Brass Construction: Durable, corrosion-resistant material ensures long-lasting performance in harsh environments.
- Large Round Design: Optimized flow characteristics for high-performance fuel delivery in racing and off-road applications.
- Exact Fitment: Precision-machined for seamless integration with Mikuni carburetor systems.
- Size 67.5: Specifically calibrated for balanced fuel-air mixture in high-output engines.
Why Choose This Product
Enhance engine performance with Mikuni's trusted fuel metering solution. The Large Round Main Jet delivers consistent fuel flow, improves throttle response, and maintains optimal engine efficiency. Its brass construction resists clogging and wear, while the precise 67.5 size ensures proper fuel metering for power gains without sacrificing reliability. Ideal for riders seeking to fine-tune their carburetor setup for racing, trail riding, or daily use.| SKU | GM75C916D5 |
|---|---|
| MPN | FN100604-67.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various | Carbureted Motorcycles/ATVs | 1980-2025 |
| Yamaha | YFS200 Blaster, YZ series | 1990-2010 |
| Honda | TRX series ATVs, XR series | 1985-2005 |
| Suzuki | LT series ATVs, RM series | 1995-2020 |
Frequently Asked Questions
The main jet controls fuel flow at mid-range to full throttle engine operation. It's the primary fuel metering component for normal riding conditions.
Signs of incorrect jetting include: poor acceleration, black smoke, fouled plugs (too rich), or hesitation and lean running (too lean). Jetting depends on altitude, temperature, and engine modifications.
Jet sizes are measured in precise increments. A 67.5 is slightly richer than a 65 and leaner than a 70. Each 2.5-point increment represents a meaningful fuel flow change.
No. Jets must match your specific carburetor model. Verify your carburetor model number before purchasing. Different Mikuni carb models use different jet styles and sizes.
Yes. Common modifications requiring rejetting include: air filter changes, exhaust modifications, engine boring, or altitude changes. Consult jetting charts for your specific setup.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small screwdriver or jet removal tool
- Clean workspace
- Container for small parts
Pro Tips
- Take photos during disassembly for reference
- Use a small container to organize small parts
- Gently seat the jet - do not over-tighten
- Test run engine after installation to verify jetting
- Keep old jet for reference or backup
Common Mistakes to Avoid
- Losing the small jet in disassembly
- Cross-threading the jet when installing
- Not cleaning carburetor before reassembly
- Installing jet too tightly (can damage brass)
Durability & Warranty
Expected Lifespan
Indefinite if properly maintained; brass jets don't wear out under normal use
Warranty
Typically covered under Mikuni's standard warranty (verify with retailer)
Maintenance
No maintenance required; inspect for debris or damage during carburetor cleaning
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