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Start ShoppingMIKUNI Large Round Main Jet 72.5 - High-Performance Fuel Control for Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with the MIKUNI Large Round Main Jet 72.5. This essential carburetor component ensures precise fuel metering for smooth mid-range power and peak performance at full throttle, delivering consistent engine operation across all riding conditions.
Key Features
- Large Round Design: Optimized fuel flow geometry for enhanced mid-range torque and throttle response.
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- Standard Mikuni Thread: Universal compatibility with most Mikuni carburetor models for easy installation.
- 72.5 Size Specification: Engineered for precise fuel delivery in mid-range to full throttle operation.
- Negligible Weight: Lightweight design minimizes impact on engine balance and performance.
Why Choose This Product
Whether you're tuning a motorcycle, ATV, or UTV, the MIKUNI Large Round Main Jet 72.5 offers unmatched reliability and precision. Its brass construction resists clogging and wear, while the standard thread design ensures seamless integration with existing carburetor systems. Riders benefit from smoother power delivery, improved throttle response, and consistent fuel efficiency—making it a must-have for serious powersports enthusiasts seeking peak engine performance.
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Upgrade your powersports engine's fuel delivery system with the MIKUNI Large Round Main Jet 72.5. This essential carburetor component ensures precise fuel metering for smooth mid-range power and peak performance at full throttle, delivering consistent engine operation across all riding conditions.
Key Features
- Large Round Design: Optimized fuel flow geometry for enhanced mid-range torque and throttle response.
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- Standard Mikuni Thread: Universal compatibility with most Mikuni carburetor models for easy installation.
- 72.5 Size Specification: Engineered for precise fuel delivery in mid-range to full throttle operation.
- Negligible Weight: Lightweight design minimizes impact on engine balance and performance.
Why Choose This Product
Whether you're tuning a motorcycle, ATV, or UTV, the MIKUNI Large Round Main Jet 72.5 offers unmatched reliability and precision. Its brass construction resists clogging and wear, while the standard thread design ensures seamless integration with existing carburetor systems. Riders benefit from smoother power delivery, improved throttle response, and consistent fuel efficiency—making it a must-have for serious powersports enthusiasts seeking peak engine performance.
| SKU | GMD37CEF04 |
|---|---|
| MPN | FN100604-72.5 |
| Brand | MIKUNI |
| Category | Jets |
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Frequently Asked Questions
The main jet controls fuel flow through the main fuel circuit, which operates from approximately mid-throttle to full throttle. It's one of the primary tuning components for adjusting air-fuel ratio at higher engine loads.
Jet selection depends on your carburetor model, altitude, temperature, and engine modifications. Consult your carburetor manual or contact Mikuni directly. A 72.5 is a mid-range size; larger numbers = richer mixture, smaller numbers = leaner mixture.
No. Different Mikuni carburetors use different jet sizes and thread types. Verify your carburetor model (e.g., VM26, TM24, etc.) before purchasing. The FN100604 designation indicates this is a large round jet compatible with specific Mikuni models.
The pilot jet controls fuel at idle and low throttle openings. The main jet controls fuel at mid-to-high throttle. Both work together to create the complete fuel curve across all throttle positions.
Yes. Common modifications like air filter upgrades, exhaust changes, or engine tuning typically require rejetting to maintain proper air-fuel ratio and performance.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- Screwdriver (Phillips or flat-head, depending on carburetor bowl screws)
- Small wrench or socket (for jet removal)
- Clean cloth or paper towels
- Small container for small parts
Pro Tips
- Drain fuel tank and carburetor before starting
- Take photos during disassembly for reference
- Keep all small parts organized in a container
- Use gentle pressure when removing/installing jets to avoid stripping
- Clean carburetor bowl while it's open
- Replace gaskets if they appear worn or damaged
- Test ride and verify jetting is correct for your conditions
Common Mistakes to Avoid
- Losing small O-rings or gaskets during disassembly
- Over-tightening jets (can damage brass)
- Not cleaning carburetor bowl before reassembly
- Installing jet backwards or in wrong position
- Forgetting to drain fuel before opening carburetor
Durability & Warranty
Expected Lifespan
Indefinite if not damaged; brass jets don't wear out under normal use
Warranty
Typically covered under Mikuni's standard warranty; check with retailer
Maintenance
No maintenance required; inspect for damage or clogging if carburetor runs poorly
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