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Start ShoppingMIKUNI Large Round Main Jet 62.5 - High-Performance Brass Jet for Powersports Engines
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Description
Upgrade your powersports engine's fuel delivery system with MIKUNI's Large Round Main Jet (62.5). This high-quality brass jet ensures precise fuel metering for improved throttle response, power output, and engine efficiency. Ideal for carburetor tuning in motorcycles, ATVs, and off-road vehicles.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- 62.5 Jet Size: Optimized fuel flow for high-performance engines and modified powerplants.
- M5 x 0.75 Thread: Standard thread size ensures easy installation and compatibility with MIKUNI carburetors.
- 5.8mm Orifice Diameter: Precise fuel delivery for balanced air-fuel ratios and smooth engine operation.
- 0.5g Lightweight Design: Reduces moving parts mass for faster throttle response and improved engine dynamics.
Why Choose This Product
Mikuni jets are trusted by racers and enthusiasts for their reliability and precision. This 62.5 main jet delivers consistent fuel flow, enhances engine responsiveness, and supports peak performance across a range of riding conditions. Its compact design and durable brass construction make it a must-have for carburetor tuning and engine optimization.
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Upgrade your powersports engine's fuel delivery system with MIKUNI's Large Round Main Jet (62.5). This high-quality brass jet ensures precise fuel metering for improved throttle response, power output, and engine efficiency. Ideal for carburetor tuning in motorcycles, ATVs, and off-road vehicles.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- 62.5 Jet Size: Optimized fuel flow for high-performance engines and modified powerplants.
- M5 x 0.75 Thread: Standard thread size ensures easy installation and compatibility with MIKUNI carburetors.
- 5.8mm Orifice Diameter: Precise fuel delivery for balanced air-fuel ratios and smooth engine operation.
- 0.5g Lightweight Design: Reduces moving parts mass for faster throttle response and improved engine dynamics.
Why Choose This Product
Mikuni jets are trusted by racers and enthusiasts for their reliability and precision. This 62.5 main jet delivers consistent fuel flow, enhances engine responsiveness, and supports peak performance across a range of riding conditions. Its compact design and durable brass construction make it a must-have for carburetor tuning and engine optimization.
| SKU | GMA2E18AEB |
|---|---|
| MPN | FN100604-62.5 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Universal | Mikuni VM, TM, HSR series carburetors | 1980-2025 |
| Honda | CRF250R, CRF450R, XR400R, XR650R | 1990-2024 |
| Yamaha | YZ250F, YZ450F, WR250F, WR450F | 1985-2024 |
| Kawasaki | KX250F, KX450F, KLX300 | 1990-2024 |
Frequently Asked Questions
Fits Mikuni VM26-VM44, TM40, HSR42/45 carburetors with large round main jet port. Measure your existing jet or check carb model.
Check spark plug color (chocolate brown = correct), or use jet kit calculator based on altitude, temperature, mods, and exhaust.
Yes - large round jets (FN100604 series) have 5.8mm orifice vs small round (4.1mm). Check your carb's jet holder.
Yes - any air filter, exhaust, or altitude change requires rejetting. This is just one main jet size.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet wrench (optional)
- Flashlight
Pro Tips
- Clean carb thoroughly before changing jets
- Use carb cleaner on new jet before install
- Record your old jet size
- Make small changes (2.5-5% at a time)
- Check plug color after 20 minutes riding
Common Mistakes to Avoid
- Using wrong jet style (round vs flat)
- Not cleaning carb passages before install
- Incorrect jet sizing calculation
Comparison vs Stock/OEM
OEM-equivalent precision brass construction, same specs as factory Mikuni jets
Improvements
- Consistent flow rates between batches
- Pure brass material (no cheap alloys)
- Laser-etched sizing for identification
Considerations
- Must calculate proper size for your setup - not one-size-fits-all
Durability & Warranty
Expected Lifespan
Indefinite (doesn't wear out)
Warranty
Limited lifetime (manufacturing defects)
Maintenance
Inspect for debris during carb cleaning. Clean with carb cleaner only.
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