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Start ShoppingMIKUNI #85 Large Round Main Jet - High-Performance Brass Jet for Powersports Engines
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Description
Upgrade your carburetor's fuel delivery system with MIKUNI's #85 Large Round Main Jet. This precision-machined brass jet ensures consistent fuel flow and responsive engine performance for motorcycles, ATVs, and off-road vehicles.
Key Features
- Brass Construction: Durable, corrosion-resistant material withstands high temperatures and fuel exposure
- 0.236 Inch Orifice: Precise diameter ensures optimal fuel metering for #85 size applications
- Clip-On Design: Easy installation and adjustment for quick carburetor tuning
Why Choose This Product
MIKUNI's Large Round Main Jet offers unmatched reliability for high-performance engines. The brass material resists wear from fuel and heat, while the precise orifice size delivers consistent fuel flow. Its clip-on style simplifies installation and adjustment, making it ideal for riders seeking fine-tuned engine performance. Perfect for carbureted powersports equipment requiring accurate fuel metering.
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Upgrade your carburetor's fuel delivery system with MIKUNI's #85 Large Round Main Jet. This precision-machined brass jet ensures consistent fuel flow and responsive engine performance for motorcycles, ATVs, and off-road vehicles.
Key Features
- Brass Construction: Durable, corrosion-resistant material withstands high temperatures and fuel exposure
- 0.236 Inch Orifice: Precise diameter ensures optimal fuel metering for #85 size applications
- Clip-On Design: Easy installation and adjustment for quick carburetor tuning
Why Choose This Product
MIKUNI's Large Round Main Jet offers unmatched reliability for high-performance engines. The brass material resists wear from fuel and heat, while the precise orifice size delivers consistent fuel flow. Its clip-on style simplifies installation and adjustment, making it ideal for riders seeking fine-tuned engine performance. Perfect for carbureted powersports equipment requiring accurate fuel metering.| SKU | GMC7E32939 |
|---|---|
| MPN | FN100604-85 |
| Brand | MIKUNI |
| Category | Jets |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs (e.g., Honda XR series, Yamaha YZ/WR, Kawasaki KX, Suzuki RM) | 1980-2025 |
Frequently Asked Questions
Fits Mikuni large round main jet applications in VM26-VM40, BS32-38, TM40, HSR42/45, RS series carbs on most Japanese dirt bikes.
Use plug chop method or wideband O2 sensor. #85 is common for mid-range jetting on 250-450cc 4-strokes at sea level.
Yes, large round jets have different flow rates and fit specific Mikuni carb bodies - check your carb model.
No, Mikuni jets are not interchangeable with Keihin/PWK carbs without adapter or modification.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet cleaning wire or compressed air
Pro Tips
- Remove carb bowl, unscrew old jet with screwdriver, note position/float height. Clean jet thoroughly. Test plug chop after install to verify mixture
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing wrong jet size without re-tuning
Comparison vs Stock/OEM
Direct OEM replacement for factory Mikuni carbs
Improvements
- Precision machined brass for consistent fuel flow
- Enables custom jetting for altitude/temp/modifications
Considerations
- Genuine Mikuni preferred over cheap copies for accuracy
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning (does not wear out)
Warranty
Limited lifetime by Mikuni against manufacturing defects
Maintenance
Clean with spray carb cleaner every 10-20 hours; inspect for damage/clogging
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