Your cart is empty
Start ShoppingMIKUNI Large Round Main Jet 157.5 - High-Performance Brass Jet for Precision Fuel Delivery
Fits your
May not fit your
Description
Upgrade your MIKUNI carburetor's fuel delivery system with this precision-engineered Large Round Main Jet. Designed for high-performance engines, this 157.5mm brass jet delivers consistent fuel flow for smoother power output and reliable operation.
Key Features
- Jet Size: 157.5mm - Optimized for precise fuel metering in high-output engines
- Brass Material - Durable, corrosion-resistant construction for long-lasting performance
- M5 x 0.75 Thread - Standard thread size ensures easy installation and compatibility
- 6.5mm Outer Diameter - Streamlined design reduces flow restrictions while maintaining structural integrity
- 0.5g Weight - Lightweight yet robust for responsive fuel delivery
Why Choose This Product
Whether you're tuning a racing engine or optimizing a street bike, this MIKUNI main jet offers unmatched precision. Its brass construction resists clogging and maintains consistent flow under varying conditions. The standardized thread size ensures seamless integration with existing carburetor setups, while the compact design minimizes pressure drop for smoother throttle response. Riders will appreciate the balanced fuel-air mixture that enhances power delivery without sacrificing engine longevity.
Delivery
Checking availability...
Estimated arrival
Order within to ship today
Orders ship
Shipping to
Enter your ZIP code for delivery estimate
Price Match Guarantee
Found it cheaper?
Log in to submit a price match request.
Price
Quantity
Free Shipping $100+
14-Day Returns
Secure Checkout
Price Match
Complete the Build
This item
$19.80
In Cart
Upgrade your MIKUNI carburetor's fuel delivery system with this precision-engineered Large Round Main Jet. Designed for high-performance engines, this 157.5mm brass jet delivers consistent fuel flow for smoother power output and reliable operation.
Key Features
- Jet Size: 157.5mm - Optimized for precise fuel metering in high-output engines
- Brass Material - Durable, corrosion-resistant construction for long-lasting performance
- M5 x 0.75 Thread - Standard thread size ensures easy installation and compatibility
- 6.5mm Outer Diameter - Streamlined design reduces flow restrictions while maintaining structural integrity
- 0.5g Weight - Lightweight yet robust for responsive fuel delivery
Why Choose This Product
Whether you're tuning a racing engine or optimizing a street bike, this MIKUNI main jet offers unmatched precision. Its brass construction resists clogging and maintains consistent flow under varying conditions. The standardized thread size ensures seamless integration with existing carburetor setups, while the compact design minimizes pressure drop for smoother throttle response. Riders will appreciate the balanced fuel-air mixture that enhances power delivery without sacrificing engine longevity.| SKU | GMBF80458D |
|---|---|
| MPN | FN100604-157.5 |
| Brand | MIKUNI |
| Category | Jets |
0.0
0 reviews
0
Log in to write a review.
Reviews
No reviews yet. Be the first to review this product!
Featured Review
| Make | Model | Years |
|---|---|---|
| Various Japanese | Carbureted motorcycles/ATVs (Keihin/Mikuni carbs) | 1980-2025 |
| Honda | XR series (XR250R, XR400R, XR650R) | 1990-2010 |
| Yamaha | PW50, YZ125/250, WR250F | 2000-2020 |
Frequently Asked Questions
Fits Mikuni VM, PJ, BS30/34/36/38/40 series carbs. Confirm your carb model.
Depends on altitude, temperature, mods. Start with stock size and adjust 2-5 sizes richer/leaner based on plug reads.
No, Mikuni large round differs from Keihin round/slotted. Check carb brand.
Yes, direct replacement for worn/stock main jets.
No, reuse existing o-rings or purchase separately.
Installation Guide
Difficulty
Easy
Est. Time
10 min
Tools Required
- Small flathead screwdriver
- Jet wrench or needle nose pliers
- Carb cleaner
Pro Tips
- Remove carb completely for best access
- Note original jet size before removal
- Use carb cleaner to clear jets after install
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing wrong size jet
- Damaging o-ring/emulsion tube
Comparison vs Stock/OEM
OEM equivalent, often identical to factory jets
Improvements
- Consistent flow rates
- Precision machining
- Replacement for worn factory jets
Considerations
- Genuine Mikuni preferred over cheap copies for accuracy
Durability & Warranty
Expected Lifespan
Indefinite (until clogged or worn)
Warranty
Limited manufacturer warranty
Maintenance
Clean during carb service (every 20-50 hours), inspect for debris
What Others Are Saying
Reviews from across the web
