Your cart is empty
Start ShoppingMIKUNI Low Speed Jet (52.5) - Precision Brass Main Jet for Carburetors
Fits your
May not fit your
Description
Upgrade your carburetor's fuel delivery system with MIKUNI's precision-engineered Low Speed Jet. This 52.5 main jet ensures optimal air-fuel ratios for enhanced power, efficiency, and engine responsiveness in two-stroke and four-stroke powersports applications.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- 52.5 Jet Size: Precisely calibrated for balanced fuel flow in high-performance engines.
- M5 x 0.75 Thread: Standard thread size for easy installation and compatibility with most carburetor systems.
- Compact Design: 10mm length and 5mm diameter for minimal flow restriction and maximum fuel atomization.
- Lightweight (0.5g): Reduces moving mass while maintaining structural integrity under pressure.
Why Choose This Product
Mikuni's Low Speed Jet delivers unmatched accuracy for fuel metering, ensuring your engine runs smoothly across diverse conditions. The brass material resists clogging and maintains consistent flow rates, while the precise 52.5 sizing caters to both stock and modified engines. Its compact profile minimizes pressure drop, making it essential for riders seeking peak performance without compromising reliability.
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
$4.95
In Cart
Upgrade your carburetor's fuel delivery system with MIKUNI's precision-engineered Low Speed Jet. This 52.5 main jet ensures optimal air-fuel ratios for enhanced power, efficiency, and engine responsiveness in two-stroke and four-stroke powersports applications.
Key Features
- Brass Construction: Durable, corrosion-resistant material for long-lasting performance in harsh environments.
- 52.5 Jet Size: Precisely calibrated for balanced fuel flow in high-performance engines.
- M5 x 0.75 Thread: Standard thread size for easy installation and compatibility with most carburetor systems.
- Compact Design: 10mm length and 5mm diameter for minimal flow restriction and maximum fuel atomization.
- Lightweight (0.5g): Reduces moving mass while maintaining structural integrity under pressure.
Why Choose This Product
Mikuni's Low Speed Jet delivers unmatched accuracy for fuel metering, ensuring your engine runs smoothly across diverse conditions. The brass material resists clogging and maintains consistent flow rates, while the precise 52.5 sizing caters to both stock and modified engines. Its compact profile minimizes pressure drop, making it essential for riders seeking peak performance without compromising reliability.
| SKU | GMA3729E90 |
|---|---|
| MPN | FN100606-52.5 |
| Brand | MIKUNI |
| Category | Intake/Carb/Fuel System |
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 |
|---|---|---|
| Honda | CRF450R | 2004-2024 |
| Kawasaki | KX450F | 2008-2024 |
| Yamaha | YZ450F | 2006-2024 |
| Suzuki | RMZ450 | 2007-2024 |
| Multiple | Various Keihin FCR equipped bikes | 1999-2024 |
Frequently Asked Questions
Fits Keihin FCR flat-slide carburetors (main jet position) found on many 4-stroke MX bikes like Honda CRF450R, Kawasaki KX450F, Yamaha YZ450F.
This is a main jet (low speed refers to smaller sizing; used for mid-to-high throttle range tuning).
Often purchased with multiple sizes (50, 52.5, 55) for complete tuning kit. Check your elevation and mods.
Carburetor modifications typically don't void engine warranty but check with manufacturer.
Start with stock size and adjust based on plug reads, EGT, or dyno tuning. Richen for safety.
Installation Guide
Difficulty
Easy
Est. Time
5 min
Tools Required
- Small flathead screwdriver
- Jet cleaning needle or wire
- Carb cleaner
Pro Tips
- Remove carburetor from bike for best access
- Use carb cleaner and compressed air to clean jet holder
- Always note original jet size before replacement
Common Mistakes to Avoid
- Not cleaning carb passages before install
- Installing without removing old jet fully
- Confusing main jet with pilot jet
Comparison vs Stock/OEM
Direct OEM-spec replacement or upgrade from Keihin stock jets
Improvements
- Precision machined brass for consistent fuel flow
- Better corrosion resistance
- Exact sizing for performance tuning
Considerations
- Same function as OEM but allows custom sizing beyond stock offerings
Durability & Warranty
Expected Lifespan
Indefinite with proper cleaning (lasts multiple rebuilds)
Warranty
Limited lifetime from Mikuni against manufacturing defects
Maintenance
Clean with carb cleaner every 10-20 hours riding; inspect for clogging
What Others Are Saying
Reviews from across the web
