Dirt Bike Carburertor Main Jets
Dirt Bike Carburetor Main Jets & Jet Needles for Mikuni Carbs on Honda, Yamaha & KTM at JJ Motorsports
Fine-tune your dirt bike's fuel mixture for optimal power and efficiency with premium carburetor main jets and jet needles from JJ Motorsports. Our selection includes high-precision brass main jets (sizes 100-140) and tapered jet needles designed for consistent mid-range performance, smooth throttle response, and easy tuning in motocross, enduro, and trail riding. Compatible with Mikuni VM series carbs on popular models like Honda CRF, Yamaha YZ/WR, Kawasaki KX, Suzuki RM, and KTM SX/EXC, these Japanese-made components ensure accurate metering, reduced lean spots, and reliable operation in dusty, high-RPM conditions. From 4/042 main jets for VM18/26 carbs to J8-series needles for mid-throttle control, stock up on the parts needed for a full carb rebuild or jetting upgrade.
Shop trusted brands like Mikuni for OEM-quality precision. Explore related categories such as dirt bike carburetor rebuild kits for complete maintenance or dirt bike air and fuel for reeds and filters.
Top Dirt Bike Carburetor Main Jets & Needles
- Mikuni Jet Needle J8-6F08 – Precision tapered jet needle for mid-range fuel control in Mikuni VM series carbs; fits various OE applications, made in Japan for smooth throttle response.
- Mikuni Main Jet #100 - 4-Pack (4/042-100) – Brass main jet pack for VM18, VM24/26, TMX carbs; 6mm diameter, 12mm length, ideal for leaner mixtures in dirt bikes.
- Mikuni Main Jet #125 - 4-Pack (4/042-125) – High-flow brass jets for richer high-RPM tuning; compatible with Mikuni VM series and OE carbs on Honda, Yamaha, and KTM models.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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MIKUNI Carburetor Rebuild Kit - BN46I Sea-Doo MK-BN46I
MIKUNI
$75.95A properly tuned carburetor is the foundation of reliable engine performance, and worn seals, gaskets, and jets rob your Sea-Doo of responsiveness and fuel efficiency. This MIKUNI rebuild kit gives you everything needed for a complete carburetor...10060285- SKU:
- 10060285
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PRODUCT NAME:
- JET KIT
- TYPE:
- CARBURETOR
- RIDING STYLE:
- WATERCRAFT
- FEATURES:
- FOR 46 MM I-SERIES CARBURETORS
- UNITS:
- KIT
$75.95 -
MIKUNI Fuel Pump Rebuild Kit - DF62 MK-DF62
MIKUNI
$25.99Fuel pump reliability is non-negotiable in high-performance applications—a failed pump leaves you stranded or worse, unable to complete a critical race or event. This genuine Mikuni rebuild kit supplies all internal sealing components needed to restore...10060286- SKU:
- 10060286
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- SNOW
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
$25.99 -
MIKUNI Fuel Pump - DF62 DF62-702
MIKUNI
$80.95A high-performance fuel system demands a pump that can deliver consistent volume under extreme conditions. The MIKUNI DF62 is purpose-built for forced induction and high-RPM applications, ensuring your engine receives fuel at the rate it demands. Whether...10060287- SKU:
- 10060287
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- MODEL:
- DF-62
- PRODUCT NAME:
- FUEL PUMP
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- EACH
$80.95 -
MIKUNI Jet Needle J8-6F04
MIKUNI
$10.50Fine-tuning your carburetor's mid-range fuel delivery is essential for smooth throttle response and consistent performance across the RPM band. The MIKUNI Jet Needle J8-6F04 is a precision component designed to optimize mixture control in the transition...6F4- SKU:
- 6F4
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- MODEL:
- J8-6F04
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$10.50 -
MIKUNI Jet Needle J8-6F05
MIKUNI
$10.50Precise fuel mixture control in the mid-range throttle position is essential for consistent performance and throttle response across varying engine loads. The MIKUNI Jet Needle J8-6F05 delivers the calibration your carbureted engine needs to optimize...6F5- SKU:
- 6F5
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- MODEL:
- J8-6F05
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$10.50 -
MIKUNI Jet Needle J8-6F08
MIKUNI
$10.50Precise fuel mixture control at mid-range throttle positions is critical to carburetor performance, and a worn or incorrect jet needle will cause hesitation, poor fuel economy, or excessive richness. The MIKUNI J8-6F08 is engineered for compatibility...6F8- SKU:
- 6F8
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- MODEL:
- J8-6F08
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$10.50 -
MIKUNI Jet Needle J8-6F09
MIKUNI
$10.50Fine-tuning your carburetor's mid-range fuel delivery directly impacts throttle response, fuel economy, and overall drivability. The MIKUNI Jet Needle J8-6F09 is a precision component designed to optimize mixture control in the critical mid-range...6F9- SKU:
- 6F9
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MODEL:
- J8-6F09
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- NEEDLE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$10.50 -
MIKUNI Jet Needle J8-6FJ40
MIKUNI
$10.50Precise mid-range fuel mixture control directly impacts throttle response and drivability across the RPM band where you spend most of your time. The MIKUNI Jet Needle J8-6FJ40 is engineered for Mikuni VM carburetors and select OE applications, delivering...6FJ40- SKU:
- 6FJ40
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- NEEDLE
- MODEL:
- J8-6FJ40
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$10.50 -
MIKUNI Jet Needle J8-6FJ41
MIKUNI
$10.50Fine-tuning your carb's mid-range fuel delivery is critical for consistent throttle response and smooth power transitions. The MIKUNI J8-6FJ41 jet needle is engineered to optimize fuel mixture in that crucial mid-range throttle window where most driving...6FJ41- SKU:
- 6FJ41
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MODEL:
- J8-6FJ41
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- NEEDLE
- PRODUCT NAME:
- JET
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$10.50 -
MIKUNI Jet Needle J8-6FL14
MIKUNI
$10.50Precise mid-range fuel delivery is essential for consistent carburetor performance across varying throttle positions, and the MIKUNI Jet Needle J8-6FL14 is engineered to dial in that critical sweet spot. Whether you're tuning a high-strung race engine or...6FL14- SKU:
- 6FL14
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MODEL:
- J8-6FL14
- RIDING STYLE:
- SNOW
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- UTV
- RIDING STYLE:
- STREET
- TYPE:
- NEEDLE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$10.50 -
MIKUNI Carburetor Rebuild Kit - BN44I Yamaha MK-BN44I-YAM
MIKUNI
$77.95A carburetor left in storage or running on old fuel will develop varnish buildup and seal deterioration that kills performance and fuel economy. This MIKUNI rebuild kit supplies all the gaskets, seals, and wear components you need to restore your BN44I...10060284- SKU:
- 10060284
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- FOR 44 MM OR 46 MM I-SERIES CARBURETORS
- PRODUCT NAME:
- JET KIT
- TYPE:
- CARBURETOR
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$77.95 -
MIKUNI Jet Needle J8-6N01
MIKUNI
$10.50Precise mid-range fueling is the foundation of responsive carburetor tuning, and the MIKUNI Jet Needle J8-6N01 delivers exactly that control. If your Mikuni VM carb feels flat or hesitant between idle and wide-open throttle, a worn or incorrect jet...6N1- SKU:
- 6N1
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- MODEL:
- J8-6N01
- PRODUCT NAME:
- JET
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- TYPE:
- NEEDLE
$10.50 -
MIKUNI Jet Needle J8-4J13
MIKUNI
$10.50Precise fuel mixture control in the mid-range throttle position is critical to carburetor performance, and the MIKUNI Jet Needle J8-4J13 delivers exactly that. This OEM-spec needle maintains the metering accuracy your engine demands during acceleration...4J13- SKU:
- 4J13
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- MODEL:
- J8-4J13
- RIDING STYLE:
- STREET
- TYPE:
- NEEDLE
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$10.50Qty in Cart: 0Quantity:Price:$10.50Subtotal: -
MIKUNI Super/HP Carburetor Series Needle Valve Kit MK-BN44 NV 1
MIKUNI
$25.99If you're running a carbureted high-performance engine, fuel delivery consistency directly impacts throttle response and peak power output. This MIKUNI needle valve kit eliminates pop-off issues that plague stock setups, allowing you to lean on higher...MKBN3844SPRN- SKU:
- MKBN3844SPRN
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- NEEDLE VALVE KIT
- SPRING RATE METRIC:
- 65.00 G
$25.99 -
MIKUNI Main Jet #100 - 4-Pack 4/042-100
MIKUNI
$5.20If your Mikuni carburetor is running lean or rich, a proper main jet swap is the fastest way to dial in your air-fuel mixture without replacing the entire carb. This 4-pack of OEM-equivalent #100 main jets gives you the flexibility to test jetting...KM4042100- SKU:
- KM4042100
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- FOR VM CARBURETORS
- OVERALL DIAMETER METRIC:
- 6.00 MM
- PRODUCT NAME:
- JET
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- MATERIAL:
- BRASS
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- 4 PACK
- JET SIZE:
- 100
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- UTV
- HEAD TYPE:
- HEX HEAD
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$5.20 -
MIKUNI Main Jet #140 - 4-Pack 4/042-140
MIKUNI
$14.56Precise jetting is the foundation of carburetor tuning—get it wrong, and you're leaving power on the table or risking a lean-running engine. The MIKUNI Main Jet #140 is the direct replacement for stock VM and TMX series carburetors, engineered to deliver...KM4042140- SKU:
- KM4042140
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- UNITS:
- 4 PACK
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- FEATURES:
- FOR VM CARBURETORS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- HEAD TYPE:
- HEX HEAD
- JET SIZE:
- 140
- MATERIAL:
- BRASS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$14.56 -
MIKUNI Main Jet - #145 - 4-Pack N102221-145
MIKUNI
$14.55Fine-tuning your carburetor's fuel delivery is critical for optimal engine performance, and jet selection directly impacts throttle response, fuel economy, and overall drivability. The MIKUNI #145 main jet delivers precise fuel metering for CV and Power...KN102221145- SKU:
- KN102221145
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 145
- MATERIAL:
- BRASS
- MODEL:
- MIKUNI
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- JET
- TYPE:
- MAIN
- UNITS:
- 4 PACK
$14.55 -
MIKUNI Main Jet - #200 - 4-Pack N102221-200
MIKUNI
$14.55If you're tuning a Mikuni carb for optimal fuel delivery and engine response, jet selection directly impacts how your engine performs across the RPM band. The #200 main jet is a critical component for matching fuel flow to your engine's displacement and...KN102221200- SKU:
- KN102221200
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 200
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 4 PACK
- MODEL:
- MIKUNI
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
$14.55 -
MIKUNI Main Jet - #80 - 4-Pack N102221-80
MIKUNI
$14.55If you're tuning a CV or Power Jet Mikuni carburetor, jet selection directly impacts your air-fuel ratio and throttle response. The #80 main jet from Mikuni is the OE replacement specification for countless applications, ensuring you're returning to...KN10222180- SKU:
- KN10222180
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 80
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- UNITS:
- 4 PACK
- MODEL:
- MIKUNI
- PRODUCT NAME:
- JET
- RIDING STYLE:
- WATERCRAFT
$14.55Qty in Cart: 0Quantity:Price:$14.55Subtotal: -
MIKUNI Main Jet - #82.5 - 4-Pack N102221-825
MIKUNI
$14.55Proper jetting is fundamental to carburetor tuning—get it wrong, and you're leaving power on the table or risking engine damage. The MIKUNI #82.5 main jet delivers precise fuel metering for mid-range and full-throttle operation, ensuring your engine runs...KN102221825- SKU:
- KN102221825
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- MAIN
- UNITS:
- 4 PACK
- JET SIZE:
- 82.5
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- BRASS
- MODEL:
- MIKUNI
- RIDING STYLE:
- OFF-ROAD
$14.55
