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
-
MIKUNI Jet Needle J8-6DH04
MIKUNI
$10.50Fine-tuning your carburetor's mid-range fuel delivery is critical for responsive throttle control and consistent performance across the RPM band. The MIKUNI Jet Needle J8-6DH04 is a direct replacement for specific MIKUNI VM-series carburetors and OE...6DH4- SKU:
- 6DH4
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- MODEL:
- J8-6DH04
- TYPE:
- NEEDLE
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$10.50 -
MIKUNI Jet Needle J8-6DH07
MIKUNI
$10.50Fine-tuning your carburetor's mid-range fuel mixture is critical to achieving consistent throttle response and reliable performance across the RPM band. The MIKUNI Jet Needle J8-6DH07 delivers precise fuel atomization during partial throttle operation,...6DH7- SKU:
- 6DH7
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- MODEL:
- J8-6DH07
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$10.50 -
MIKUNI Jet Needle J8-6DH08
MIKUNI
$10.50Fine-tuning your carburetor's mid-range fuel delivery is critical for consistent throttle response and drivability, and a worn or incorrect jet needle is often the culprit behind hesitation or lean running. The MIKUNI J8-6DH08 is a precision-engineered...6DH8- SKU:
- 6DH8
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MODEL:
- J8-6DH08
- TYPE:
- NEEDLE
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$10.50 -
MIKUNI Needle and Seat N149040-20
MIKUNI
$24.15The needle and seat assembly is the critical control point in your carburetor's fuel delivery system—when this wears, fuel flow becomes erratic and performance suffers. A genuine Mikuni replacement ensures precise fuel metering, consistent idle quality,...N14904020- SKU:
- N14904020
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$24.15 -
MIKUNI Needle and Seat N149040-25
MIKUNI
$24.15The needle and seat assembly is the critical control point in your carburetor's fuel delivery system—precision tolerances here directly impact throttle response, fuel economy, and engine stability across the entire RPM range. A worn or damaged needle and...N14904025- SKU:
- N14904025
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$24.15 -
MIKUNI Needle and Seat N149040-28
MIKUNI
$24.15The needle and seat assembly is a critical component in carburetor fuel metering—when it wears, you'll experience flooding, lean conditions, or inconsistent jetting across the RPM range. Genuine Mikuni replacements restore precise fuel control and...N14904028- SKU:
- N14904028
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$24.15 -
MIKUNI Coupling Kit for Duals MK-BN/001
MIKUNI
$52.95Running dual Mikuni carburetors requires precision synchronization to deliver consistent fuel atomization across both units—any imbalance degrades throttle response and creates flat spots in your power band. The MIKUNI Coupling Kit (MK-BN/001) solves...MKBN001- SKU:
- MKBN001
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- JET KIT
- TYPE:
- CARBURETOR
- UNITS:
- KIT
- BASE COLOR:
- BLACK
- RIDING STYLE:
- WATERCRAFT
$52.95 -
MIKUNI Standard BN Carburetor Series Repair Kit MK-BN38/44
MIKUNI
$40.99A worn or deteriorating diaphragm can leave your Mikuni carburetor running lean, causing stumbling, hesitation, and unpredictable jetting. This repair kit restores proper fuel metering and atomization without the cost and downtime of a complete...MKBN3844- SKU:
- MKBN3844
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- JET KIT
- TYPE:
- CARBURETOR
$40.99 -
MIKUNI Super BN Series Carburetor Rebuild Kit MK-BN38/44 SPR
MIKUNI
$85.95A MIKUNI Super BN Series carburetor demands precision tuning to maintain peak performance, and worn internal components directly compromise fuel atomization and throttle response. This complete rebuild kit supplies all gaskets, seals, jets, and internal...MKBN3844SPR- SKU:
- MKBN3844SPR
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- JET KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- TYPE:
- CARBURETOR
$85.95Qty in Cart: 0Quantity:Price:$85.95Subtotal: -
MIKUNI Super/HP Carburetor Series Needle Valve Kit MK-BN44 NV 2
MIKUNI
$25.99If you're running a high-performance carbureted engine, fuel delivery consistency directly impacts throttle response and peak power output. This needle valve kit eliminates pop-off inconsistencies that plague stock setups, allowing you to dial in precise...MKBN3844SPR2- SKU:
- MKBN3844SPR2
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- NEEDLE VALVE KIT
- RIDING STYLE:
- WATERCRAFT
- SPRING RATE METRIC:
- 80.00 G
- UNITS:
- KIT
$25.99 -
MIKUNI Needle Jet VM34/05-O-6
MIKUNI
$15.49Fine-tuning your carburetor's mid-range performance requires precision, and the MIKUNI Needle Jet VM34/05-O-6 delivers exactly that. This genuine Mikuni component allows you to dial in the critical 1/4 to 3/4 throttle range—where most real-world riding...159O6- SKU:
- 159O6
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- JET SIZE:
- O-6
- MODEL:
- TYPE 159
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$15.49 -
MIKUNI Needle Jet VM34/05-O-8
MIKUNI
$15.49Precision carburetor tuning demands components built to exacting standards, and the genuine MIKUNI Needle Jet VM34/05-O-8 delivers exactly that. This OEM-spec needle jet gives you direct control over fuel delivery in the critical 1/4 to 3/4 throttle...159O8- SKU:
- 159O8
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- UTV
- TYPE:
- NEEDLE
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- SNOW
- JET SIZE:
- O-8
- MATERIAL:
- BRASS
- MODEL:
- TYPE 159
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$15.49 -
MIKUNI Needle Jet 990-793-004-P-0
MIKUNI
$15.49Precise carburetor tuning separates competitive racers from the rest, and needle jets are essential for dialing in your mid-range throttle response. The MIKUNI 990-793-004-P-0 needle jet gives you granular control over fuel delivery at 1/4 to 3/4...159P0- SKU:
- 159P0
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- NEEDLE
- UNITS:
- EACH
- MATERIAL:
- BRASS
- MODEL:
- TYPE 159
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- JET SIZE:
- P-0
$15.49 -
MIKUNI Needle Jet 990-793-004-P-2
MIKUNI
$15.49Fine-tuning your carburetor's mid-range performance requires precision, and a genuine Mikuni needle jet is the tool that delivers it. The needle jet directly controls fuel delivery during the critical 1/4 to 3/4 throttle range—where most real-world...159P2- SKU:
- 159P2
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MATERIAL:
- BRASS
- MODEL:
- TYPE 159
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- JET SIZE:
- P-2
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
$15.49 -
MIKUNI Needle Jet 990-793-004-P-4
MIKUNI
$15.49Fine-tuning your carburetor's mid-range performance requires precision, and the MIKUNI Needle Jet 990-793-004-P-4 delivers exactly that. This genuine Mikuni component gives you direct control over fuel metering in the critical 1/4 to 3/4 throttle...159P4- SKU:
- 159P4
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- BRASS
- MODEL:
- TYPE 159
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- SNOW
- JET SIZE:
- P-4
- PRODUCT NAME:
- JET
- RIDING STYLE:
- UTV
- TYPE:
- NEEDLE
$15.49 -
MIKUNI Needle Jet 990-793-004-P-5
MIKUNI
$15.49Fine-tuning your carburetor's mid-range performance requires precision, and the MIKUNI Needle Jet 990-793-004-P-5 delivers exactly that. This genuine Mikuni component gives you direct control over fuel-air mixture at 1/4 to 3/4 throttle opening—the RPM...159P5- SKU:
- 159P5
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- BRASS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- TYPE 159
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- JET SIZE:
- P-5
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
$15.49 -
MIKUNI Needle Jet 990-793-004-P-6
MIKUNI
$15.49Precise carburetor tuning requires the right needle jet, and the MIKUNI 990-793-004-P-6 delivers the mid-range fuel curve adjustments serious tuners demand. Whether you're dialing in a 1/4-throttle cruising sweet spot or optimizing 3/4-throttle...159P6- SKU:
- 159P6
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- BRASS
- MODEL:
- TYPE 159
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- JET SIZE:
- P-6
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$15.49 -
MIKUNI Needle Jet 990-793-004-Q-0
MIKUNI
$15.49Precise carburetor tuning separates a dialed-in engine from one that merely runs. The MIKUNI Needle Jet 990-793-004-Q-0 gives you direct control over fuel delivery in the critical 1/4 to 3/4 throttle range, where most street and track driving happens. As...159Q0- SKU:
- 159Q0
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MODEL:
- TYPE 159
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- JET SIZE:
- Q-0
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$15.49 -
MIKUNI Needle Jet 990-793-003-P-0
MIKUNI
$15.49Carburetor tuning at part-throttle conditions requires precision—and that's where needle jets make their impact. The MIKUNI 990-793-003-P-0 is a genuine Mikuni component engineered to give you direct control over fuel atomization in the 1/4 to 3/4...166P0- SKU:
- 166P0
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- JET SIZE:
- P-0
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- UNITS:
- EACH
- FEATURES:
- FOR VM38 MM SPIGOT
- MATERIAL:
- BRASS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- TYPE 166
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$15.49 -
MIKUNI Needle Jet 990-793-003-P-2
MIKUNI
$15.49Precise mid-range throttle response is critical to dialing in your carbureted engine, and needle jet selection directly controls fuel delivery in the 1/4 to 3/4 throttle window where most driving occurs. The genuine MIKUNI Needle Jet 990-793-003-P-2 is...166P2- SKU:
- 166P2
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MODEL:
- TYPE 166
- FEATURES:
- FOR VM38 MM SPIGOT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- JET SIZE:
- P-2
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- NEEDLE
$15.49
