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 Needle Jet VM38/41-Q-8
MIKUNI
$15.49Precise carburetor tuning demands precision components, and the MIKUNI Needle Jet VM38/41-Q-8 is engineered for exactly that. This genuine Mikuni needle jet gives you granular control over fuel delivery in the critical 1/4 to 3/4 throttle range—the zone...247Q8- SKU:
- 247Q8
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- JET SIZE:
- Q-8
- MODEL:
- TYPE 247
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- FEATURES:
- FOR OE YAMAHA
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- TYPE:
- NEEDLE
$15.49 -
On Sale
MIKUNI Needle Jet VM38/41-R-4
MIKUNI
MSRP: $14.95Now: $10.00Was: $14.95Fine-tuning your carburetor's mid-range performance requires precision, and the MIKUNI Needle Jet VM38/41-R-4 delivers exactly that. This genuine Mikuni component gives you direct control over fuel delivery during the critical 1/4 to 3/4 throttle...247R4- SKU:
- 247R4
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MODEL:
- TYPE 247
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- JET SIZE:
- R-4
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- FEATURES:
- FOR OE YAMAHA
- TYPE:
- NEEDLE
MSRP: $14.95Now: $10.00Was: $14.95Qty in Cart: 0Quantity:Price:MSRP: $14.95Now: $10.00Was: $14.95Subtotal: -
MIKUNI Needle Jet VM44/10-AA-0
MIKUNI
$15.49Fine-tuning your carburetor's mid-range performance requires precise control over fuel delivery in the 1/4 to 3/4 throttle range—exactly where needle jets make their critical impact. The MIKUNI VM44/10-AA-0 is a genuine Mikuni component engineered to...224AA0- SKU:
- 224AA0
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- JET SIZE:
- AA-0
- MATERIAL:
- BRASS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- MODEL:
- TYPE 224
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- NEEDLE
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- FOR VM 40 MM - 44 MM SPIGOT
- UNITS:
- EACH
$15.49 -
MIKUNI Needle Jet 785-24001-O-0
MIKUNI
$15.49Precise mid-range throttle response separates a well-tuned carbureted engine from one that's merely adequate. The MIKUNI Needle Jet 785-24001-O-0 gives you direct control over fuel delivery in the critical 1/4 to 3/4 throttle band—the range where most...389O0- SKU:
- 389O0
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- FEATURES:
- FOR TM 32 MM - 33 MM SPIGOT
- JET SIZE:
- O-0
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- NEEDLE
- UNITS:
- EACH
- MATERIAL:
- BRASS
- MODEL:
- TYPE 389
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
$15.49Qty in Cart: 0Quantity:Price:$15.49Subtotal: -
MIKUNI Needle Jet 785-24001-Q-8
MIKUNI
$15.49Fine-tuning your carburetor's mid-range performance demands precision, and a genuine Mikuni needle jet is non-negotiable if you want consistent throttle response across the 1/4 to 3/4 opening range. This OEM component directly controls fuel atomization...389Q8- SKU:
- 389Q8
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- JET SIZE:
- Q-8
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- FEATURES:
- FOR TM 32 MM - 33 MM SPIGOT
- MATERIAL:
- BRASS
- MODEL:
- TYPE 389
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$15.49 -
MIKUNI Main Jet #280 - 4-Pack 4/042-280
MIKUNI
$14.56Precise jetting is the foundation of carburetor tuning—get it wrong and you're leaving power on the table or running dangerously lean. The MIKUNI Main Jet #280 is engineered for applications that demand a richer fuel mixture, ensuring proper atomization...KM4042280- SKU:
- KM4042280
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- 4 PACK
- JET SIZE:
- 280
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH IMPERIAL:
- 0.47'
- FEATURES:
- FOR VM CARBURETORS
- OVERALL DIAMETER METRIC:
- 6.00 MM
- PRODUCT NAME:
- JET
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
$14.56 -
MIKUNI Main Jet #310 - 4-Pack 4/042-310
MIKUNI
$14.56Carburetor tuning demands precision, and a worn or incorrect main jet directly impacts fuel delivery at full throttle—compromising both power and reliability. This genuine Mikuni #310 jet pack gives you the exact orifice sizing needed to optimize your...KM4042310- SKU:
- KM4042310
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
- FEATURES:
- FOR VM CARBURETORS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH:
- 12 MM (0,47')
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
- HEAD TYPE:
- HEX HEAD
- JET SIZE:
- 310
- MATERIAL:
- BRASS
$14.56 -
MIKUNI Main Jet #320 - 4-Pack 4/042-320
MIKUNI
$14.56Fine-tuning your carburetor's fuel delivery is critical for achieving optimal engine performance, whether you're dialing in a race engine or restoring a classic machine. The MIKUNI #320 main jet delivers precise fuel metering that directly impacts...KM4042320- SKU:
- KM4042320
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- FEATURES:
- FOR VM CARBURETORS
- JET SIZE:
- 320
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH:
- 12 MM (0,47')
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
$14.56 -
MIKUNI Main Jet #330 - 4-Pack 4/042-330
MIKUNI
$14.56Fine-tuning your carburetor's fuel delivery is critical to achieving peak performance and reliability, especially in high-demand racing applications. The MIKUNI Main Jet #330 delivers precise metering for engines that require richer fuel mixtures,...KM4042330- SKU:
- KM4042330
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- FOR VM CARBURETORS
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- JET
- RIDING STYLE:
- STREET
- HEAD TYPE:
- HEX HEAD
- JET SIZE:
- 330
- MATERIAL:
- BRASS
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 4 PACK
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
$14.56 -
MIKUNI Main Jet #340 - 4-Pack 4/042-340
MIKUNI
$5.20Tuning your Mikuni carburetor requires precision—and a mismatched main jet will cost you performance, throttle response, and reliability. This 4-pack of OEM-specification #340 main jets ensures your fuel mixture hits the sweet spot across the RPM band,...KM4042340- SKU:
- KM4042340
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- JET SIZE:
- 340
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- 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
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- UNITS:
- 4 PACK
$5.20 -
MIKUNI Main Jet #350 - 4-Pack 4/042-350
MIKUNI
$14.56Precision jetting is the foundation of carburetor tuning—get it wrong, and you're leaving horsepower on the table and risking lean-condition damage. The MIKUNI Main Jet #350 delivers the exact fuel metering your engine needs for optimal combustion across...KM4042350- SKU:
- KM4042350
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- FOR VM CARBURETORS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH IMPERIAL:
- 0.47'
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- 4 PACK
- JET SIZE:
- 350
- OVERALL DIAMETER METRIC:
- 6.00 MM
- PRODUCT NAME:
- JET
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
$14.56 -
MIKUNI Main Jet #360 - 4-Pack 4/042-360
MIKUNI
$14.56Precise fuel delivery is the foundation of carburetor tuning, and running the correct main jet is non-negotiable for optimal air-fuel ratio across the power band. The MIKUNI #360 main jet delivers consistent atomization and metering that matches OEM...KM4042360- SKU:
- KM4042360
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH IMPERIAL:
- 0.47'
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- RIDING STYLE:
- STREET
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL LENGTH:
- 12 MM (0,47')
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 4 PACK
- FEATURES:
- FOR VM CARBURETORS
- JET SIZE:
- 360
- RIDING STYLE:
- ATV
$14.56 -
MIKUNI Super BN Carburetor Series Needle Valve Assembly 786-35015-1.5
MIKUNI
$24.15A properly functioning needle valve assembly is critical to precise fuel metering in any Super BN carburetor setup—lean mixture issues, hesitation, and flooding all trace back to worn or damaged needle seats. This genuine Mikuni replacement restores OEM...7863501515- SKU:
- 7863501515
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
$24.15Qty in Cart: 0Quantity:Price:$24.15Subtotal: -
MIKUNI Super BN Carburetor Series Needle Valve Assembly 786-35015-2.0
MIKUNI
$24.15A worn or damaged needle valve directly compromises fuel delivery precision, leading to poor throttle response and unstable idle conditions. This genuine Mikuni needle and seat assembly restores the critical seal required for consistent carburetor...7863501520- SKU:
- 7863501520
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
$24.15Qty in Cart: 0Quantity:Price:$24.15Subtotal: -
MIKUNI Standard BN Carburetor Series Needle and Seat VM26/26-2.0
MIKUNI
$24.15The needle and seat assembly is the critical flow-control component in your Mikuni carburetor—wear or contamination here directly impacts fuel delivery precision and engine idle quality. A worn assembly causes hesitation, poor fuel economy, and...VM262620- SKU:
- VM262620
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$24.15 -
WSM Keihin Low-Speed Jet 006-6060
WSM
$2.17Precise low-speed fuel atomization is critical for smooth idle quality and consistent throttle response on Keihin CDK 2 carburetors. If your watercraft exhibits hesitation off the line or rough running at partial throttle, a worn or incorrectly-sized jet...0066060- SKU:
- 0066060
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- JET SIZE:
- 60
- PRODUCT NAME:
- JET
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- PILOT
$2.17 -
WSM Keihin Low-Speed Jet 006-6065
WSM
$2.07Precise fuel delivery at low engine speeds is critical for smooth acceleration and reliable cold starts on your watercraft. This OEM-spec Keihin low-speed jet ensures your CDK 2 carburetor maintains optimal air-fuel mixture during low-RPM operation,...0066065- SKU:
- 0066065
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- JET SIZE:
- 65
- TYPE:
- PILOT
- UNITS:
- EACH
- PRODUCT NAME:
- JET
- RIDING STYLE:
- WATERCRAFT
$2.07Qty in Cart: 0Quantity:Price:$2.07Subtotal: -
WSM Keihin Low-Speed Jet 006-6068
WSM
$2.17Precise low-speed jetting is critical for responsive throttle control and smooth acceleration in competitive watercraft applications. This OEM-quality Keihin jet ensures proper fuel atomization during off-plane operation and initial acceleration phases,...0066068- SKU:
- 0066068
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- PILOT
- UNITS:
- EACH
- JET SIZE:
- 68
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- JET
$2.17 -
WSM Keihin Low-Speed Jet 006-6072
WSM
$2.17Fine-tuning your watercraft's fuel delivery at low RPMs requires precision jetting that stock carburetors often fail to provide. The WSM Keihin Low-Speed Jet delivers the exact metering your engine needs during idle, acceleration, and low-throttle...0066072- SKU:
- 0066072
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- JET
- UNITS:
- EACH
- JET SIZE:
- 72
- TYPE:
- PILOT
$2.17Qty in Cart: 0Quantity:Price:$2.17Subtotal: -
WSM Keihin Low-Speed Jet 006-6075
WSM
$2.17Precise low-speed jetting is critical for smooth acceleration and throttle response in watercraft applications. A worn or incorrect jet size creates hesitation and fuel delivery inconsistencies that compound under load. The WSM Keihin Low-Speed Jet...0066075- SKU:
- 0066075
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 75
- PRODUCT NAME:
- JET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- EACH
- TYPE:
- PILOT
$2.17
