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-P-8
MIKUNI
$15.49Inside diameter increases in size as size’s code increases alphabetically and numerically, Genuine Mikuni needle jets will have series and size stamping for identification, Needle jets allow a great way for tuning carb at 1/4-3/4 turn throttle, Made in...247P8- SKU:
- 247P8
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- JET SIZE:
- P-8
- MODEL:
- TYPE 247
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- TYPE:
- NEEDLE
- UNITS:
- EACH
- FEATURES:
- FOR OE YAMAHA
- RIDING STYLE:
- STREET
$15.49 -
MIKUNI Needle Jet VM38/41-Q-8
MIKUNI
$15.49Inside diameter increases in size as size’s code increases alphabetically and numerically, Genuine Mikuni needle jets will have series and size stamping for identification, Needle jets allow a great way for tuning carb at 1/4-3/4 turn throttle, Made in...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: $15.49Now: $10.00Was: $15.49Inside diameter increases in size as size’s code increases alphabetically and numerically, Genuine Mikuni needle jets will have series and size stamping for identification, Needle jets allow a great way for tuning carb at 1/4-3/4 turn throttle, Made in...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: $15.49Now: $10.00Was: $15.49 -
MIKUNI Needle Jet VM44/10-AA-0
MIKUNI
$15.49Inside diameter increases in size as size’s code increases alphabetically and numerically, Genuine Mikuni needle jets will have series and size stamping for identification, Needle jets allow a great way for tuning carb at 1/4-3/4 turn throttle, Made in...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
$15.49Inside diameter increases in size as size’s code increases alphabetically and numerically, Genuine Mikuni needle jets will have series and size stamping for identification, Needle jets allow a great way for tuning carb at 1/4-3/4 turn throttle, Made in...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
$15.49 -
MIKUNI Needle Jet 785-24001-Q-8
MIKUNI
$15.49Inside diameter increases in size as size’s code increases alphabetically and numerically, Genuine Mikuni needle jets will have series and size stamping for identification, Needle jets allow a great way for tuning carb at 1/4-3/4 turn throttle, Made in...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
$14.56Fit Mikuni carburetors VM18 (clamp on), VM24-512, VM26-512, VM26-606, TMX Series and others that originally came with 4/042 main jets, Also fit several OE applications; check dimensions before ordering, Made in JapanKM4042280- 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
$14.56Fit Mikuni carburetors VM18 (clamp on), VM24-512, VM26-512, VM26-606, TMX Series and others that originally came with 4/042 main jets, Also fit several OE applications; check dimensions before ordering, Made in JapanKM4042310- 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
$14.56Fit Mikuni carburetors VM18 (clamp on), VM24-512, VM26-512, VM26-606, TMX Series and others that originally came with 4/042 main jets, Also fit several OE applications; check dimensions before ordering, Made in JapanKM4042320- 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
$14.56Fit Mikuni carburetors VM18 (clamp on), VM24-512, VM26-512, VM26-606, TMX Series and others that originally came with 4/042 main jets, Also fit several OE applications; check dimensions before ordering, Made in JapanKM4042330- 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
$5.20Fit Mikuni carburetors VM18 (clamp on), VM24-512, VM26-512, VM26-606, TMX Series and others that originally came with 4/042 main jets, Also fit several OE applications; check dimensions before ordering, Made in JapanKM4042340- 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
$14.56Fit Mikuni carburetors VM18 (clamp on), VM24-512, VM26-512, VM26-606, TMX Series and others that originally came with 4/042 main jets, Also fit several OE applications; check dimensions before ordering, Made in JapanKM4042350- 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
$14.56Fit Mikuni carburetors VM18 (clamp on), VM24-512, VM26-512, VM26-606, TMX Series and others that originally came with 4/042 main jets, Also fit several OE applications; check dimensions before ordering, Made in JapanKM4042360- 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
$24.15Genuine Mikuni push-in type needle and seat for Super BN and BNI carburetors, Made in Japan7863501515- SKU:
- 7863501515
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
$24.15 -
MIKUNI Super BN Carburetor Series Needle Valve Assembly 786-35015-2.0
MIKUNI
$24.15Genuine Mikuni push-in type needle and seat for Super BN and BNI carburetors, Made in Japan7863501520- SKU:
- 7863501520
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
$24.15 -
MIKUNI Standard BN Carburetor Series Needle and Seat VM26/26-2.0
MIKUNI
$24.15Genuine Mikuni Needle and Seat Assembly VM262620 Ensures reliable performance for optimal engine function Precision-engineered for a perfect fit Manufactured to the highest quality standards Check compatibility with your application...VM262620- SKU:
- VM262620
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$24.15 -
WSM Keihin Low-Speed Jet 006-6060
WSM
$2.17For Keihin CDK 2 watercraft carbs, Made in Japan for WSM0066060- 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
$2.07For Keihin CDK 2 watercraft carbs, Made in Japan for WSM0066065- 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
$2.17For Keihin CDK 2 watercraft carbs, Made in Japan for WSM0066068- 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
$2.17For Keihin CDK 2 watercraft carbs, Made in Japan for WSM0066072- 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:
