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 J8-6DH03
MIKUNI
$10.50Fitments include several Mikuni VM model and some OE Mikuni carburetors, Jet needles control the fuel mixture in the mid-range throttle position, Some jet needles don't have measurements provided by Mikuni, Use charting to verify dimensions in...6DH3- SKU:
- 6DH3
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MODEL:
- J8-6DH03
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- OFF-ROAD
$10.50 -
MIKUNI Jet Needle J8-6DH04
MIKUNI
$10.50Fitments include several Mikuni VM model and some OE Mikuni carburetors, Jet needles control the fuel mixture in the mid-range throttle position, Some jet needles don't have measurements provided by Mikuni, Use charting to verify dimensions in...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
$10.50Fitments include several Mikuni VM model and some OE Mikuni carburetors, Jet needles control the fuel mixture in the mid-range throttle position, Some jet needles don't have measurements provided by Mikuni, Use charting to verify dimensions in...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
$10.50Fitments include several Mikuni VM model and some OE Mikuni carburetors, Jet needles control the fuel mixture in the mid-range throttle position, Some jet needles don't have measurements provided by Mikuni, Use charting to verify dimensions in...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
$24.15Genuine Mikuni needle and seat assemblies provide reliable performance, Check application and size of needle and seat assembly before ordering, Made to the highest standards, Made in JapanN14904020- SKU:
- N14904020
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$24.15 -
MIKUNI Needle and Seat N149040-25
MIKUNI
$24.15Genuine Mikuni needle and seat assemblies provide reliable performance, Check application and size of needle and seat assembly before ordering, Made to the highest standards, Made in JapanN14904025- SKU:
- N14904025
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$24.15 -
MIKUNI Needle and Seat N149040-28
MIKUNI
$24.15Genuine Mikuni needle and seat assemblies provide reliable performance, Check application and size of needle and seat assembly before ordering, Made to the highest standards, Made in JapanN14904028- SKU:
- N14904028
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$24.15 -
MIKUNI Coupling Kit for Duals MK-BN/001
MIKUNI
$52.95For dual application of Mikuni carburetorsMKBN001- 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
$40.99Diaphragm repair kit for all standard Mikuni BN series carburetors (not Super BN) - six-screw pump coverMKBN3844- 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
$85.95All parts needed for complete rebuild (except needle valve)MKBN3844SPR- SKU:
- MKBN3844SPR
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- JET KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- TYPE:
- CARBURETOR
$85.95 -
MIKUNI Super/HP Carburetor Series Needle Valve Kit MK-BN44 NV 2
MIKUNI
$25.99Super BN kits fit either 38 or 44/46mm Super BN and high-performance Super BN carbs, Kit reduces pop-off and increases fuel flow for high-performance applications, 2.5 needle valve and 80g + 2.3 N-S and 65g spring, Made in JapanMKBN3844SPR2- 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
$15.49Inside 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...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
$15.49Inside 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...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
$15.49Inside 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...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
$15.49Inside 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...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
$15.49Inside 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...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
$15.49Inside 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...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
$15.49Qty in Cart: 0Quantity:Price:$15.49Subtotal: -
MIKUNI Needle Jet 990-793-004-P-6
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...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
$15.49Qty in Cart: 0Quantity:Price:$15.49Subtotal: -
MIKUNI Needle Jet 990-793-004-Q-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...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
$15.49Inside 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...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
