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 785-24001-P-2
MIKUNI
$15.49Fine-tuning your carburetor's mid-range performance requires precision, and the MIKUNI Needle Jet 785-24001-P-2 delivers exactly that. This genuine Mikuni component gives you direct control over fuel delivery in the critical 1/4 to 3/4 throttle range—the...389P2- SKU:
- 389P2
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- BRASS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- NEEDLE
- FEATURES:
- FOR TM 32 MM - 33 MM SPIGOT
- MODEL:
- TYPE 389
- JET SIZE:
- P-2
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$15.49Qty in Cart: 0Quantity:Price:$15.49Subtotal: -
MIKUNI Main Jet #290 - 4-Pack 4/042-290
MIKUNI
$14.56Proper jetting is fundamental to carburetor performance—too lean and you risk engine damage, too rich and you sacrifice efficiency and throttle response. The MIKUNI Main Jet #290 is a precision-engineered component that ensures your carb delivers the...KM4042290- SKU:
- KM4042290
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- ATV
- UNITS:
- 4 PACK
- FEATURES:
- FOR VM CARBURETORS
- JET SIZE:
- 290
- PRODUCT NAME:
- JET
- RIDING STYLE:
- STREET
- HEAD TYPE:
- HEX HEAD
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- MATERIAL:
- BRASS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
$14.56 -
WSM Keihin Low-Speed Jet 006-6090
WSM
$2.07Fine-tuning your watercraft's fuel mixture at low RPMs requires a precision component that won't compromise throttle response or cold-start performance. The WSM Keihin Low-Speed Jet 006-6090 delivers exact fuel atomization during idle and low-speed...0066090- SKU:
- 0066090
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- PILOT
- UNITS:
- EACH
- JET SIZE:
- 90
- PRODUCT NAME:
- JET
- RIDING STYLE:
- WATERCRAFT
$2.07Qty in Cart: 0Quantity:Price:$2.07Subtotal: -
WSM Keihin High-Speed Jet 006-7120
WSM
$2.17Proper jetting is foundational to carburettor performance, and this WSM Keihin high-speed jet delivers the precision fuel metering your watercraft engine demands under sustained throttle conditions. Whether you're fine-tuning for altitude changes, fuel...0067120- SKU:
- 0067120
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- MODEL:
- KEIHIN
- PRODUCT NAME:
- JET
- TYPE:
- MAIN
- JET SIZE:
- 120
- MATERIAL:
- BRASS
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$2.17 -
WSM Keihin High-Speed Jet 006-7150
WSM
$2.17Precise fuel atomization is critical for consistent carburetor performance in high-demand watercraft applications. The WSM Keihin High-Speed Jet 006-7150 delivers optimized fuel delivery tuning for Keihin CDK 2 carburetors, ensuring reliable throttle...0067150- SKU:
- 0067150
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MODEL:
- KEIHIN
- JET SIZE:
- 150
- PRODUCT NAME:
- JET
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- MAIN
- MATERIAL:
- BRASS
- UNITS:
- EACH
$2.17 -
WSM Keihin High-Speed Jet 006-7155
WSM
$2.07Precision fuel delivery is non-negotiable in high-performance watercraft applications, and this WSM Keihin High-Speed Jet ensures optimal atomization and carburetor responsiveness across the RPM band. If you're running a Keihin CDK 2 carb system and...0067155- SKU:
- 0067155
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- BRASS
- JET SIZE:
- 155
- TYPE:
- MAIN
- MODEL:
- KEIHIN
- PRODUCT NAME:
- JET
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$2.07Qty in Cart: 0Quantity:Price:$2.07Subtotal: -
WSM Keihin High-Speed Jet 006-7162
WSM
$2.07Precise fuel atomization is critical for consistent engine performance, and a worn or incorrect jet size directly impacts throttle response and fuel economy. The WSM Keihin High-Speed Jet 006-7162 is engineered for Keihin CDK 2 carburetors, delivering...0067162- SKU:
- 0067162
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- WATERCRAFT
- JET SIZE:
- 162
- MODEL:
- KEIHIN
- MATERIAL:
- BRASS
- UNITS:
- EACH
- TYPE:
- MAIN
$2.07Qty in Cart: 0Quantity:Price:$2.07Subtotal: -
MIKUNI Main Jet - #110 - 4-Pack N102221-110
MIKUNI
$14.55If you're tuning a Mikuni carburetor or replacing a worn main jet, the #110 specification is critical to your fuel delivery precision. A properly sized main jet ensures optimal air-fuel mixture at mid-to-high throttle positions, directly affecting...KN102221110- SKU:
- KN102221110
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 110
- MATERIAL:
- BRASS
- MODEL:
- MIKUNI
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- JET
- TYPE:
- MAIN
- UNITS:
- 4 PACK
$14.55 -
WSM Keihin High-Speed Jet 006-7140
WSM
$2.17Precision jetting is foundational to carburetor performance, and undersized or oversized jets compromise fuel delivery across your RPM range. The WSM Keihin High-Speed Jet 006-7140 ensures optimal fuel atomization at peak engine speeds, delivering...0067140- SKU:
- 0067140
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- EACH
- JET SIZE:
- 140
- PRODUCT NAME:
- JET
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- BRASS
- MODEL:
- KEIHIN
- TYPE:
- MAIN
$2.17Qty in Cart: 0Quantity:Price:$2.17Subtotal: -
MIKUNI Needle Jet 990-793-004-Q-5
MIKUNI
$15.49Precise carburetor tuning separates a well-running engine from a truly dialed-in performance machine. The MIKUNI Needle Jet 990-793-004-Q-5 gives you granular control over fuel delivery in the critical 1/4-3/4 throttle range, where most street and track...159Q5- SKU:
- 159Q5
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- MODEL:
- TYPE 159
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- JET SIZE:
- Q-5
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MATERIAL:
- BRASS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$15.49 -
MIKUNI Pilot Jet #70 4-Pack VM22/210-70
MIKUNI
$14.55A properly sized pilot jet is fundamental to carburetor tuning—it directly controls fuel delivery at idle and low-throttle conditions, where engine responsiveness and smooth operation are critical. If your VM, TM, or TMX carb isn't delivering clean,...KM570- SKU:
- KM570
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 70
- TYPE:
- PILOT
- COLOR/FINISH:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- UNITS:
- 4 PACK
- BASE COLOR:
- BRASS
- FEATURES:
- FOR VM CARBURETORS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- HEAD DIAMETER METRIC:
- 4.00 MM
- MATERIAL:
- BRASS
- OVERALL LENGTH METRIC:
- 14.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$14.55 -
MIKUNI Main Jet #150 - 4-Pack 4/042-150
MIKUNI
$14.56A properly sized main jet is critical for carb tuning—it directly controls fuel delivery at mid-to-high throttle openings, affecting power output, throttle response, and engine longevity. The #150 jet is a common baseline or step-up size for Mikuni...KM4042150- SKU:
- KM4042150
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 150
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- SNOW
- UNITS:
- 4 PACK
- FEATURES:
- FOR VM CARBURETORS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- 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
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
$14.56 -
MIKUNI Main Jet #270 - 4-Pack 4/042-270
MIKUNI
$5.20Precise jetting is fundamental to carburetor tuning—running the wrong main jet compromises fuel delivery, throttle response, and engine reliability. This Mikuni #270 main jet 4-pack gives you the exact specification needed for proper air-fuel mixture...KM4042270- SKU:
- KM4042270
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- UNITS:
- 4 PACK
- FEATURES:
- FOR VM CARBURETORS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- HEAD TYPE:
- HEX HEAD
- JET SIZE:
- 270
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- MATERIAL:
- BRASS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- UTV
$5.20 -
MIKUNI Main Jet #165 - 4-Pack 4/042-165
MIKUNI
$5.20Proper jetting is the foundation of carburetor performance—too lean and you risk engine damage, too rich and you lose power and efficiency. The MIKUNI Main Jet #165 is the precise calibration your Mikuni carb needs for optimal fuel delivery across your...KM4042165- SKU:
- KM4042165
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- JET SIZE:
- 165
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- UNITS:
- 4 PACK
- FEATURES:
- FOR VM CARBURETORS
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH IMPERIAL:
- 0.47'
- PRODUCT NAME:
- JET
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
$5.20 -
MIKUNI Main Jet #120 - 4-Pack 4/042-120
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 JapanKM4042120- SKU:
- KM4042120
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- 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
- FEATURES:
- FOR VM CARBURETORS
- JET SIZE:
- 120
- OVERALL DIAMETER METRIC:
- 6.00 MM
- PRODUCT NAME:
- JET
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
$14.56
