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
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MIKUNI Main Jet #680 - 4-Pack 4/042-680
MIKUNI
$5.20If your Mikuni carb is running rich or you're tuning for different elevation or fuel type, a jet change is one of the most direct ways to dial in your air-fuel ratio without expensive remapping. The #680 main jet gives you precise fuel metering for...KM4042680- SKU:
- KM4042680
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
- FEATURES:
- FOR VM CARBURETORS
- JET SIZE:
- 680
- 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
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
$5.20 -
MIKUNI Main Jet #70 - 4-Pack 4/042-70
MIKUNI
$5.20A properly sized main jet is critical to carburetor tuning—too rich and you'll sacrifice fuel economy and throttle response, too lean and you risk engine damage. The MIKUNI #70 main jet delivers the precise fuel metering your carb needs for optimal...KM404270- SKU:
- KM404270
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD TYPE:
- HEX HEAD
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- FEATURES:
- FOR VM CARBURETORS
- JET SIZE:
- 70
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
- MATERIAL:
- BRASS
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 4 PACK
- 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:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$5.20 -
MIKUNI Main Jet #700 - 4-Pack 4/042-700
MIKUNI
$5.20If your Mikuni carburetor is running rich or lean, a proper main jet is essential for precise fuel delivery and optimal engine performance across your RPM range. This OEM-spec #700 jet ensures crisp throttle response and consistent power, whether you're...KM4042700- SKU:
- KM4042700
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- 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
- JET SIZE:
- 700
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
$5.20 -
MIKUNI Main Jet #75 - 4-Pack 4/042-75
MIKUNI
$5.20Upgrading your main jet is one of the most direct ways to dial in your Mikuni carburetor's fuel delivery for optimal performance and throttle response. Whether you're tuning a high-revving engine, adjusting for altitude or ambient conditions, or...KM404275- SKU:
- KM404275
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- FOR VM CARBURETORS
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
- UNITS:
- 4 PACK
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- SNOW
- JET SIZE:
- 75
- OVERALL LENGTH METRIC:
- 12 MM
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$5.20 -
MIKUNI Main Jet #80 - 4-Pack 4/042-80
MIKUNI
$5.20Fine-tuning your carburetor's fuel delivery is essential for consistent performance across varying conditions, and a quality main jet is the foundation of proper air-fuel mixture control. The MIKUNI #80 main jet delivers precise fuel metering that...KM404280- SKU:
- KM404280
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- FEATURES:
- FOR VM CARBURETORS
- JET SIZE:
- 80
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
- UNITS:
- 4 PACK
- OVERALL LENGTH METRIC:
- 12 MM
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL DIAMETER METRIC:
- 6.00 MM
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$5.20 -
MIKUNI Main Jet #85 - 4-Pack 4/042-85
MIKUNI
$14.56Running a rich fuel mixture or need to adjust jetting for altitude and temperature changes? The MIKUNI Main Jet #85 is a direct replacement that restores proper fuel delivery and engine response across your operating range. Whether you're fine-tuning a...KM404285- SKU:
- KM404285
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 85
- OVERALL DIAMETER METRIC:
- 6.00 MM
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL LENGTH:
- 12 MM (0,47')
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- UNITS:
- 4 PACK
- FEATURES:
- FOR VM CARBURETORS
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
$14.56 -
MIKUNI Main Jet #90 - 4-Pack 4/042-90
MIKUNI
$14.56Proper jetting is the foundation of carburetor tuning—get it wrong, and you're leaving horsepower on the table or risking lean-condition damage. The MIKUNI Main Jet #90 delivers the precise fuel metering your engine needs for optimal performance across...KM404290- SKU:
- KM404290
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 90
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- UNITS:
- 4 PACK
- FEATURES:
- FOR VM CARBURETORS
- OVERALL LENGTH METRIC:
- 12 MM
$14.56 -
MIKUNI Main Jet #95 - 4-Pack 4/042-95
MIKUNI
$14.56Precise jetting is the foundation of carburetor tuning—running too lean or rich costs you power, fuel economy, and engine reliability. The MIKUNI Main Jet #95 delivers the exact fuel metering your engine needs for optimal performance across your RPM...KM404295- SKU:
- KM404295
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- FOR VM CARBURETORS
- JET SIZE:
- 95
- OVERALL LENGTH METRIC:
- 12 MM
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- UNITS:
- 4 PACK
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH:
- 12 MM (0,47')
- RIDING STYLE:
- OFF-ROAD
$14.56 -
MIKUNI Super BN Carburetor Series Needle Valve Assembly 786-35015-2.5
MIKUNI
$24.15A properly functioning needle valve assembly is critical to carburetor fuel delivery precision—this genuine Mikuni component ensures consistent atomization and metering across throttle positions. If your Super BN or BNI carburetor is running lean, rich,...7863501525- SKU:
- 7863501525
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
$24.15 -
MIKUNI Needle Valve Assembly 786-46001-1.5
MIKUNI
$24.15The needle and seat assembly is critical to precise fuel metering in your carburettor—a worn or damaged unit directly compromises throttle response, fuel economy, and engine reliability. Genuine Mikuni assemblies maintain the exacting tolerances required...7864600115- SKU:
- 7864600115
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- THREAD DIAMETER METRIC:
- 10.00 MM
- THREAD LENGTH METRIC:
- 7.00 MM
- UNITS:
- EACH
- RIDING STYLE:
- ATV
- HEAD TYPE:
- PUSH-IN
- JET SIZE:
- 1.5
- PRODUCT NAME:
- NEEDLE AND SEAT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$24.15 -
MIKUNI Needle and Seat 786-46001-1.8
MIKUNI
$24.15A properly functioning needle and seat assembly is critical for precise fuel delivery and carburetor performance. The Mikuni 786-46001-1.8 delivers the OEM reliability you need to maintain consistent jetting and prevent lean-running conditions. Whether...7864600118- SKU:
- 7864600118
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
$24.15 -
MIKUNI Needle and Seat 786-46001-2.0
MIKUNI
$24.15A worn or damaged needle and seat directly compromises fuel atomization and carburetor response, leading to poor throttle control and inconsistent jetting across RPM ranges. The Mikuni 786-46001-2.0 is a genuine OEM assembly engineered to restore precise...7864600120- SKU:
- 7864600120
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
$24.15 -
MIKUNI Jet Needle J8-7F06
MIKUNI
$10.50Fine-tuning your carburetor's mid-range fuel mixture requires precision, and the MIKUNI Jet Needle J8-7F06 delivers exactly that. This OEM-spec component directly controls fuel atomization during partial throttle operation—the RPM band where most street...7F6- SKU:
- 7F6
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- MODEL:
- J8-7F06
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
$10.50 -
MIKUNI Jet Needle J8-7F07
MIKUNI
$10.50The MIKUNI Jet Needle J8-7F07 is essential for fine-tuning your carburetor's fuel mixture in the critical mid-range throttle band, where most real-world riding happens. Proper needle selection directly impacts throttle response, fuel economy, and engine...7F7- SKU:
- 7F7
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- J8-7F07
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$10.50 -
MIKUNI Jet Needle J8-5DP07
MIKUNI
$10.50Precision fuel metering in the mid-range throttle zone is critical for consistent performance and drivability across varying load conditions. The MIKUNI Jet Needle J8-5DP07 delivers the exact fuel mixture control your carburetor demands, ensuring smooth...5DP7- SKU:
- 5DP7
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- NEEDLE
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MODEL:
- J8-5DP07
$10.50 -
MIKUNI Jet Needle J8-5FP17
MIKUNI
$10.50Precise fuel metering in the mid-range throttle position is critical for consistent engine performance, and the MIKUNI Jet Needle J8-5FP17 delivers exactly that. Whether you're tuning a stock Mikuni carburetor or optimizing a high-performance setup, this...5FP17- SKU:
- 5FP17
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- NEEDLE
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MODEL:
- J8-5FP17
$10.50 -
MIKUNI Jet Needle J8-5L01
MIKUNI
$10.50Precise mid-range fuel delivery is critical for responsive throttle control and consistent performance across the RPM band. The MIKUNI Jet Needle J8-5L01 fine-tunes your carburetor's fuel mixture during the transition between idle and wide-open throttle,...5L1- SKU:
- 5L1
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- MODEL:
- J8-5L01
- RIDING STYLE:
- OFF-ROAD
$10.50 -
On Sale
MIKUNI Jet Needle J8-6DGY04-59
MIKUNI
MSRP: $10.50Now: $7.00Was: $10.50Fine-tuning your carburetor's mid-range fuel mixture requires precision—and the MIKUNI Jet Needle J8-6DGY04-59 delivers exactly that. If you're experiencing hesitation, bog, or inconsistent throttle response between idle and wide-open, a worn or...6DGY0459- SKU:
- 6DGY0459
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- MODEL:
- J8-6DGY04-59
- PRODUCT NAME:
- JET
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- TYPE:
- NEEDLE
MSRP: $10.50Now: $7.00Was: $10.50 -
MIKUNI Jet Needle J8-6DH02
MIKUNI
$10.50Precise mid-range fuel mixture control is essential for smooth power delivery and throttle response across your Mikuni carburetor's operating range. The MIKUNI Jet Needle J8-6DH02 directly influences how your engine transitions from idle to wide-open...6DH2- SKU:
- 6DH2
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- MODEL:
- J8-6DH02
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$10.50 -
MIKUNI Jet Needle J8-6DH03
MIKUNI
$10.50If your Mikuni carburettor isn't delivering the fuel mixture you need in the mid-range throttle zone, a worn or incorrect jet needle will rob you of throttle response and overall performance. The MIKUNI Jet Needle J8-6DH03 is engineered to restore...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
