Dirt Bike Air and Fuel
Dirt Bike Air & Fuel Systems at JJ Motorsports
Optimize your bike’s performance with high-quality air and fuel components from JJ Motorsports. Browse air filters, carburetors, and fuel system parts engineered to deliver clean airflow and a consistent fuel mix for peak efficiency. Ensure your bike runs smoothly by pairing these with other essential off-road dirt bike accessories.
Shop trusted brands like Motion Pro for cables and Uni Filter for high-flow filters. Explore related categories such as Dirt Bike Engine Parts for rebuilds or Dirt Bike Exhaust for complete tuning.
Top Dirt Bike Air & Fuel Products
- MOTION PRO Clutch Cable - Honda - Black Vinyl 02-0603 – Nylon-lined for smooth operation and OEM fit.
- UNI FILTER Filter - GS550/650 Miscellaneous NU-2439 – High-flow foam for better air intake and easy cleaning.
- MIKUNI Main Jet - 4-Pack N100604-1025 – Precision jets for VM16, HS40, HSR42/45/48 carbs.
- DYNOJET Power Vision 3 - Yamaha PV3-22-16 – Flash tunes with real-time data display for Yamaha models.
- UNI FILTER Filter - GS650G/GL/M NU-2440 – Precision fit with indefinite service life for Suzuki GS models.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
MIKUNI Needle Valve Arm Spring - 115 grams 730-03027
MIKUNI
$2.84The MIKUNI Needle Valve Arm Spring is a precision replacement component engineered for carburetors that demand reliable fuel metering across varying engine speeds and loads. If your MIKUNI carb is running rich, surging, or exhibiting inconsistent idle...73003027- SKU:
- 73003027
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- SPRING RATE METRIC:
- 115.00 G
- TYPE:
- NEEDLE VALVE
- UNITS:
- EACH
- PRODUCT NAME:
- SPRING
- RIDING STYLE:
- WATERCRAFT
$2.84 -
BOYESEN Racing Reeds - KX250 692
BOYESEN
$39.95Boyesen dual-stage reeds are engineered to maximize intake flow velocity across your entire powerband, delivering measurable gains from cold start through peak acceleration. Laboratory flow analysis confirms these reeds substantially outperform OEM...692- SKU:
- 692
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- MODEL:
- POWER REED
- TYPE:
- DUAL STAGE
- UNITS:
- SET
- PRODUCT NAME:
- REED PETAL
- RIDING STYLE:
- OFF-ROAD
$39.95 -
BOYESEN Racing Reeds - KX125 691
BOYESEN
$39.95Boyesen racing reeds are engineered to maximize your KX125's intake efficiency across the entire RPM band. Laboratory flow analysis demonstrates that dual-stage reed design delivers superior velocity and responsiveness compared to OEM reeds, translating...691- SKU:
- 691
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REED PETAL
- UNITS:
- SET
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- MODEL:
- POWER REED
- TYPE:
- DUAL STAGE
- RIDING STYLE:
- OFF-ROAD
$39.95 -
BOYESEN Reed - TM/Honda 690
BOYESEN
$39.95Stock reeds limit your engine's breathing potential, restricting flow velocity across critical RPM ranges and costing you performance from cold start through peak acceleration. Boyesen's dual-stage reed design eliminates this bottleneck through...690- SKU:
- 690
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- REED PETAL
- UNITS:
- SET
- MODEL:
- POWER REED
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- TYPE:
- DUAL STAGE
$39.95 -
BOYESEN Reed - YZ250 '99-'00 689
BOYESEN
$39.95Stock reed valves restrict flow and limit your YZ250's potential across the entire RPM range. Boyesen's dual-stage reed design has been lab-proven to deliver higher flow velocity at all operating pressures, translating to sharper throttle response off...689- SKU:
- 689
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- POWER REED
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- PRODUCT NAME:
- REED PETAL
- TYPE:
- DUAL STAGE
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
BOYESEN Reed - KX250 '99 688
BOYESEN
$39.95The stock reed valve is your two-stroke's bottleneck. Boyesen's dual-stage reed design eliminates that restriction, delivering measurably higher flow velocity across your entire power band—from crisp throttle response at low RPM to sustained acceleration...688- SKU:
- 688
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- POWER REED
- UNITS:
- SET
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- PRODUCT NAME:
- REED PETAL
- TYPE:
- DUAL STAGE
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
BOYESEN Reed - KTM250/380 686
BOYESEN
$39.95Stock reed valves are the silent bottleneck in your KTM's intake system—they restrict flow and cost you power at every RPM. The Boyesen dual-stage reed design eliminates this limitation by maintaining optimal valve timing across your entire operating...686- SKU:
- 686
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- FIBERGLASS
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- POWER REED
- RIDING STYLE:
- ATV
- UNITS:
- SET
- BASE COLOR:
- YELLOW
- PRODUCT NAME:
- REED PETAL
- TYPE:
- DUAL STAGE
$39.95 -
BOYESEN Reed - CR250 '99-'00 684
BOYESEN
$39.95If you're running a CR250 and leaving performance on the table, your reed valve design is likely the culprit. Boyesen's dual-stage reed technology has been laboratory-proven to deliver superior flow characteristics across your entire power band,...684- SKU:
- 684
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- MODEL:
- POWER REED
- TYPE:
- DUAL STAGE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REED PETAL
- UNITS:
- SET
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
BOYESEN Racing Reed - RM250 '98-'00 681
BOYESEN
$39.95Stock reeds limit your RM250's potential across the entire power band—from initial throttle response to peak acceleration. Boyesen's dual-stage reed design has been lab-proven to deliver superior flow velocity at all operating pressures, translating to...681- SKU:
- 681
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- PRODUCT NAME:
- REED PETAL
- TYPE:
- DUAL STAGE
- MODEL:
- POWER REED
- UNITS:
- SET
$39.95 -
BOYESEN Racing Reed - Yamaha 679
BOYESEN
$39.95The Boyesen Racing Reed for Yamaha 679 delivers measurable performance gains across your entire powerband, from low-end responsiveness to peak acceleration. Laboratory flow analysis confirms that Boyesen's dual-stage reed design permits greater flow...679R- SKU:
- 679R
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- FIBERGLASS
- TYPE:
- DUAL STAGE
- BASE COLOR:
- YELLOW
- UNITS:
- SET
- PRODUCT NAME:
- REED PETAL
- MODEL:
- POWER REED
- RIDING STYLE:
- OFF-ROAD
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
BOYESEN Racing Reeds - KTM50 678
BOYESEN
$34.95Stock reed valves limit your KTM50's potential across the entire RPM range. Boyesen's dual-stage reed design has been laboratory-validated to deliver superior flow velocity and responsiveness, translating to measurable gains from cold starts through peak...678X- SKU:
- 678X
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MODEL:
- POWER REED
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DUAL STAGE
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- PRODUCT NAME:
- REED PETAL
- UNITS:
- SET
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
BOYESEN Racing Reed - Honda 664
BOYESEN
$39.95The Boyesen Racing Reed for Honda 664 engines delivers measurable flow improvements across your entire operating range, directly translating to faster throttle response and stronger acceleration. Laboratory flow analysis confirms that Boyesen's...664- SKU:
- 664
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MODEL:
- POWER REED
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- PRODUCT NAME:
- REED PETAL
- TYPE:
- DUAL STAGE
$39.95 -
BOYESEN Racing Reed - Husqvarna 662
BOYESEN
$48.95Stock reed valves are a limiting factor in two-stroke performance, restricting flow velocity across your power band and leaving power on the table. The Boyesen Racing Reed for Husqvarna 662 leverages laboratory-proven dual-stage technology to deliver...662- SKU:
- 662
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- MODEL:
- POWER REED
- TYPE:
- DUAL STAGE
- UNITS:
- SET
- PRODUCT NAME:
- REED PETAL
- RIDING STYLE:
- OFF-ROAD
$48.95 -
BOYESEN Racing Reed - YZ80 '93-'01 648
BOYESEN
$34.95The Boyesen Racing Reed transforms your YZ80's intake flow dynamics by optimizing pressure velocity across the entire RPM band. Laboratory-tested dual-stage reed design delivers measurable gains in throttle response and mid-range acceleration. If you're...648R- SKU:
- 648R
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MODEL:
- POWER REED
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- PRODUCT NAME:
- REED PETAL
- TYPE:
- DUAL STAGE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
$34.95 -
BOYESEN Racing Reed - Suzuki RM/X250 647
BOYESEN
$39.95Stock reeds limit your RM/X250's potential across the entire power band—from bottom-end response to peak acceleration. The Boyesen Racing Reed leverages dual-stage reed technology validated through laboratory flow analysis to deliver measurably higher...647R- SKU:
- 647R
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- REED PETAL
- UNITS:
- SET
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- TYPE:
- DUAL STAGE
- MODEL:
- POWER REED
- RIDING STYLE:
- OFF-ROAD
$39.95 -
BOYESEN Reed Kawasaki/Yamaha 646
BOYESEN
$34.95Stock reed valves limit your engine's breathing potential across the entire RPM range, leaving performance on the table from idle to redline. The Boyesen dual-stage reed design increases flow velocity under all operating pressures, delivering measurable...646- SKU:
- 646
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- MODEL:
- POWER REED
- TYPE:
- DUAL STAGE
- UNITS:
- SET
- PRODUCT NAME:
- REED PETAL
- RIDING STYLE:
- OFF-ROAD
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
BOYESEN Racing Reed - Yamaha 644
BOYESEN
$39.95Reed valves are the circulatory system of your two-stroke engine—they control intake timing and flow to generate power. The Boyesen Racing Reed for Yamaha 644 uses laboratory-proven dual-stage geometry that accelerates intake velocity across the entire...644R- SKU:
- 644R
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- FIBERGLASS
- PRODUCT NAME:
- REED PETAL
- BASE COLOR:
- YELLOW
- MODEL:
- POWER REED
- TYPE:
- DUAL STAGE
- UNITS:
- SET
$39.95 -
BOYESEN Racing Reed - Suzuki 643
BOYESEN
$39.95Your engine's reed valve is the gatekeeper of performance—restrict flow, and you're leaving horsepower on the table. Boyesen's dual-stage racing reed design has been laboratory-validated to deliver superior flow velocity across your entire powerband,...643R- SKU:
- 643R
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- REED PETAL
- UNITS:
- SET
- MODEL:
- POWER REED
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- TYPE:
- DUAL STAGE
$39.95 -
BOYESEN Racing Reeds - Suzuki/Yamaha 642
BOYESEN
$39.95Boyesen racing reeds are engineered to deliver measurable flow improvements across your entire power band—from initial throttle response to peak acceleration. Laboratory flow analysis confirms that Boyesen's dual-stage reed design permits greater flow...642- SKU:
- 642
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- PRODUCT NAME:
- REED PETAL
- TYPE:
- DUAL STAGE
- UNITS:
- SET
- MODEL:
- POWER REED
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
BOYESEN Racing Reed - Yamaha 640
BOYESEN
$39.95Your Yamaha 640's intake efficiency directly impacts power delivery across the entire RPM range. Boyesen's dual-stage reed design increases flow velocity and pressure consistency, translating to sharper throttle response and stronger acceleration from...640R- SKU:
- 640R
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- SET
- BASE COLOR:
- YELLOW
- MATERIAL:
- FIBERGLASS
- PRODUCT NAME:
- REED PETAL
- TYPE:
- DUAL STAGE
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- POWER REED
$39.95
