Dirt Bike Drivetrain
Dirt Bike Drivetrain Parts at JJ Motorsports
Enhance your dirt bike’s power transfer with premium drivetrain parts from JJ Motorsports. Find heavy-duty chains, front and rear sprockets, and clutch components designed to withstand intense riding demands. Combine these with other motocross gear and parts to maximize acceleration and ride efficiency on the track or trail.
Shop trusted brands like JT Chains for sealed chains and Renthal for ultralight sprockets. Explore related categories such as Dirt Bike Engine Parts for power upgrades or Dirt Bike Exhaust for complete tuning.
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
-
PARTS UNLIMITED Rear Kawasaki Sprocket - 520 - 44 Tooth 42041-1191
PARTS UNLIMITED
$34.63A worn or damaged sprocket directly impacts your drivetrain's efficiency, acceleration, and overall power delivery to the rear wheel. This OEM-spec rear sprocket restores factory performance and ensures reliable engagement with your chain, eliminating...K223701K- SKU:
- K223701K
- Availability:
- Ships Same Business Day
- Weight:
- 1.94 LBS
- MOUNTING POSITION:
- REAR
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 44
- UNITS:
- EACH
- CHAIN SIZE:
- 520
- RIDING STYLE:
- STREET
- TYPE:
- DRIVE
$34.63Qty in Cart: 0Quantity:Price:$34.63Subtotal: -
PARTS UNLIMITED Rear Kawasaki Sprocket - 520 - 45 Tooth CT217-45S
PARTS UNLIMITED
$40.75A worn or damaged rear sprocket kills acceleration, creates drivetrain noise, and accelerates wear on your chain and front sprocket. The PARTS UNLIMITED 45-tooth rear sprocket restores OEM-spec performance with precision-machined teeth and hardened steel...K223702G- SKU:
- K223702G
- Availability:
- Ships Same Business Day
- Weight:
- 2.19 LBS
- CHAIN SIZE:
- 520
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- NATURAL
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 45
- UNITS:
- EACH
- MATERIAL:
- STEEL
- TYPE:
- DRIVE
$40.75 -
PARTS UNLIMITED Rear Kawasaki Sprocket - 428 - 50 Tooth 42041-146
PARTS UNLIMITED
$27.49A worn or damaged rear sprocket compromises power delivery and accelerates wear on your chain and transmission. This OEM-spec replacement restores precise engagement and reliable performance, whether you're on the track or the trail. With hardened steel...K223724- SKU:
- K223724
- Availability:
- Ships Same Business Day
- Weight:
- 2.38 LBS
- CHAIN SIZE:
- 428
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- COLOR/FINISH:
- NATURAL
- MOUNTING POSITION:
- REAR
- TYPE:
- DRIVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 50
$27.49Qty in Cart: 0Quantity:Price:$27.49Subtotal: -
PARTS UNLIMITED Countershaft Sprocket - 14-Tooth 93823-14149-14T
PARTS UNLIMITED
$11.17A worn or damaged countershaft sprocket will compromise your entire drivetrain's efficiency and acceleration response. This OEM-spec 14-tooth sprocket restores precise engagement with your chain, eliminating slack and ensuring consistent power delivery...12120365- SKU:
- 12120365
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- EACH
- MATERIAL:
- STEEL
- TOOTH COUNT:
- 14
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- RAW
- RIDING STYLE:
- STREET
- TYPE:
- COUNTERSHAFT
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
$11.17Qty in Cart: 0Quantity:Price:$11.17Subtotal: -
PARTS UNLIMITED Countershaft Sprocket - 12-Tooth 23801-KSR-A0012
PARTS UNLIMITED
$11.17A worn or damaged countershaft sprocket compromises power transfer and introduces noise and vibration into your drivetrain. This OEM-specification replacement restores precise engagement with your chain while eliminating slop and ensuring consistent...12120396- SKU:
- 12120396
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 12
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- RAW
- TYPE:
- COUNTERSHAFT
$11.17 -
PARTS UNLIMITED Countershaft Sprocket - 13-Tooth 23801-KSR-A0013
PARTS UNLIMITED
$12.19A worn or damaged countershaft sprocket compromises your bike's power delivery and can lead to costly chain and transmission damage. The PARTS UNLIMITED 13-Tooth Countershaft Sprocket restores OEM-exact performance and reliability with precision-hardened...12120397- SKU:
- 12120397
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 13
- UNITS:
- EACH
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- RAW
- TYPE:
- COUNTERSHAFT
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- RIDING STYLE:
- OFF-ROAD
$12.19 -
PARTS UNLIMITED Countershaft Sprocket - 14-Tooth 23801-KSR-A0014
PARTS UNLIMITED
$14.23A worn or damaged countershaft sprocket directly impacts your bike's acceleration response and overall drivetrain efficiency. This OEM-spec replacement ensures you're running the exact same precision-engineered component your motorcycle was designed...12120398- SKU:
- 12120398
- Availability:
- Ships Same Business Day
- Weight:
- 0.29 LBS
- COLOR/FINISH:
- RAW
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 14
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- CHAIN SIZE:
- 520
- TYPE:
- COUNTERSHAFT
- UNITS:
- EACH
$14.23 -
PARTS UNLIMITED Countershaft Sprocket - 13-Tooth 2JW-17461-30
PARTS UNLIMITED
$7.09A worn or damaged countershaft sprocket compromises power delivery and accelerates wear on your entire drivetrain. This OEM-equivalent sprocket restores precise engagement with your chain while eliminating slack and vibration. Choose the exact...12120146- SKU:
- 12120146
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 13
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- RAW
- TYPE:
- COUNTERSHAFT
$7.09Qty in Cart: 0Quantity:Price:$7.09Subtotal: -
PARTS UNLIMITED Countershaft Sprocket - 12-Tooth 13144-0006-12
PARTS UNLIMITED
$8.11A worn or damaged countershaft sprocket will destroy your bike's acceleration and shift feel. This OEM-spec replacement restores precise power delivery and eliminates slack in your drivetrain. Whether you're rebuilding after a hard season or upgrading...12120147- SKU:
- 12120147
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- RAW
- TYPE:
- COUNTERSHAFT
- PRODUCT NAME:
- SPROCKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 12
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
$8.11 -
PARTS UNLIMITED Countershaft Sprocket - 13-Tooth 13144-0001-13
PARTS UNLIMITED
$9.13A worn or damaged countershaft sprocket directly compromises your drivetrain's efficiency and can lead to costly chain failure. This OEM-spec 13-tooth sprocket restores precise engagement with your chain, ensuring consistent power delivery and maximizing...12120148- SKU:
- 12120148
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 13
- TYPE:
- COUNTERSHAFT
- UNITS:
- EACH
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- RAW
$9.13 -
PARTS UNLIMITED Countershaft Sprocket - 13-Tooth 9382A-14227-13
PARTS UNLIMITED
$6.07A worn or damaged countershaft sprocket compromises power delivery and creates dangerous drivetrain slack. This PARTS UNLIMITED 13-tooth sprocket restores OEM-specification performance with precision-machined teeth and splines that engage cleanly with...12120149- SKU:
- 12120149
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- RAW
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- TYPE:
- COUNTERSHAFT
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 13
- UNITS:
- EACH
$6.07Qty in Cart: 0Quantity:Price:$6.07Subtotal: -
PARTS UNLIMITED Countershaft Sprocket - 14-Tooth 9382A-14227-14
PARTS UNLIMITED
$8.11Your countershaft sprocket is a critical wear item that directly impacts power delivery and drivetrain efficiency. A worn or damaged sprocket compromises tooth engagement, leading to chain slippage, accelerated wear on your chain and rear sprocket, and...12120150- SKU:
- 12120150
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 14
- UNITS:
- EACH
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- RAW
- TYPE:
- COUNTERSHAFT
$8.11 -
PARTS UNLIMITED Countershaft Sprocket - 13-Tooth 9383B-13218-13
PARTS UNLIMITED
$12.19A worn or damaged countershaft sprocket directly compromises your transmission's efficiency and power delivery to the rear wheel. This OEM-spec replacement ensures precise engagement with your chain, restoring optimal performance and eliminating the risk...12120151- SKU:
- 12120151
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- RAW
- TYPE:
- COUNTERSHAFT
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 13
- UNITS:
- EACH
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
$12.19 -
PARTS UNLIMITED 520 - Drive Chain - 120 Links T520120
PARTS UNLIMITED
$32.95A 520 chain is a proven workhorse in motorsports and powersports applications, delivering reliable power transfer with minimal maintenance. The Parts Unlimited 520-120 comes precut and ready to install, eliminating the hassle of measuring and cutting...T520120- SKU:
- T520120
- Availability:
- Ships Same Business Day
- Weight:
- 3.88 LBS
- RIDING STYLE:
- OFF-ROAD
- SEAL TYPE:
- NON-SEAL
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- BLACK
- MASTER LINK CONNECTOR:
- CLIP
- MAXIMUM ENGINE DISPLACEMENT (OFFROAD):
- 250 CC
- NUMBER OF LINKS:
- 120
- PRODUCT NAME:
- DRIVE CHAIN
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TENSILE STRENGTH METRIC:
- 29.3 KN
- UNITS:
- EACH
- MATERIAL:
- STEEL
- MAXIMUM ENGINE DISPLACEMENT (STREET):
- 250 CC
- RIDING STYLE:
- UTV
- TENSILE STRENGTH IMPERIAL:
- 6600 LB
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
PARTS UNLIMITED 428 - Drive Chain - 120 Links T428120
PARTS UNLIMITED
$20.95The PARTS UNLIMITED 428 Drive Chain delivers reliable performance across a wide range of applications without requiring custom sizing or fabrication. Whether you're building a go-kart, mini bike, or small-displacement engine, this precut 120-link chain...T428120- SKU:
- T428120
- Availability:
- Ships Same Business Day
- Weight:
- 2.38 LBS
- CHAIN SIZE:
- 428
- NUMBER OF LINKS:
- 120
- PRODUCT NAME:
- DRIVE CHAIN
- UNITS:
- EACH
- MAXIMUM ENGINE DISPLACEMENT (OFFROAD):
- 125 CC
- RIDING STYLE:
- ATV
- TENSILE STRENGTH METRIC:
- 18 KN
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TENSILE STRENGTH IMPERIAL:
- 4050 LB
- COLOR/FINISH:
- BLACK
- MASTER LINK CONNECTOR:
- CLIP
- MAXIMUM ENGINE DISPLACEMENT (STREET):
- 125 CC
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- SEAL TYPE:
- NON-SEAL
$20.95Qty in Cart: 0Quantity:Price:$20.95Subtotal: -
PARTS UNLIMITED Countershaft Sprocket - 15-Tooth 23800-053-000
PARTS UNLIMITED
$63.19A worn or damaged countershaft sprocket directly impacts your bike's acceleration, power delivery, and overall drivetrain efficiency. This OEM-spec replacement ensures your front sprocket matches factory tolerances exactly, eliminating the risk of chain...K222503H- SKU:
- K222503H
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- RAW
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERSHAFT
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 15
$63.19 -
PARTS UNLIMITED Countershaft Sprocket - 17-Tooth 23801344-000-17
PARTS UNLIMITED
$21.37A worn or damaged countershaft sprocket directly impacts your power delivery and chain engagement—compromising acceleration and creating safety risks. The PARTS UNLIMITED 17-tooth countershaft sprocket restores OEM-spec performance with...K222526- SKU:
- K222526
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- CHAIN SIZE:
- 530
- COLOR/FINISH:
- RAW
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 17
- TYPE:
- COUNTERSHAFT
$21.37 -
PARTS UNLIMITED Rear Yamaha Sprocket - 520 - 47 Tooth 214-25447-10
PARTS UNLIMITED
$42.79A worn or damaged rear sprocket compromises your chain drive efficiency, accelerates component wear, and can leave you stranded mid-ride. The PARTS UNLIMITED Rear Yamaha Sprocket delivers OEM-specification performance with precision-machined teeth and...K223623- SKU:
- K223623
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- UNITS:
- EACH
- CHAIN SIZE:
- 520
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- TYPE:
- DRIVE
- COLOR/FINISH:
- BLACK
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 47
$42.79 -
PARTS UNLIMITED Rear Kawasaki Sprocket - 520 - 43 Tooth 42041-1260
PARTS UNLIMITED
$41.77A worn or damaged sprocket compromises your chain drive's efficiency and can leave you stranded mid-ride. This OEM-spec rear sprocket restores precise engagement between your chain and wheel, ensuring reliable power delivery and extending drivetrain life...K223702B- SKU:
- K223702B
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- COLOR/FINISH:
- NATURAL
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- MATERIAL:
- STEEL
- UNITS:
- EACH
- CHAIN SIZE:
- 520
- TOOTH COUNT:
- 43
- TYPE:
- DRIVE
- RIDING STYLE:
- STREET
$41.77 -
PARTS UNLIMITED Rear Honda Sprocket - 420 - 37 Tooth 41201-GW8-670
PARTS UNLIMITED
$17.29A worn or damaged rear sprocket directly impacts your chain engagement and overall drivetrain efficiency, leading to power loss and accelerated wear on your entire transmission system. This OEM-spec replacement restores precise tooth geometry and spline...K223901- SKU:
- K223901
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- CHAIN SIZE:
- 420
- COLOR/FINISH:
- NATURAL
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 37
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- TYPE:
- DRIVE
$17.29Qty in Cart: 0Quantity:Price:$17.29Subtotal:
