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 Countershaft Sprocket - 12-Tooth 27511-29001
PARTS UNLIMITED
$10.15A worn or damaged countershaft sprocket compromises your entire drivetrain's efficiency and reliability. This OEM-spec 12-tooth sprocket restores precise engagement with your chain, ensuring consistent power delivery and eliminating the slack or noise...K222806- SKU:
- K222806
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- RAW
- RIDING STYLE:
- STREET
- TYPE:
- COUNTERSHAFT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TOOTH COUNT:
- 12
- PRODUCT NAME:
- SPROCKET
- UNITS:
- EACH
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- RIDING STYLE:
- OFF-ROAD
$10.15 -
PARTS UNLIMITED Countershaft Sprocket - 15-Tooth 27511-18710
PARTS UNLIMITED
$15.25A worn or damaged countershaft sprocket compromises your entire drivetrain's efficiency and can lead to costly secondary damage. This 15-tooth sprocket is manufactured to OEM specifications using hardened steel, ensuring precise engagement with your...K222809- SKU:
- K222809
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- COUNTERSHAFT
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- RAW
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- TOOTH COUNT:
- 15
- CHAIN SIZE:
- 525
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
$15.25Qty in Cart: 0Quantity:Price:$15.25Subtotal: -
PARTS UNLIMITED Countershaft Sprocket - 13-Tooth 27511-41700
PARTS UNLIMITED
$7.09A worn or damaged countershaft sprocket will compromise your entire drivetrain's efficiency and can lead to costly chain failure. This OEM-spec replacement ensures precise engagement with your chain while maintaining factory performance standards. Trust...K222825- SKU:
- K222825
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- COLOR/FINISH:
- RAW
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- CHAIN SIZE:
- 428
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- TOOTH COUNT:
- 13
- UNITS:
- EACH
$7.09 -
PARTS UNLIMITED Countershaft Sprocket - 14-Tooth 27511-41301
PARTS UNLIMITED
$7.09A worn or damaged countershaft sprocket directly impacts your bike's acceleration, power delivery, and overall drivetrain reliability. This OEM-spec replacement ensures you maintain the exact gear ratios and engagement characteristics your machine was...K222826- SKU:
- K222826
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- CHAIN SIZE:
- 428
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- COLOR/FINISH:
- RAW
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 14
$7.09 -
PARTS UNLIMITED Countershaft Sprocket - 13-Tooth 27511-41110
PARTS UNLIMITED
$13.21A worn or damaged countershaft sprocket directly compromises your engine's power delivery and transmission efficiency. This OEM-spec replacement restores precise gear engagement, eliminating slack and ensuring consistent acceleration across all RPM...K222833- SKU:
- K222833
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- RAW
- TYPE:
- COUNTERSHAFT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TOOTH COUNT:
- 13
- UNITS:
- EACH
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
$13.21 -
PARTS UNLIMITED Countershaft Sprocket - 14-Tooth 27511-48100
PARTS UNLIMITED
$7.09A worn or damaged countershaft sprocket directly compromises your bike's power delivery and acceleration consistency. This OEM-spec replacement restores precise engagement with your chain, eliminating slack and ensuring reliable performance whether...K222846- SKU:
- K222846
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 14
- COLOR/FINISH:
- RAW
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERSHAFT
- CHAIN SIZE:
- 428
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$7.09 -
PARTS UNLIMITED Countershaft Sprocket - 12-Tooth 27511-41500-12
PARTS UNLIMITED
$11.17A worn or damaged countershaft sprocket will compromise your bike's power delivery and acceleration response. This OEM-spec replacement restores precise engagement with your chain, ensuring consistent gear ratios and eliminating the slack or noise that...K222850- SKU:
- K222850
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- CHAIN SIZE:
- 520
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 12
- COLOR/FINISH:
- RAW
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERSHAFT
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
$11.17 -
PARTS UNLIMITED Countershaft Sprocket - 13-Tooth 27511-41500-13
PARTS UNLIMITED
$11.17A worn or damaged countershaft sprocket compromises your entire drivetrain's efficiency and reliability. This OEM-spec replacement restores precise chain engagement and power delivery without modification or fitment issues. Running a quality front...K222858- SKU:
- K222858
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TOOTH COUNT:
- 13
- UNITS:
- EACH
- COLOR/FINISH:
- RAW
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERSHAFT
- CHAIN SIZE:
- 520
- RIDING STYLE:
- STREET
$11.17 -
PARTS UNLIMITED Countershaft Sprocket - 14-Tooth 27511-02B00
PARTS UNLIMITED
$4.17A worn or damaged countershaft sprocket compromises power delivery and accelerates wear on your entire drivetrain. This OEM-specification 14-tooth sprocket restores precise engagement with your chain, ensuring consistent acceleration and reliable...K222861- SKU:
- K222861
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- CHAIN SIZE:
- 420
- MATERIAL:
- STEEL
- UNITS:
- EACH
- COLOR/FINISH:
- RAW
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERSHAFT
- TOOTH COUNT:
- 14
$4.17Qty in Cart: 0Quantity:Price:$4.17Subtotal: -
PARTS UNLIMITED Countershaft Sprocket - 13-Tooth 27511-14310
PARTS UNLIMITED
$14.23Your countershaft sprocket is the foundation of your drivetrain's efficiency and responsiveness. A worn or damaged sprocket degrades acceleration, creates chain slip, and accelerates wear across your entire transmission system. The PARTS UNLIMITED...K222866- SKU:
- K222866
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- COLOR/FINISH:
- RAW
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERSHAFT
- CHAIN SIZE:
- 520
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TOOTH COUNT:
- 13
- UNITS:
- EACH
$14.23Qty in Cart: 0Quantity:Price:$14.23Subtotal: -
PARTS UNLIMITED Rear Honda Sprocket - 428 - 48 Tooth 41201-KN4-000
PARTS UNLIMITED
$27.49A worn or damaged rear sprocket directly impacts your engine's power delivery and acceleration consistency—making this OEM-spec replacement essential for maintaining peak drivetrain performance. Whether you're running stock power or forced induction, a...K223504P- SKU:
- K223504P
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 48
- TYPE:
- DRIVE
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- NATURAL
- PRODUCT NAME:
- SPROCKET
- UNITS:
- EACH
- MOUNTING POSITION:
- REAR
$27.49 -
PARTS UNLIMITED Rear Honda Sprocket - 428 - 50 Tooth 41201-KN4-00050
PARTS UNLIMITED
$30.55A worn or damaged rear sprocket compromises your power delivery and creates inconsistent acceleration—exactly what you can't afford in racing or performance riding. This OEM-spec replacement restores precise engagement with your chain, eliminating slack...K223504Q- SKU:
- K223504Q
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- CHAIN SIZE:
- 428
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 50
- UNITS:
- EACH
- COLOR/FINISH:
- NATURAL
- MOUNTING POSITION:
- REAR
$30.55 -
PARTS UNLIMITED Rear Honda Sprocket - 428 - 52 Tooth 41201KN4000-52T
PARTS UNLIMITED
$32.59A worn or damaged rear sprocket compromises your entire drivetrain's efficiency and can lead to costly chain wear or transmission issues. This OEM-spec 52-tooth rear sprocket restores proper gear ratio and engagement, ensuring smooth power delivery and...K223504R- SKU:
- K223504R
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- COLOR/FINISH:
- NATURAL
- MOUNTING POSITION:
- REAR
- TOOTH COUNT:
- 52
- CHAIN SIZE:
- 428
- PRODUCT NAME:
- SPROCKET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- UNITS:
- EACH
$32.59 -
PARTS UNLIMITED Rear Honda Sprocket - 520 - 59 Tooth 41202-KS6-830SR
PARTS UNLIMITED
$44.83A worn or damaged rear sprocket compromises your entire drivetrain's efficiency, reducing acceleration and straining your clutch and chain. This OEM-specification replacement restores precise engagement and chain compatibility, ensuring reliable power...K223504U- SKU:
- K223504U
- Availability:
- Ships Same Business Day
- Weight:
- 2.69 LBS
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 49
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- NATURAL
- MOUNTING POSITION:
- REAR
- TYPE:
- DRIVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
$44.83 -
PARTS UNLIMITED Rear Honda Sprocket - 428 - 49 Tooth 41201942-000-49
PARTS UNLIMITED
$29.53A worn or damaged sprocket compromises your entire drivetrain's efficiency, leading to power loss, chain wear, and potential catastrophic failure. This OEM-specification rear sprocket restores precise power delivery and chain engagement, whether you're...K223513- SKU:
- K223513
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- CHAIN SIZE:
- 428
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- STEEL
- COLOR/FINISH:
- NATURAL
- MOUNTING POSITION:
- REAR
- TYPE:
- DRIVE
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 49
$29.53 -
PARTS UNLIMITED Rear Honda Sprocket - 428 - 45 Tooth 41201-459-670
PARTS UNLIMITED
$31.57A worn or damaged rear sprocket directly impacts your Honda's acceleration, top speed, and overall drivetrain efficiency. This OEM-specification 45-tooth rear sprocket restores precise chain engagement and eliminates the slack, noise, and power loss that...K223518- SKU:
- K223518
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- CHAIN SIZE:
- 428
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 45
- UNITS:
- EACH
- COLOR/FINISH:
- NATURAL
- MOUNTING POSITION:
- REAR
$31.57 -
PARTS UNLIMITED Rear Yamaha Sprocket - 520 - 40 Tooth 583-25440-10
PARTS UNLIMITED
$30.55A worn or damaged sprocket directly impacts chain engagement, acceleration response, and overall drivetrain efficiency on your Yamaha. This OEM-spec rear sprocket restores precise tooth geometry and spline fitment, ensuring reliable power delivery...K223660- SKU:
- K223660
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- PRODUCT NAME:
- SPROCKET
- COLOR/FINISH:
- BLACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 520
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- DRIVE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 40
- UNITS:
- EACH
$30.55 -
PARTS UNLIMITED Rear Kawasaki Sprocket - 420 - 50 Tooth 42041-1228
PARTS UNLIMITED
$29.53A worn or damaged rear sprocket directly impacts your Kawasaki's acceleration, top-end performance, and drivetrain efficiency. This OEM-spec replacement ensures you're running the exact same geometry and tolerances as your original equipment, restoring...K223701C- SKU:
- K223701C
- Availability:
- Ships Same Business Day
- Weight:
- 1.56 LBS
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 50
- TYPE:
- DRIVE
- RIDING STYLE:
- OFF-ROAD
- MOUNTING POSITION:
- REAR
- CHAIN SIZE:
- 420
- UNITS:
- EACH
$29.53Qty in Cart: 0Quantity:Price:$29.53Subtotal: -
PARTS UNLIMITED Rear Kawasaki Sprocket - 520 - 48 Tooth 42041-1103
PARTS UNLIMITED
$43.81A worn or damaged sprocket compromises chain engagement and accelerates wear across your entire drivetrain—leading to power loss, noise, and premature failure. This PARTS UNLIMITED rear sprocket is manufactured to OEM specifications using hardened steel,...K223701F- SKU:
- K223701F
- Availability:
- Ships Same Business Day
- Weight:
- 2.38 LBS
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- CHAIN SIZE:
- 520
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- DRIVE
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 48
- UNITS:
- EACH
$43.81Qty in Cart: 0Quantity:Price:$43.81Subtotal: -
PARTS UNLIMITED Rear Kawasaki Sprocket - 520 - 50 Tooth 42041-1093
PARTS UNLIMITED
$45.85A worn or damaged rear sprocket directly compromises drivetrain efficiency, acceleration response, and overall ride safety. This OEM-specification Kawasaki rear sprocket restores precise chain engagement and power delivery, whether you're replacing worn...K223701G- SKU:
- K223701G
- Availability:
- Ships Same Business Day
- Weight:
- 2.31 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- CHAIN SIZE:
- 520
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 50
- UNITS:
- EACH
- MOUNTING POSITION:
- REAR
$45.85
