Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
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
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Wiseco Yamaha YZ450F 2014-2017 Piston Kit with Gasket PK1900
WISECO
$289.95The Wiseco PK1900 piston kit restores lost compression and combustion efficiency in high-mileage YZ450F engines, delivering measurable gains in throttle response and power delivery. Whether you're rebuilding after a top-end failure or upgrading for race...09031144- SKU:
- 09031144
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- BORE SIZE METRIC:
- 97.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 96.95 MM
- DISPLACEMENT:
- 449 CC
- SKIRT COATING:
- ARMORGLIDE®
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 60.80 MM
- UNITS:
- KIT
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
Wiseco 43.00mm Piston Ring Set for Kawasaki KDX50 2003-2006 1693CD
WISECO
$52.95If you're rebuilding a KDX50 engine or restoring compression after high hours, worn piston rings are a primary culprit for power loss and increased blow-by. The Wiseco 1693CD ring set delivers precision-engineered sealing that restores cylinder...1693CD- SKU:
- 1693CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- DISPLACEMENT:
- 49 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 60 CC
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 43.00 MM
- UNITS:
- SET
$52.95 -
Wiseco 41mm Piston Ring Set for Kawasaki KDX50 2003-2006 1614CD
WISECO
$52.95Piston ring degradation is one of the fastest ways to lose compression and power in a KDX50—and Wiseco's 41mm ring set is engineered to restore sealed combustion and maintain consistent performance across your engine's RPM range. Whether you're...1614CD- SKU:
- 1614CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- ATV
- DISPLACEMENT:
- 49 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 41.00 MM
- UNITS:
- SET
$52.95 -
Wiseco Circlip 12mm for Honda CR80R 1980-1984 CW12
WISECO
$2.99If you're rebuilding a Honda CR80R engine, piston circlips are critical—they keep your piston pin secure and prevent catastrophic engine failure. Wiseco's CW12 circlips are forged from high-silicon alloy, delivering the strength needed to handle the...CW12- SKU:
- CW12
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- PRODUCT NAME:
- CIRCLIP
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- OUTSIDE DIAMETER:
- 12,00 MM
- OUTSIDE DIAMETER METRIC:
- 12.00 MM
$2.99 -
Wiseco Circlip 13mm Honda CRF50F 2004-2025 CW13
WISECO
$2.99The piston circlip is a critical retention component that keeps your piston pin secure under high RPM and combustion pressure. A quality circlip prevents catastrophic engine failure from pin drop-out, especially in high-revving small-displacement engines...CW13- SKU:
- CW13
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 13 MM
- OUTSIDE DIAMETER METRIC:
- 13 MM
- PRODUCT NAME:
- CIRCLIP
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- PAIR
$2.99 -
Wiseco Circlip CW14 for Honda CR125R 1979-1987
WISECO
$2.99Piston circlips are a critical wear item in two-stroke engines—they secure the wrist pin and directly affect engine reliability under high RPM loads. The Wiseco CW14 is engineered from a high-silicon alloy to deliver the strength and precision fit needed...CW14- SKU:
- CW14
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER:
- 14 MM
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 14 MM
- PRODUCT NAME:
- CIRCLIP
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- PAIR
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$2.99 -
Wiseco Circlip 15mm Honda CR125R 1988-2007 CW15
WISECO
$2.99Piston circlips are a critical wear item in high-revving two-stroke engines, and a failed clip can cause catastrophic piston damage. The Wiseco CW15 is engineered to maintain consistent ring tension and prevent piston pin rocking across the entire RPM...CW15- SKU:
- CW15
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 15 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- PAIR
- OUTSIDE DIAMETER METRIC:
- 15 MM
- PRODUCT NAME:
- CIRCLIP
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$2.99 -
Wiseco Top End Bearing Kawasaki 1100ZXi 1996-2003 B1030
WISECO
$25.95The Wiseco Top End Bearing B1030 is engineered to handle sustained high-RPM operation without compromising reliability—critical for engines pushed to their limits. Whether you're racing or building a high-performance recreational engine, this bearing...B1030- SKU:
- B1030
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- BEARING
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 27 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 22 MM
- LENGTH METRIC:
- 24.8 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- WATERCRAFT
$25.95 -
Wiseco Top End Bearing 20x25x22.8mm for 2003-2004 Polaris 700 Classic B1031
WISECO
$25.95If you're running your 2003-2004 Polaris 700 Classic at sustained high RPMs, factory bearings wear quickly under extreme conditions. The Wiseco B1031 top end bearing delivers the durability and precision you need to maintain consistent performance and...B1031- SKU:
- B1031
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- SNOW
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 25 MM
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 20 MM
- LENGTH METRIC:
- 23 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- APPLICATION:
- PISTON
$25.95 -
Wiseco Top End Bearing 18x22x19.8mm for KTM 250 SX 1992-2024 B1037
WISECO
$25.95Top-end bearings are critical wear items in high-RPM two-stroke engines, and OEM replacements often lack the durability needed for sustained racing or aggressive trail riding. The Wiseco B1037 delivers superior longevity through precision engineering and...B1037- SKU:
- B1037
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 22 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 18 MM
- MATERIAL:
- SILICONE
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 19.8 MM
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
Wiseco Top End Bearing Yamaha YZ125 1997-2000 B1038
WISECO
$25.95The Wiseco B1038 top end bearing is engineered to handle the demanding conditions of high-RPM two-stroke racing. Factory OEM bearings wear quickly under sustained performance use, leading to increased friction, heat buildup, and potential engine failure...B1038- SKU:
- B1038
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- INSIDE DIAMETER METRIC:
- 15 MM
- MATERIAL:
- ALUMINUM
- TYPE:
- TOP END
- UNITS:
- EACH
- OUTSIDE DIAMETER METRIC:
- 20 MM
- PRODUCT NAME:
- BEARING
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 17.8 MM
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
Wiseco Top End Bearing KTM 50 SX 2007-2022 B1041
WISECO
$25.95The Wiseco Top End Bearing B1041 is engineered for KTM 50 SX models to deliver reliable performance where it matters most—inside your engine. Whether you're rebuilding after a season of intense riding or upgrading to factory-level components, this...B1041- SKU:
- B1041
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- BEARING
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 12 MM
- LENGTH METRIC:
- 14.5 MM
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- OUTSIDE DIAMETER METRIC:
- 15 MM
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
Wiseco Top End Bearing for KTM 65 SX 2000-2021 B1042
WISECO
$25.95The top end bearing is critical to your KTM 65 SX's reliability under sustained high RPM operation. A worn or substandard bearing introduces friction, accelerates wear on adjacent components, and compromises the smooth power delivery your engine needs on...B1042- SKU:
- B1042
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- INSIDE DIAMETER METRIC:
- 12 MM
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- BEARING
- LENGTH METRIC:
- 16.3 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER METRIC:
- 15 MM
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
Wiseco Cam Chain Kawasaki KX450F 2009-2018 CC022
WISECO
$104.95A worn or stretched cam chain robs your KX450F of crisp throttle response and can lead to costly engine damage if left unchecked. The Wiseco CC022 is engineered to eliminate slack, reduce parasitic friction losses, and keep your valve timing...09250716- SKU:
- 09250716
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
- CHAIN SIZE:
- 98XRH2010
- PRODUCT NAME:
- CHAIN
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- NUMBER OF LINKS:
- 122
- UNITS:
- EACH
$104.95Qty in Cart: 0Quantity:Price:$104.95Subtotal: -
Wiseco Cam Chain for Honda CRF450R 2009-2016 CC023
WISECO
$118.95A worn or marginal cam chain can compromise valve timing precision and lead to catastrophic engine damage—especially on high-revving engines like the CRF450R. The Wiseco CC023 replaces your OEM chain with a premium upgrade that runs tighter tolerances,...09250717- SKU:
- 09250717
- Availability:
- Ships Same Business Day
- Weight:
- 0.52 LBS
- CHAIN SIZE:
- 96RH2015
- NUMBER OF LINKS:
- 108
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- PRODUCT NAME:
- CHAIN
- UNITS:
- EACH
$118.95 -
Wiseco Cam Chain Honda CRF250R 2010-2017 CC024
WISECO
$87.95The cam chain is critical to your CRF250R's reliability—excessive wear or stretch compromises valve timing and can lead to catastrophic engine damage. Wiseco's CC024 replacement chain restores proper valve actuation while reducing friction and wear...09250718- SKU:
- 09250718
- Availability:
- Ships Same Business Day
- Weight:
- 0.48 LBS
- CHAIN SIZE:
- 92RH2015
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- NUMBER OF LINKS:
- 106
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
$87.95Qty in Cart: 0Quantity:Price:$87.95Subtotal: -
Wiseco Cam Chain Honda CRF250R 2004-2009 CC001
WISECO
$87.95A worn or stretched cam chain compromises valve timing precision, leading to power loss and potential engine damage. The Wiseco CC001 delivers the durability and tight tolerances your CRF250R demands, ensuring consistent performance lap after lap. This...09250301- SKU:
- 09250301
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
- UNITS:
- EACH
- CHAIN SIZE:
- 92RH2015
- PRODUCT NAME:
- CHAIN
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- NUMBER OF LINKS:
- 104
- RIDING STYLE:
- STREET
$87.95 -
Wiseco Cam Chain for Honda CRF450R 2002-2008 CRF450X 2005-2009 TRX450R 2006-2009 TRX450ER 2006-2009 Husqvarna FE501 2017-2019 KTM 500 EXC-F 2017-2019 CC002
WISECO
$87.95A worn or weak cam chain compromises valve timing and engine reliability, leading to poor performance and costly internal damage. The Wiseco CC002 delivers the precision engineering and durability your engine demands, whether you're pushing peak RPMs on...09250302- SKU:
- 09250302
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- CHAIN
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- RIDING STYLE:
- ATV
- CHAIN SIZE:
- 92RH2015
- NUMBER OF LINKS:
- 112
- RIDING STYLE:
- STREET
$87.95 -
Wiseco 78mm Piston Ring Set for Honda XR250R 1988-2004 3071XC
WISECO
$52.95OEM Honda rings often wear quickly under aggressive riding, causing power loss and increased blow-by that compromises engine efficiency. The Wiseco 3071XC piston ring set restores compression seal and combustion efficiency through precision engineering,...09120119- SKU:
- 09120119
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- BORE SIZE METRIC:
- 78.00 MM
- DISPLACEMENT:
- 250 CC
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
$52.95 -
Wiseco 78.00mm Piston Ring Set for 2013-2022 KTM 250 SX-F 7800YB
WISECO
$57.95If you're rebuilding a 250 SX-F top end or refreshing your piston after high-mileage use, ring blow-by kills combustion efficiency and wastes horsepower. Wiseco's 7800YB ring set is engineered to seal tight against the cylinder wall, maintaining...09120120- SKU:
- 09120120
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 78.00 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- DISPLACEMENT:
- 249 CC
- UNITS:
- SET
$57.95
