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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WSM Motor Mount - XL1200 011-125
WSM
$56.48Worn-out motor mounts allow excessive engine movement, degrading handling precision and accelerating wear on drivetrain components. The WSM Motor Mount restores proper engine isolation and mounting...09330007- SKU:
- 09330007
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
- UNITS:
- EACH
- PRODUCT NAME:
- MOUNT
$56.48Qty in Cart: 0Quantity:Price:$56.48Subtotal: -
WSM Pump Plate Cover - Sea-Doo 010-095
WSM
$29.51A failing oil pump is a silent killer—it starves your engine of lubrication and leads to catastrophic bearing damage. The WSM Pump Plate Cover for Sea-Doo delivers OEM-equivalent reliability with...09320081- SKU:
- 09320081
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- PLATE
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- PUMP COVER
- UNITS:
- EACH
$29.51Qty in Cart: 0Quantity:Price:$29.51Subtotal: -
WSM Crankshaft Assembly 010-1061WSM
WSM
$764.06A reliable crankshaft assembly is the foundation of engine durability and performance—this WSM unit delivers OEM-equivalent specifications without compromise. Whether you're rebuilding a tired engine...09210486- SKU:
- 09210486
- Availability:
- Ships Same Business Day
- Weight:
- 24.30 LBS
- PRODUCT NAME:
- CRANKSHAFT
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- STEEL
- UNITS:
- EACH
$764.06Qty in Cart: 0Quantity:Price:$764.06Subtotal: -
WSM Ring Set 010-920-07
WSM
$35.12Proper ring sealing is fundamental to engine efficiency and longevity—worn or inadequate rings result in blow-by, oil consumption, and lost compression that compounds over time. The WSM Ring Set...09120076- SKU:
- 09120076
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE - OVERSIZE:
- +1,00 MM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
$35.12Qty in Cart: 0Quantity:Price:$35.12Subtotal: -
XCELDYNE Valve Guide Kit - Exhaust CVGM13005
XCELDYNE
$36.63Valve guides are critical to engine longevity—they control oil consumption, maintain precise valve seating, and prevent catastrophic head damage. The XCELDYNE Valve Guide Kit delivers superior...09260608- SKU:
- 09260608
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- MANGANESE-BRONZE
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- UNITS:
- 2 PIECE
$36.63Qty in Cart: 0Quantity:Price:$36.63Subtotal: -
Twin Air Oil Filter for KTM 250 EXC 4-Stroke 2003-2005 450 EXC 2003-2005 450 SX-F 2003-2006 450 XC 2008-2010 140014
TWIN AIR
$14.95A quality oil filter is non-negotiable for engine longevity—it directly impacts how well contaminants are trapped before they cause wear on critical internal components. The Twin Air 140014 delivers...140014- SKU:
- 140014
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- SECOND FILTER FOR DUAL FILTER APPLICATIONS
- TYPE:
- CARTRIDGE
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$14.95Qty in Cart: 0Quantity:Price:$14.95Subtotal: -
VERTEX Piston Kit 23621050
VERTEX
$208.95The VERTEX Piston Kit 23621050 delivers the durability and precision needed for serious engine builds, whether you're chasing peak horsepower or extending component lifespan. With advanced heat...09102053- SKU:
- 09102053
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- DISPLACEMENT:
- 100 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 53.00 MM
- PISTON DIAMETER METRIC:
- 52.95 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$208.95Qty in Cart: 0Quantity:Price:$208.95Subtotal: -
VERTEX Piston Kit 23646A
VERTEX
$256.95The VERTEX Piston Kit 23646A delivers the durability and precision your engine demands, whether you're rebuilding a worn top-end or chasing peak performance. Available in multiple...09102055- SKU:
- 09102055
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$256.95Qty in Cart: 0Quantity:Price:$256.95Subtotal: -
VERTEX Piston Kit - Standard 22809B
VERTEX
$189.95Engine durability under sustained high RPM depends on piston quality—cheap pistons warp, seize, or fail catastrophically. The VERTEX Piston Kit 22809B delivers precision-engineered reliability with...09101034- SKU:
- 09101034
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
$189.95 -
Wiseco Wrist Pin Arctic Cat Cheetah 500 F/C 1986-1988 S513
WISECO
$23.95The Wiseco S513 wrist pin is engineered to handle the demands of high-RPM Arctic Cat Cheetah 500 engines, delivering the reliability you need whether you're racing competitively or pushing...S513- SKU:
- S513
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- APPLICATION:
- PISTON
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER:
- 18,00 MM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- LENGTH:
- 58,5 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- LENGTH METRIC:
- 58.5 MM
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 18.00 MM
$23.95 -
Wiseco Wrist Pin 1987-2005 Kawasaki KX125 S514
WISECO
$23.95The Wiseco Wrist Pin S514 is engineered specifically for 1987-2005 Kawasaki KX125 applications, delivering the precision fit and durability required for high-RPM two-stroke racing. If you're running...S514- SKU:
- S514
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- OUTSIDE DIAMETER:
- 16,00 MM
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 16.00 MM
- LENGTH METRIC:
- 50.6 MM
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- LENGTH:
- 50,6 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$23.95 -
Wiseco Piston Kit Kawasaki KX250 1993-2001 RE926M06640
WISECO
$249.95Your KX250's engine demands a piston built to handle the intense heat, pressure, and detonation cycles of competitive riding. The Wiseco RE926M06640 piston kit delivers the precision fit and...09105097- SKU:
- 09105097
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- TYPE:
- RACER ELITE
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- FORGED
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
$249.95Qty in Cart: 0Quantity:Price:$249.95Subtotal: -
Wiseco Piston Kit with Gaskets Kawasaki KX250 1993-2001 PK1290
WISECO
$269.95The Wiseco PK1290 piston kit restores your KX250's combustion efficiency and throttle response, whether you're chasing lap times or weekend trail rides. Factory pistons wear, lose compression, and...09030254- SKU:
- 09030254
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +1,10 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 67.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +1.10 MM
- BORE SIZE METRIC:
- 67.50 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$269.95Qty in Cart: 0Quantity:Price:$269.95Subtotal: -
WISECO Piston - +1.00 mm - Honda ATC 250 R/TRX250R/CR250R 526M06700
WISECO
$232.95If you're running a Honda ATC250R, TRX250R, or CR250R at the edge of its limits, a worn or stock piston is costing you power and reliability. The Wiseco +1.00 mm oversized piston delivers the...526M06700- SKU:
- 526M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$232.95 -
On Sale
Wiseco Piston Kit for Suzuki PE 125 1980-1984 490M06300
WISECO
MSRP: $154.95Now: $132.00Was: $154.95If you're running a Suzuki PE 125 two-stroke, piston wear is inevitable—and it directly impacts compression, throttle response, and overall engine reliability. A quality piston kit restores lost...490M06300- SKU:
- 490M06300
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- STROKE LENGTH:
- 57,00 MM
- BORE SIZE METRIC:
- 63.00 MM
- DISPLACEMENT:
- 172 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 57.00 MM
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Kit 56.00 mm Oversize for Yamaha YZ125 1997-2004 765M05600
WISECO
MSRP: $199.95Now: $170.00Was: $199.95If you're running a YZ125 hard on the track or trail, piston wear is inevitable—and a failing piston means catastrophic engine damage. The Wiseco 56.00 mm Oversize Piston Kit restores your engine's...765M05600- SKU:
- 765M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- DISPLACEMENT:
- 134 CC
MSRP: $199.95Now: $170.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $170.00Was: $199.95Subtotal: -
On Sale
Wiseco Piston Kit 41.50mm Oversize for Yamaha PW50 2021-2026 653M04150
WISECO
MSRP: $116.95Now: $93.00Was: $116.95Wiseco pistons are built for riders who demand reliable performance upgrades without compromise. If you're running your PW50 hard on the trail or track, this 41.50mm oversize kit delivers the...653M04150- SKU:
- 653M04150
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- +1,50 MM
- DISPLACEMENT:
- 49 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 39,20 MM
- STROKE LENGTH METRIC:
- 39.20 MM
- BORE SIZE METRIC:
- 41.50 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
MSRP: $116.95Now: $93.00Was: $116.95 -
On Sale
Wiseco Piston Kit Standard 67.50mm for KTM 250 SX 1995 655M06750
WISECO
MSRP: $199.95Now: $170.00Was: $199.95The Wiseco Piston Kit Standard 67.50mm is engineered for KTM 250 SX and 250 EXC riders who demand reliable power delivery and engine longevity. High-silicon aluminum construction combined with...601M06750- SKU:
- 601M06750
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249,6 CC
- STROKE LENGTH:
- 69,50 MM
- BORE SIZE METRIC:
- 67.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 69.50 MM
- UNITS:
- EACH
MSRP: $199.95Now: $170.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $170.00Was: $199.95Subtotal: -
On Sale
Wiseco Piston Kit Sea-Doo 3D 947 DI 2006-2007 WK1212
WISECO
MSRP: $469.95Now: $399.00Was: $469.95Top-end wear is inevitable in high-performance PWCs, but premature piston failure doesn't have to be. This Wiseco kit replaces worn or damaged pistons with forged components engineered for the...09031171- SKU:
- 09031171
- Availability:
- Ships Same Business Day
- Weight:
- 4.25 LBS
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 960 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- UNITS:
- KIT
- BORE SIZE METRIC:
- 88.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 88.40 MM
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
MSRP: $469.95Now: $399.00Was: $469.95Qty in Cart: 0Quantity:Price:MSRP: $469.95Now: $399.00Was: $469.95Subtotal: -
On Sale
Wiseco Cam Chain Husqvarna FC450 2016-2018 CC032
WISECO
MSRP: $79.95Now: $68.00Was: $79.95The OEM cam chain on your FC450 is a critical wear item that directly impacts engine reliability and top-end performance. Wiseco's CC032 cam chain tightens tolerances and reduces friction compared to...09250650- SKU:
- 09250650
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 92RH2015
- NUMBER OF LINKS:
- 108
MSRP: $79.95Now: $68.00Was: $79.95Qty in Cart: 0Quantity:Price:MSRP: $79.95Now: $68.00Was: $79.95Subtotal:
