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!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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On Sale
Wiseco Piston Kit 65.5mm 11:1 Compression Honda CRF230F 2003-2019 4816M06550
WISECO
MSRP: $169.95Now: $144.00Was: $169.95Your CRF230F's piston is the heart of combustion—wear or damage directly impacts power delivery and throttle response. The Wiseco 65.5mm 11:1 compression piston kit restores lost performance and...09100332- SKU:
- 09100332
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 65.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 223,00 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 66.20 MM
MSRP: $169.95Now: $144.00Was: $169.95Qty in Cart: 0Quantity:Price:MSRP: $169.95Now: $144.00Was: $169.95Subtotal: -
On Sale
Wiseco Piston Honda CB750 1979-1982 871M08950
WISECO
MSRP: $238.95Now: $200.00Was: $238.95The Wiseco piston is engineered to restore or exceed OEM performance specifications for your Honda CB750, delivering reliable compression and consistent power delivery across the RPM range. Whether...09102023- SKU:
- 09102023
- Availability:
- Ships Same Business Day
- Weight:
- 1.24 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 89.50 MM
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- EACH
- DISPLACEMENT:
- 472 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 76.00 MM
- PISTON MATERIAL:
- FORGED
MSRP: $238.95Now: $200.00Was: $238.95 -
On Sale
Wiseco Piston Kit Honda CR500R 1984-2001 90mm 871M09000
WISECO
MSRP: $238.95Now: $200.00Was: $238.95If you're running a CR500R and want to reclaim lost compression or rebuild after a top-end failure, the Wiseco 871M09000 piston kit delivers the precision-engineered reliability you need to get back...09102024- SKU:
- 09102024
- Availability:
- Ships Same Business Day
- Weight:
- 1.27 LBS
- DISPLACEMENT:
- 472 CC
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 79.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 90.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 491 CC
- PISTON MATERIAL:
- ALUMINUM
MSRP: $238.95Now: $200.00Was: $238.95Qty in Cart: 0Quantity:Price:MSRP: $238.95Now: $200.00Was: $238.95Subtotal: -
On Sale
Wiseco Piston Kit 47mm 11:1 Compression Yamaha TT-R90 2000-2007 4840M04700
WISECO
MSRP: $160.95Now: $132.00Was: $160.95Whether you're rebuilding a TT-R90 for trail duty or maximizing performance in the dirt bike circuit, an OEM-spec piston kit is essential for reliable power and cylinder longevity. The Wiseco 47mm...09100368- SKU:
- 09100368
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 51.80 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- DISPLACEMENT:
- 90 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
MSRP: $160.95Now: $132.00Was: $160.95Qty in Cart: 0Quantity:Price:MSRP: $160.95Now: $132.00Was: $160.95Subtotal: -
On Sale
Wiseco Honda CRF450R 2002-2008 Piston Kit with Gaskets PK1365
WISECO
MSRP: $359.95Now: $276.00Was: $359.95A top-end rebuild demands precision components that can handle sustained high RPM loads without compromise. The Wiseco Honda CRF450R Piston Kit delivers the strength and thermal stability your engine...09030567- SKU:
- 09030567
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- TYPE:
- TOP END
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 95.94 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
MSRP: $359.95Now: $276.00Was: $359.95 -
On Sale
Wiseco Piston Kit 70.50mm Oversize for Yamaha IT250 1978-1980 234M07050
WISECO
MSRP: $210.95Now: $170.00Was: $210.95When your Yamaha IT250's original piston reaches its limit, a quality oversize replacement is essential to restore compression and power delivery. The Wiseco 70.50mm oversize kit delivers the...234M07050- SKU:
- 234M07050
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 64.00 MM
- DISPLACEMENT:
- 246 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 70.45 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 70.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
MSRP: $210.95Now: $170.00Was: $210.95Qty in Cart: 0Quantity:Price:MSRP: $210.95Now: $170.00Was: $210.95Subtotal: -
On Sale
Wiseco Piston Kit Kawasaki KX250F 2011-2014 77mm 14.5:1 40020M07700
WISECO
MSRP: $264.95Now: $225.00Was: $264.95The Wiseco Piston Kit for your KX250F delivers the precision engineering and durability needed to maintain peak combustion efficiency and throttle response in competitive or recreational riding. A...09102896- SKU:
- 09102896
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 53.60 MM
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- DISPLACEMENT:
- 250 CC
MSRP: $264.95Now: $225.00Was: $264.95 -
On Sale
Wiseco Piston Kit for KTM 500 EXC 2012-2016 40064M09500
WISECO
MSRP: $265.95Now: $217.00Was: $265.95The Wiseco Piston Kit is engineered for KTM 500 EXC riders who demand reliable top-end performance without compromise. A quality piston upgrade directly impacts throttle response, combustion...09102898- SKU:
- 09102898
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 95.00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- PISTON MATERIAL:
- FORGED
- DISPLACEMENT:
- 510 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $265.95Now: $217.00Was: $265.95 -
On Sale
Wiseco Piston Kit 53.00mm 1.00mm Oversize Yamaha MX100 1979-1983 235M05300
WISECO
MSRP: $148.95Now: $119.00Was: $148.95Whether you're rebuilding a vintage Yamaha MX100 or pushing your 1979-1983 machine to its limits on the track, a quality piston kit is critical to maintaining reliable power and combustion efficiency...235M05300- SKU:
- 235M05300
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 98 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 52.95 MM
- BORE SIZE METRIC:
- 53.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.60 MM
MSRP: $148.95Now: $119.00Was: $148.95Qty in Cart: 0Quantity:Price:MSRP: $148.95Now: $119.00Was: $148.95Subtotal: -
On Sale
Wiseco Piston Kit Yamaha DT400 1975-1978 85.50mm 232M08550
WISECO
MSRP: $209.95Now: $178.00Was: $209.95If you're running a Yamaha DT400 and want to restore lost compression or build a higher-displacement engine, a quality piston kit is non-negotiable. Wiseco's high-silicon alloy construction handles...232M08550- SKU:
- 232M08550
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 85.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON DIAMETER METRIC:
- 85.42 MM
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 397 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 70.00 MM
MSRP: $209.95Now: $178.00Was: $209.95 -
ACERBIS X-Power Cover Kit - Black - Honda 2791950001
ACERBIS
$69.95Engine casings are vulnerable to mud, rocks, and debris—especially in off-road and trail conditions where protection matters most. The ACERBIS X-Power Cover Kit shields both your crankcase and...09401891- SKU:
- 09401891
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- MODEL:
- X-POWER
- COLOR/FINISH:
- BLACK
- MATERIAL:
- PLASTIC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- COVER
- PRODUCT NAME:
- COVER KIT
$69.95 -
ACERBIS X-Power Cover Kit - White - KTM/Husqvarna 2731970002
ACERBIS
$63.95Protect your engine from track debris and impacts without compromising airflow or serviceability. The ACERBIS X-Power Cover Kit combines durable construction with direct bolt-on installation using...09401762- SKU:
- 09401762
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- COLOR/FINISH:
- WHITE
- MATERIAL:
- PLASTIC
- PRODUCT NAME:
- COVER
- TYPE:
- ENGINE
- MODEL:
- X-POWER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$63.95 -
ACERBIS X-Power Cover Kit - Orange - KTM/Husqvarna 2645515226
ACERBIS
$69.95If you're riding hard on the trails or track, your engine cases take a beating from flying rocks, roost, and impact damage that can lead to costly repairs. The ACERBIS X-Power Cover Kit shields your...09401763- SKU:
- 09401763
- Availability:
- Ships Same Business Day
- Weight:
- 1.51 LBS
- COLOR/FINISH:
- ORANGE
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- PLASTIC
- MODEL:
- X-POWER
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
$69.95 -
ACERBIS X-Power Cover Kit - White - KTM/Husqvarna 2645510002
ACERBIS
$67.95Protect your engine's critical components from the punishment of trail riding and racing. The ACERBIS X-Power Cover Kit shields your crankcase and ignition/clutch cover from flying debris, mud, and...09401765- SKU:
- 09401765
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COLOR/FINISH:
- WHITE
- MODEL:
- X-POWER
- RIDING STYLE:
- STREET
- MATERIAL:
- PLASTIC
- PRODUCT NAME:
- COVER
- TYPE:
- ENGINE
$67.95Qty in Cart: 0Quantity:Price:$67.95Subtotal: -
K & N Oil Filter KN-655
K & N
$11.99If you're running synthetic or synthetic blended oils in your high-performance engine, your stock oil filter simply won't keep pace. The K&N KN-655 is engineered with synthetic media that handles the...07120119- SKU:
- 07120119
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- BASE COLOR:
- YELLOW
- BASE FINISH:
- NATURAL
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- YELLOW
- LENGTH METRIC:
- 69 MM
$11.99 -
K & N Oil Filter KN-611
K & N
$11.99Synthetic racing oils demand a filter engineered to match their performance capabilities—and the K&N KN-611 delivers exactly that. Built with synthetic media specifically formulated to handle the...07120388- SKU:
- 07120388
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BASE FINISH:
- NATURAL
- LENGTH METRIC:
- 88 MM
- STYLE:
- STANDARD
- BASE COLOR:
- RED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
- COLOR/FINISH:
- RED
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
$11.99 -
K & N Oil Filter KN-183
K & N
$16.99If you're running synthetic or synthetic-blend oils in your high-performance engine, you need a filter built to handle them—and that's exactly what the K&N KN-183 delivers. The synthetic media...07120500- SKU:
- 07120500
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BASE COLOR:
- BLACK
- BASE FINISH:
- COATED
- STYLE:
- PREMIUM
- LENGTH METRIC:
- 78 MM
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- TYPE:
- SPIN-ON
- COLOR/FINISH:
- BLACK
- FEATURES:
- INCLUDES NUT
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- UNITS:
- EACH
$16.99 -
MOOSE RACING Complete Gasket Kit with Oil Seal - KX 811417
MOOSE RACING
$73.14A complete engine and transmission rebuild requires precision gaskets and seals that won't compromise your work or your wallet. This MOOSE RACING kit delivers OEM-quality components at a fraction of...09340875- SKU:
- 09340875
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$73.14 -
MOOSE RACING Complete Gasket and Oil Seal Kit 811337
MOOSE RACING
$107.09A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work or reliability. The MOOSE RACING Complete Gasket and Oil Seal Kit eliminates the...09341905- SKU:
- 09341905
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$107.09 -
PARTS UNLIMITED Oil Filter T14-4017
PARTS UNLIMITED
$7.09Engine protection starts with filtration—and the PARTS UNLIMITED Oil Filter T14-4017 delivers the reliability your engine demands. Built with premium German filter media, English adhesive...07120532- SKU:
- 07120532
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BASE COLOR:
- ORANGE
- STYLE:
- STANDARD
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- COLOR/FINISH:
- ORANGE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
$7.09
