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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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 you're rebuilding a stock engine or preparing for track...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 on the track. At 90mm with a 1.0mm oversize, this...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: $238.95 -
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 11:1 compression piston delivers the precision...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: $160.95 -
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 needs to maintain peak performance across repeated...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 precision engineering and material quality needed for reliable...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: $210.95 -
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 quality piston upgrade directly impacts power delivery,...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 efficiency, and engine longevity—especially critical for...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. Wiseco's 53.00mm oversize design gives you the...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: $148.95 -
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 the demands of both trail abuse and competitive racing...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 ignition/clutch cover from impact and contamination without...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 your existing hardware—no fabrication required. This is...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 crankcase and ignition/clutch cover with durable,...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 impacts that can compromise durability and performance...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 higher flow rates and demanding conditions of racing...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 higher flow rates and chemical concentrations of modern...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 construction provides the flow rates your engine demands...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 dealership pricing, giving you the confidence to tackle...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 hassle of sourcing individual components while delivering...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 formulations, and Japanese zinc-steel construction, this Pro...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 -
PC RACING Oil Filter PC116
PC RACING
$39.95Engine protection starts with filtration. The PC Racing PC116 oil filter uses medical-grade stainless steel to deliver reliable 35-micron filtration across the full operating spectrum—from subzero cold starts to extreme heat. This reusable filter...07120124- SKU:
- 07120124
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- POLISHED
- MICRON RATING:
- 35 MICRONS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- MICRONIC FILTER CLOTH
- MATERIAL:
- STAINLESS STEEL
- STYLE:
- STANDARD
- BASE COLOR:
- SILVER
- FEATURES:
- REUSABLE
- PRODUCT NAME:
- OIL FILTER
- BASE FINISH:
- POLISHED
- MODEL:
- FLO
- RIDING STYLE:
- OFF-ROAD
$39.95
