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 Piston Kit - +4.50 mm - CR 85/80 766M05200
WISECO
$177.95The Wiseco Piston Kit delivers the high-temperature durability and precision geometry your Honda CR80R or CR85R needs to perform consistently at the edge of the track. Designed with proven coatings that reduce wear and friction while maintaining peak...09100322- SKU:
- 09100322
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +4.50 MM
- BORE SIZE METRIC:
- 52.00 MM
- DISPLACEMENT:
- 101,50 CC
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- BORE - OVERSIZE:
- +4,50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 47.80 MM
$177.95Qty in Cart: 0Quantity:Price:$177.95Subtotal: -
Wiseco Piston Kit 0.50mm Oversize for 2004-2013 Honda CRF80F 4665M04800
WISECO
$160.95If you're rebuilding your Honda 80cc engine or pushing it to its limits on the track, a quality piston kit is fundamental to reliability and performance. The Wiseco 0.50mm oversize piston restores your engine to like-new compression while delivering...09100324- SKU:
- 09100324
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 81 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
$160.95 -
Wiseco Piston Kit 78mm 10.5:1 Compression for 1986-2004 Honda XR250R 4466M07800
WISECO
$238.95If you're running a Honda XR250R or XR250L and want measurable gains in power and throttle response, a quality piston kit is one of the most direct upgrades you can make. The Wiseco 78mm 10.5:1 compression kit increases combustion efficiency and...09100755- SKU:
- 09100755
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +5,00 MM
- BORE SIZE METRIC:
- 78.00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +5.00 MM
- PRODUCT NAME:
- PISTON
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 59.50 MM
- UNITS:
- EACH
$238.95 -
Wiseco Piston Kit Honda CRF450R 2017-2025 4823M09600
WISECO
$269.95The stock piston in your CRF450R limits your engine's potential—increased heat stress, carbon buildup, and efficiency losses rob you of power and reliability. This Wiseco piston kit replaces those compromises with race-proven technology that delivers...09100758- SKU:
- 09100758
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- EACH
$269.95Qty in Cart: 0Quantity:Price:$269.95Subtotal: -
Wiseco Piston Kit 52mm 2003-2018 KTM 85/105 SX 855M05200
WISECO
$177.95Two-stroke engines demand precision components that can handle extreme combustion pressures and heat cycles. The Wiseco Piston Kit 855M05200 delivers exactly that—a CNC-machined, high-silicon aluminum piston engineered to maximize power output while...09030587- SKU:
- 09030587
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 104 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 48.95 MM
- BORE SIZE METRIC:
- 52.00 MM
- ENGINE TYPE:
- 2-STROKE
$177.95 -
Wiseco 200 EXC 1998-2016 Piston Kit 2.00mm Oversize 770M06600
WISECO
$184.95If you're running a KTM 200 EXC between 1998-2016 and want to reclaim lost compression and restore factory performance, a piston replacement is essential maintenance. This Wiseco kit delivers OEM-quality reliability with 2.00mm oversize dimensions,...09100776- SKU:
- 09100776
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 60.00 MM
- BORE SIZE METRIC:
- 66.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 193 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
$184.95 -
Wiseco Piston Kit 66.40mm for KTM 250 SX 2005-2016 856M06640
WISECO
$205.95A worn or stock piston limits your KTM 250's potential—this Wiseco kit restores compression, improves throttle response, and delivers the reliability needed for sustained high-RPM performance. Whether you're chasing lap times or pushing through technical...09100778- SKU:
- 09100778
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORGLIDE®
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$205.95 -
Wiseco Piston Kit Standard KTM 300 EXC 2017 858M07200
WISECO
$234.95The Wiseco Piston Kit is engineered for KTM 300 EXC riders who demand reliability and consistent power delivery in demanding terrain. A quality piston directly impacts engine longevity and performance—worn or inferior pistons lead to compression loss,...09100779- SKU:
- 09100779
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 297 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 73.00 MM
$234.95Qty in Cart: 0Quantity:Price:$234.95Subtotal: -
Wiseco Piston Kit 95mm 13:1 Compression for KTM 450 SX 2003-2007 4806M09500
WISECO
$284.95If you're running a KTM 450 SX and want measurable gains in power delivery and engine durability, a high-compression piston kit is one of the most direct upgrades available. The Wiseco 13:1 compression ratio significantly improves combustion efficiency,...09100785- SKU:
- 09100785
- Availability:
- Ships Same Business Day
- Weight:
- 0.97 LBS
- BORE SIZE METRIC:
- 95.00 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- DISPLACEMENT:
- 449 CC
- STROKE LENGTH METRIC:
- 63.40 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$284.95Qty in Cart: 0Quantity:Price:$284.95Subtotal: -
Wiseco Piston Kit 0.50mm Oversize 70.00mm Bore Husqvarna CR250 WR250 1974-1984 137M07000
WISECO
$199.95Stock pistons are engineered for longevity, not peak performance—and every heat cycle pushes them closer to failure. The Wiseco Piston Kit delivers the precision engineering and premium materials needed to restore your Husqvarna CR250 or WR250 to...137M07000- SKU:
- 137M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- STROKE LENGTH METRIC:
- 64.50 MM
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 244.70 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$199.95 -
Wiseco Husqvarna CR250 1974-1984 1.0mm Piston Kit 137M07050
WISECO
$199.95The Wiseco Husqvarna CR250 Piston Kit delivers the precision engineering your classic machine needs to run at peak efficiency. A worn or stock piston limits your engine's potential—this high-silicon aluminum replacement restores compression, improves...137M07050- SKU:
- 137M07050
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 244.70 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 64.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 70.50 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 70.45 MM
$199.95 -
Wiseco Piston Kit 1.50mm Oversize 71.00mm for Husqvarna CR250 1974-1984 137M07100
WISECO
$224.95If you're running a vintage Husqvarna CR250 or WR250, a worn piston kit directly limits your engine's ability to seal combustion pressure and maintain rpm stability. The Wiseco 1.50mm oversize piston restores compression and responsiveness while the...137M07100- SKU:
- 137M07100
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE:
- +1,50 MM
- STROKE LENGTH METRIC:
- 64.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 70.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.50 MM
- DISPLACEMENT:
- 244.70 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 71.00 MM
- PRODUCT NAME:
- PISTON KIT
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit Kawasaki KX500 1988-2004 88mm 575M08800
WISECO
$244.95The Kawasaki KX500's performance hinges on reliable internal components that can withstand the demands of both trail and track riding. The Wiseco Piston Kit delivers the precision engineering and material quality necessary to maintain consistent power...09102866- SKU:
- 09102866
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 86.00 MM
- BORE SIZE METRIC:
- 88.00 MM
- DISPLACEMENT:
- 523 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$244.95 -
Wiseco Piston Kit Yamaha YZ125 1990-1992 594M05700
WISECO
$154.95A worn or damaged piston directly compromises your YZ125's power output, throttle response, and engine reliability. The Wiseco Pro-Lite Piston Kit restores—and exceeds—OEM performance through precision forging and optimized ring geometry, keeping your...09102867- SKU:
- 09102867
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 50.70 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 57.00 MM
- DISPLACEMENT:
- 129 CC
- BORE - OVERSIZE:
- +1,00 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 57.00mm Oversize for Suzuki DS125 1979-1981 449M05700
WISECO
$154.95If you're running a classic Suzuki two-stroke and need to restore compression or bump displacement, a quality piston kit is non-negotiable. Wiseco's 57.00mm oversize piston delivers the precision fit and thermal stability required for reliable...449M05700- SKU:
- 449M05700
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- STROKE LENGTH METRIC:
- 50.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 57.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 56.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 56.5mm for 1982-1984 Honda CR125R 448M05650
WISECO
$162.95If you're running a CR125R hard on the track or trail, piston wear directly impacts your power delivery and engine reliability. The Wiseco 56.5mm piston kit restores—or exceeds—OEM performance with premium materials and precision engineering that handles...448M05650- SKU:
- 448M05650
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 56.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 56.44 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- DISPLACEMENT:
- 120 CC
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 50.00 MM
- UNITS:
- KIT
$162.95 -
Wiseco Piston Kit Honda CR125R 1979-1984 57.5mm Bore 448M05750
WISECO
$179.95If you're running a CR125R between 1979 and 1984, piston wear directly impacts throttle response, power delivery, and engine longevity. The Wiseco 448M05750 replaces worn or damaged pistons with a high-silicon alloy design that restores lost performance...448M05750- SKU:
- 448M05750
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 57.44 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 123 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 50.00 MM
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 120 CC
- BORE SIZE METRIC:
- 57.50 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$179.95 -
Wiseco Piston Honda CB500F 2013-2025 4466M07300
WISECO
$210.95If you're running a Honda CB500F and want to extract measurable gains in power and reliability, a quality piston upgrade is one of the most direct paths to getting there. Wiseco's forged-aluminum construction and titanium nitride-coated rings deliver the...4466M07300- SKU:
- 4466M07300
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 73.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON DIAMETER METRIC:
- 72.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STROKE LENGTH METRIC:
- 59.50 MM
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
$210.95 -
Wiseco Piston Kit 73.50mm 10.5:1 Compression Yamaha TTR250 1999-2006 4689M07350
WISECO
$194.95Stock pistons are a limiting factor when you're pushing your TT-R250 to its limits. The Wiseco 73.50mm piston kit delivers the compression ratio and material science necessary for reliable power gains, whether you're running harder jetting or higher...4689M07350- SKU:
- 4689M07350
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 73.50 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 73.45 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- ENGINE TYPE:
- 4-STROKE
- STROKE LENGTH METRIC:
- 59.60 MM
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$194.95Qty in Cart: 0Quantity:Price:$194.95Subtotal: -
Wiseco Piston Kit 95mm 12.5:1 Compression for 2000-2002 Yamaha YZ426F 4693M09500
WISECO
$239.95If you're pushing your YZ426F or WR426F to its limits, a worn or stock piston compromises both reliability and peak power output. The Wiseco Piston Kit delivers the compression ratio and engineering precision needed to unlock faster acceleration and...4693M09500- SKU:
- 4693M09500
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- DISPLACEMENT:
- 426 CC
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 94.92 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 95.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 60.10 MM
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal:
