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 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...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...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...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...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...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...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...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...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...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...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
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
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...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...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...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...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...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...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...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: -
Wiseco Piston Kit Yamaha YZ465 1980-1981 1.50mm 451M08650
WISECO
$244.95If you're running a YZ465 from the early '80s, piston longevity directly impacts your race results and trail reliability. This Wiseco kit delivers the strength you need for high-RPM demands while...451M08650- SKU:
- 451M08650
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- DISPLACEMENT:
- 465 CC
- BORE - OVERSIZE:
- +1,50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.50 MM
- MODEL:
- FORGED SERIES
- BORE SIZE METRIC:
- 86.50 MM
- PISTON DIAMETER METRIC:
- 86.42 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 82.00 MM
- UNITS:
- KIT
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
Wiseco Piston Kit Racer Elite Kawasaki KX250F 2015-2016 RE801M07700
WISECO
$369.95If you're serious about maximizing your KX250F's output, a quality piston kit is non-negotiable. Wiseco's Racer Elite design delivers measurable gains in throttle response and mid-range power while...09105070- SKU:
- 09105070
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- BORE SIZE METRIC:
- 77.00 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORGLIDE®
$369.95 -
WISECO Piston Kit - Racer Elite - YZ250F RE802M07700
WISECO
$369.95If you're running a YZ250F, YZ250FX, or WR250F and want measurable power gains without sacrificing reliability, the Wiseco Racer Elite piston kit is engineered to deliver both. The 14.5:1 compression...09105071- SKU:
- 09105071
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- ENGINE TYPE:
- 4-STROKE
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORGLIDE®
$369.95
