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 Ring Set 86.50mm Kawasaki KX500 1988-2004 3405TD
WISECO
$57.95Worn or damaged piston rings are a silent killer of engine performance—they bleed compression, spike oil consumption, and rob you of power just when you need it most. The Wiseco Ring Set 3405TD delivers OEM-grade sealing with enhanced durability,...3405TD- SKU:
- 3405TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- BORE SIZE METRIC:
- 86.50 MM
- RIDING STYLE:
- ATV
- UNITS:
- SET
$57.95 -
Wiseco 83mm Piston Ring Set for Kawasaki ZX-12R 2000-2005 3268XG
WISECO
$52.95Proper ring sealing is critical for maintaining compression, controlling blow-by, and maximizing power output in your ZX-12R engine. This Wiseco ring set delivers precision-engineered sealing surfaces that withstand the extreme combustion pressures and...3268XG- SKU:
- 3268XG
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 83.00 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$52.95 -
Wiseco Piston Kit Suzuki DR650S 1990-1993 4597M09600
WISECO
$239.95Stock pistons lose efficiency and durability under demanding riding conditions—whether you're pushing your DR650S on technical trails or logging highway miles. The Wiseco piston kit restores and exceeds OEM performance through precision forging and...09101659- SKU:
- 09101659
- Availability:
- Ships Same Business Day
- Weight:
- 1.27 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 654 CC
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 90.40 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED
$239.95 -
Wiseco Piston Kit Yamaha XT500 1976-1981 87.50mm 9:1 4764M08750
WISECO
$239.95Your XT500 or TT500 demands a piston engineered for reliability under sustained high RPM and load—factory units wear quickly in demanding riding conditions. The Wiseco 4764M08750 kit delivers a high-silicon alloy construction that resists thermal stress...09101666- SKU:
- 09101666
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- BORE - OVERSIZE METRIC:
- +0.05 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 505 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,05 MM
- BORE SIZE METRIC:
- 87.50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 84.00 MM
- UNITS:
- EACH
$239.95 -
Wiseco 200 EXC 1998-2002 Piston Kit with Gaskets PK1369
WISECO
$269.95If you're rebuilding your KTM 200 EXC or MXC, engine wear directly impacts throttle response and reliability. Wiseco's forged piston kit restores lost compression and power while the included gasket set ensures a clean, sealed rebuild without additional...09030512- SKU:
- 09030512
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- DISPLACEMENT:
- 193 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 64.00 MM
- PISTON DIAMETER METRIC:
- 63.95 MM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 60.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
$269.95 -
Wiseco Piston Kit Yamaha YZ85 2002-2021 5.50mm Oversize 767M05250
WISECO
$177.95If you're running a Yamaha YZ85 hard—whether on the track or in practice—piston wear directly impacts power delivery and reliability. The Wiseco 767M05250 is engineered to restore lost compression and add measurable performance gains while handling the...09100366- SKU:
- 09100366
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE - OVERSIZE METRIC:
- +5.50 MM
- DISPLACEMENT:
- 103,5 CC
- STROKE LENGTH METRIC:
- 47.80 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 52.50 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- BORE - OVERSIZE:
- +5,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
$177.95 -
Wiseco Piston Kit 47.50mm 11:1 Yamaha TT-R90 2003 4840M04750
WISECO
$160.95If you're running a Yamaha TTR90 and want measurable gains in power and throttle response, a high-compression piston kit is one of the most direct upgrades available. The Wiseco 47.50mm 11:1 kit delivers a noticeable bump in output while maintaining the...09100369- SKU:
- 09100369
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 92 CC
- STROKE LENGTH METRIC:
- 51.80 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
$160.95 -
Wiseco Piston Kit Standard Yamaha XT 350 1985-2000 4674M08700
WISECO
$199.95If you're running a Yamaha XT350 or TT350 and want reliable power gains without compromising engine longevity, a quality piston kit is essential. The Wiseco Piston Kit Standard delivers measurable improvements in combustion efficiency and responsiveness...09101661- SKU:
- 09101661
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- BORE SIZE METRIC:
- 87.00 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 354 CC
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 59.60 MM
$199.95 -
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 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 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 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 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 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 maintaining the durability required for consistent,...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
