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
-
Wiseco Piston Kit with Gaskets for Suzuki RM80 1991-2001 PK1521
WISECO
$192.95If you're running a classic Suzuki RM80 and want to extract genuine performance gains without guesswork, a quality top-end rebuild is non-negotiable. The Wiseco PK1521 delivers the precision engineering and complete component package you need to...09030703- SKU:
- 09030703
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- DISPLACEMENT:
- 82 CC
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.50 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON DIAMETER METRIC:
- 47.45 MM
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 46.80 MM
$192.95Qty in Cart: 0Quantity:Price:$192.95Subtotal: -
Wiseco Piston Kit Yamaha YZ85 2002-2024 48.00mm 0.50mm Oversize 805M04800
WISECO
$119.95When your YZ85's factory piston reaches its limit, a quality oversize replacement is essential for restoring compression and power. The Wiseco 805M04800 delivers the precision engineering and durability you need to keep your bike competitive, whether...09101246- SKU:
- 09101246
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 85 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
Wiseco Piston Kit 49.00mm Suzuki RM85 2002-2020 806M04900
WISECO
$119.95The stock piston in your RM85 can only take so much abuse before wear compromises performance and reliability. Wiseco's 806M04900 delivers the durability and precision fit you need to maintain peak horsepower and throttle response, whether you're...09101249- SKU:
- 09101249
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 49.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 84.7 CC
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$119.95 -
Wiseco Piston Kit Honda CR85R 2003-2007 833M04850
WISECO
$119.95The Wiseco 833M04850 is a precision-engineered piston kit built for 2-stroke engines that demand consistent power delivery and reliability. If you're serious about maintaining peak performance in your CR85R, this complete kit eliminates guesswork with...09101253- SKU:
- 09101253
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE METRIC:
- 48.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 47.80 MM
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 84,7 CC
- PISTON MATERIAL:
- FORGED
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
Wiseco Piston Kit Yamaha YZ125 2005-2021 846M05800
WISECO
$210.95The piston is the heart of your YZ125's engine—responsible for transferring combustion force into usable power. A worn or stock piston limits your bike's potential, reducing compression efficiency and increasing blow-by. The Wiseco 846M05800 restores and...09101255- SKU:
- 09101255
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +4.00 MM
- BORE SIZE METRIC:
- 58.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +4,00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- RIDING STYLE:
- OFF-ROAD
$210.95 -
Wiseco Piston Kit 90.5mm 1.5mm Oversize Honda CR500R 1984-2001 871M09050
WISECO
$255.95The Wiseco 871M09050 delivers the compression and durability required to extract maximum power from your CR500R while maintaining reliability through extended high-rpm operation. Built with aerospace-grade aluminum and precision CNC machining, this...09102025- SKU:
- 09102025
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 76.00 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.50 MM
- BORE SIZE METRIC:
- 90.50 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,50 MM
- DISPLACEMENT:
- 508 CC
$255.95 -
Wiseco Piston Kit Standard 41mm for Kawasaki KFX50 2003-2009 826M04100
WISECO
$121.95If you're running a KFX50 and want reliable power without compromise, the Wiseco 826M04100 Piston Kit delivers the precision engineering needed for consistent performance across racing and trail conditions. This complete kit eliminates guesswork—you get...09100339- SKU:
- 09100339
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 41.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 37.80 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- DISPLACEMENT:
- 49 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$121.95 -
Wiseco Piston Kit 41.50 mm Oversize for Kawasaki KFX 50 2003-2009 826M04150
WISECO
$104.95When you're rebuilding a 2-stroke engine, piston quality directly impacts power delivery, engine longevity, and overall reliability. The Wiseco 826M04150 delivers precision-engineered performance with aerospace-grade materials designed to handle the...09100340- SKU:
- 09100340
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 37.80 MM
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 49 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 41.50 MM
$104.95Qty in Cart: 0Quantity:Price:$104.95Subtotal: -
Wiseco Piston Kit 42.00 mm Oversize Kawasaki KFX50 2003-2009 Suzuki JR50 1978-2006 826M04200
WISECO
$104.95When you're pushing a 2-stroke engine to its limits, a worn or undersized piston compromises compression, throttle response, and reliability. The Wiseco 826M04200 restores lost performance and durability with precision engineering and aerospace-grade...09100341- SKU:
- 09100341
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- DISPLACEMENT:
- 49 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 42.00 MM
- STROKE LENGTH METRIC:
- 37.80 MM
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$104.95Qty in Cart: 0Quantity:Price:$104.95Subtotal: -
Wiseco Piston Kit 43.00 mm Oversize for Kawasaki KFX 50 2003-2009 826M04300
WISECO
$109.95When you're ready to push your KFX 50 past factory limits, a quality piston kit is non-negotiable. Wiseco's 826M04300 delivers the precision engineering and durability needed for serious ride time—whether you're racing competitively or upgrading your...09100343- SKU:
- 09100343
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 49 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 37.80 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE SIZE METRIC:
- 43.00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- PRODUCT NAME:
- PISTON
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
Wiseco Piston Kit 54.50 mm Kawasaki KX100 1995-2013 Suzuki RM100 2003 651M05450
WISECO
$139.95When your 2-stroke engine is the difference between winning and second place, every component matters. The Wiseco 651M05450 Pro-Lite Piston Kit delivers the precision engineering and thermal durability your KX100 or RM100 demands, whether you're pushing...09100345- SKU:
- 09100345
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE METRIC:
- 54.50 MM
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 99 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$139.95 -
Wiseco Piston Kit Kawasaki KX125 2004-2008 56.00 mm 2.00 mm Oversize 834M05600
WISECO
$174.95A worn or stock piston limits your KX125's potential—this Wiseco Pro-Lite kit restores compression, throttle response, and engine longevity with precision-engineered components built for 2-stroke demands. Whether you're chasing track times or pushing...09100347- SKU:
- 09100347
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 133 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$174.95 -
Wiseco Piston Kit 77mm 13.1:1 Compression for 2004-2005 Kawasaki KX250F 2004-2006 Suzuki RM-Z250 4842M07700
WISECO
$224.95If you're rebuilding a KX250F or RM-Z250 engine or pushing for higher output on the track, a quality piston kit is non-negotiable. The Wiseco 4842M07700 delivers the compression ratio and material quality needed to support increased horsepower and...09100354- SKU:
- 09100354
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 53.60 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit 77.00mm 14.1:1 Compression Kawasaki KX250F 2004-2005 Suzuki RM-Z250 2004-2006 4843M07700
WISECO
$264.95If you're running a KX250F or RM-Z250 and want measurable gains in peak power and mid-range response, a high-compression piston kit is one of the most direct bolt-on upgrades available. The Wiseco 4843M07700 delivers a 14.1:1 compression ratio with...09100356- SKU:
- 09100356
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 53.60 MM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$264.95 -
Wiseco RM125 2004-2007 Piston Kit 2.00mm Oversize 835M05600
WISECO
$177.95If you're running a 2004-2007 Suzuki RM125 and need to restore lost compression or step up displacement for more mid-range power, a quality piston kit is non-negotiable. The Wiseco 835M05600 delivers the precision engineering and durability you expect...09100358- SKU:
- 09100358
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 134 CC
$177.95Qty in Cart: 0Quantity:Price:$177.95Subtotal: -
Wiseco Piston Kit 58mm 11:1 Compression for 2003-2006 Kawasaki KLX125 4815M05800
WISECO
$154.95If you're running a KLX125 and want measurable gains in acceleration and reliability, an 11:1 compression piston kit is one of the most effective upgrades available. The Wiseco 4815M05800 delivers forged aluminum construction that handles the stress of...09100361- SKU:
- 09100361
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 48.80 MM
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 58.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 46.50mm for Kawasaki KX65 2000-2020 and Suzuki RM65 2003-2005 PK1179
WISECO
$186.95Top-end wear is inevitable on high-performance 2-stroke machines, but a worn piston kit kills compression, power delivery, and reliability when you need it most. The Wiseco PK1179 restores your KX65 or RM65 to factory specifications with aerospace-grade...09030514- SKU:
- 09030514
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 46.50 MM
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 46.45 MM
- TYPE:
- TOP END
- SKIRT COATING:
- NON-COATED
$186.95Qty in Cart: 0Quantity:Price:$186.95Subtotal: -
Wiseco Piston Kit 54.50mm for Kawasaki KX100 1998-2013 PK1156
WISECO
$220.95If you're running a Kawasaki KX100 and want reliable top-end performance that actually delivers, a quality piston kit isn't optional—it's essential. The Wiseco PK1156 gives you forged pistons engineered for the thermal demands of competitive riding, with...09030515- SKU:
- 09030515
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 99 CC
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 54.45 MM
- TYPE:
- TOP END
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE SIZE METRIC:
- 54.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$220.95 -
Wiseco Piston Kit 97mm 13.5:1 Compression for 2007-2012 KTM 450 SX-F 4938M09700
WISECO
$284.95If you're running a KTM 450 SX-F or XC-F and want measurable gains in power and throttle response, a quality piston kit is one of the highest-impact upgrades you can make. The Wiseco 4938M09700 delivers a 13.5:1 compression ratio that extracts real...09100851- SKU:
- 09100851
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 60.80 MM
- DISPLACEMENT:
- 449 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 97.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- MOLY COATED
$284.95 -
Wiseco Suzuki RM85 2002-2023 48.50mm Piston Kit PK1207
WISECO
$186.95A properly rebuilt top end is non-negotiable for RM85 reliability and performance. The Wiseco PK1207 delivers the precision-engineered pistons and complete gasket set you need to restore compression, recover lost power, and extend engine life through...09030544- SKU:
- 09030544
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 48.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- STROKE LENGTH METRIC:
- 46.80 MM
- DISPLACEMENT:
- 84.7 CC
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 48.45 MM
- SKIRT COATING:
- ARMORGLIDE®
$186.95Qty in Cart: 0Quantity:Price:$186.95Subtotal:
