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 1.00mm Oversize for 2005 Honda CR125R 564M05500
WISECO
$154.95When you're pushing a 2-stroke to its limits, a worn or damaged piston becomes your weakest link. The Wiseco 564M05500 restores lost compression and power by delivering precise OEM fitment with...564M05500- SKU:
- 564M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON KIT
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Standard Kawasaki KX125 1988-1989 566M05600
WISECO
$154.95If you're running a 1988–1989 Kawasaki KX125, piston wear directly impacts combustion efficiency, throttle response, and engine longevity. The Wiseco 566M05600 restores—or exceeds—OEM performance...566M05600- SKU:
- 566M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 50.60 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 50,6 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Standard Suzuki RM 125 1985-1986 519M05400
WISECO
$154.95If you're pushing your RM 125 to the limit, factory pistons won't cut it. The Wiseco Performance Piston delivers the strength and thermal stability required for sustained high-RPM racing, while its...511M05400- SKU:
- 511M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +1,50 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 123 CC
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 54,00 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 55.00mm Oversize for Suzuki RM125 1981-1984 511M05500
WISECO
$154.95When your RM125's factory piston reaches its limits, a quality oversize replacement is your path to restored compression, reliable power delivery, and extended engine life. The Wiseco 511M05500...511M05500- SKU:
- 511M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 54,00 MM
- UNITS:
- EACH
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston 50mm Overbore Honda CR125R 1998-2007 518M05450
WISECO
$154.95When you're pushing a 2-stroke to its limits, the piston is where combustion meets durability. A worn or poorly-fitted piston will bleed power, increase heat stress, and shorten your engine's...518M05450- SKU:
- 518M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH:
- 54,00 MM
- BORE SIZE METRIC:
- 54.50 MM
- PISTON MATERIAL:
- ALUMINUM
$154.95 -
Wiseco Piston Kit 56mm Bore Honda CR125R 2004-2007 841M05600
WISECO
$179.95If you're running a Honda CR125R 2-stroke, piston wear is inevitable—and it directly impacts throttle response, compression, and lap times. The Wiseco 518M05600 delivers OEM-spec bore precision with...518M05600- SKU:
- 518M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM
- STROKE LENGTH:
- 54,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Standard Yamaha YZ80 1987 520M04800
WISECO
$141.95The Wiseco 520M04800 is a complete piston kit engineered for the Yamaha YZ80 to restore your engine's compression and combustion efficiency after high-hour use or a top-end rebuild. Whether you're...520M04800- SKU:
- 520M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH METRIC:
- 45.60 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 45,60 MM
$141.95 -
Wiseco Piston Kit 48.50mm Yamaha YZ80 1985-1987 520M04850
WISECO
$134.95A worn or damaged piston directly cuts into your YZ80's power output and engine reliability. The Wiseco 520M04850 restores—or exceeds—OEM performance with aerospace-grade construction and precision...520M04850- SKU:
- 520M04850
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 48.50 MM
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH:
- 45,60 MM
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.60 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
$134.95 -
Wiseco Piston Kit 48.00 mm Yamaha YZ 80 1982-1983 477M04800
WISECO
$134.95The stock piston in your YZ80 is a wear item with a finite lifespan—especially if you're pushing harder on the track or trail. The Wiseco 520M04900 restores lost compression, responsiveness, and...520M04900- SKU:
- 520M04900
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 45,60 MM
- BORE SIZE METRIC:
- 49.00 MM
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH METRIC:
- 45.60 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit Yamaha YZ80 1985-1987 49.5mm 520M04950
WISECO
$144.95The Wiseco 520M04950 is a complete piston kit engineered for the Yamaha YZ80, delivering the precision and durability you need to keep your machine running strong lap after lap. A quality piston kit...520M04950- SKU:
- 520M04950
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +1,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 49.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 45.60 MM
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH:
- 45,60 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco Piston Standard Yamaha IT 200 1984 522M06600
WISECO
$184.95When your Yamaha IT200's original piston shows wear, combustion efficiency drops and power delivery suffers. The Wiseco 522M06600 restores—and exceeds—stock performance with forged aluminum...522M06600- SKU:
- 522M06600
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 195 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STROKE LENGTH:
- 57,00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 66.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.00 MM
$184.95 -
Wiseco Piston Kit 67.00mm Oversize Yamaha IT200 1984-1986 522M06700
WISECO
$193.95If you're running a 1984-1986 Yamaha IT200, a worn or damaged piston directly impacts throttle response, power delivery, and engine reliability. The Wiseco 522M06700 restores—and exceeds—OEM...522M06700- SKU:
- 522M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 57.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 195 CC
- STROKE LENGTH:
- 57,00 MM
$193.95 -
Wiseco Piston 2.00mm Oversize Yamaha YZ80 1980 508M05000
WISECO
$144.95When you're pushing a YZ80 to its limits on the track or trail, factory pistons won't cut it. The Wiseco 508M05000 is precision-engineered for 2-stroke performance, delivering the compression...508M05000- SKU:
- 508M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 45.60 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 45,60 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 50.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 82 CC
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco PE175 1980-1984 Piston Kit 490M06200
WISECO
$154.95If you're running a 1980–1984 Suzuki PE175, a worn piston kit will tank your engine's compression, throttle response, and overall reliability. The Wiseco 490M06200 delivers a complete,...490M06200- SKU:
- 490M06200
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 62.00 MM
- DISPLACEMENT:
- 172 CC
- PISTON DIAMETER METRIC:
- 61.92 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 57.00 MM
- UNITS:
- KIT
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit Standard Bore 66mm Kawasaki KDX 200 1986-2006 711M06600
WISECO
$199.95If your Kawasaki KDX200 is losing compression, burning oil, or showing signs of worn ring wear, a piston kit refresh is essential to restore power delivery and engine reliability. Wiseco's 711M06600...711M06600- SKU:
- 711M06600
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 58,00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 198 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 58.00 MM
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 66.50mm Oversize Kawasaki KDX200 1986-1988 711M06650
WISECO
$199.95The Wiseco 711M06650 is engineered for riders who demand precision and reliability from their 2-stroke engine. If you're rebuilding a KDX200 or pushing for better throttle response and peak power,...711M06650- SKU:
- 711M06650
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 58,00 MM
- STROKE LENGTH METRIC:
- 58.00 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 66.50 MM
- DISPLACEMENT:
- 198 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$199.95 -
Wiseco Piston 1986 Kawasaki KDX 200 711M06700
WISECO
$184.95If you're running a 1986 Kawasaki KDX 200, piston wear directly impacts compression, throttle response, and top-end reliability—especially on a 2-stroke where every combustion cycle matters. The...711M06700- SKU:
- 711M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 58,00 MM
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 198 CC
- STROKE LENGTH METRIC:
- 58.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Piston Kit 67.50mm for 1996-1999 KTM 250 SX 694M06750
WISECO
$199.95If you're running a 1996-1999 KTM 250 SX at the edge of its limits, a worn or damaged piston directly translates to lost compression, power, and reliability. The Wiseco 694M06750 replaces all...694M06750- SKU:
- 694M06750
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON
- DISPLACEMENT:
- 249,6 CC
- STROKE LENGTH:
- 69,50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 69.50 MM
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit Standard 66.40mm Bore Honda CR250R 1997-2001 702M06640
WISECO
$221.95If you're running a CR250R at the track or on the trail, piston durability and consistent power delivery directly impact your lap times and engine longevity. Wiseco's forged high-silicon aluminum...702M06640- SKU:
- 702M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
$221.95 -
Wiseco Piston Kit 67.50mm for Honda CR250R 2002-2004 702M06750
WISECO
$221.95When you're pushing your CR250R to the limit, a stock piston won't cut it. The Wiseco 67.50mm piston kit delivers the precision engineering and durability you need to maintain peak performance lap...702M06700- SKU:
- 702M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 67.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,60 MM
- BORE - OVERSIZE METRIC:
- +0.60 MM
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- RIDING STYLE:
- OFF-ROAD
$221.95Qty in Cart: 0Quantity:Price:$221.95Subtotal:
