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 RM85 2002-2020 PK1209
WISECO
$186.95When your RM85's piston shows signs of wear—loss of compression, increased blow-by, or sluggish throttle response—you need a direct replacement that restores factory performance without compromise...09030214- SKU:
- 09030214
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- DISPLACEMENT:
- 84.7 CC
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 49.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +2,00 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 50.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- STROKE LENGTH METRIC:
- 46.80 MM
$186.95 -
Wiseco YZ125 1998-2000 56mm Piston Kit with Gaskets PK1176
WISECO
$234.95When your YZ125's top end starts showing wear, you need a piston kit that delivers consistent power without compromise. The Wiseco PK1176 combines aerospace-grade forged aluminum with precision CNC...09030215- SKU:
- 09030215
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PISTON DIAMETER METRIC:
- 55.95 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +2,00 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
$234.95Qty in Cart: 0Quantity:Price:$234.95Subtotal: -
Wiseco Honda CR125R 2001-2002 Piston Kit with Gaskets PK1264
WISECO
$244.95Your CR125R's top-end demands precision engineering to handle competitive racing and aggressive trail conditions. The Wiseco PK1264 delivers aerospace-grade forged aluminum construction with...09030217- SKU:
- 09030217
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 125 CC
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
Wiseco Piston Kit with Gaskets for Honda CR250R 1997-2001 PK1169
WISECO
$259.95When your CR250R's top-end starts showing wear, you're losing combustion efficiency and horsepower with every ride. The Wiseco PK1169 restores your engine to factory precision—and then some—with...09030219- SKU:
- 09030219
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,60 MM
- BORE - OVERSIZE METRIC:
- +0.60 MM
- DISPLACEMENT:
- 249 CC
- PISTON DIAMETER METRIC:
- 66.96 MM
- PRODUCT NAME:
- REBUILD KIT
$259.95Qty in Cart: 0Quantity:Price:$259.95Subtotal: -
Wiseco Piston Kit for Kawasaki KX80 1991-1997 49mm PK1302
WISECO
$192.95When your KX80's top-end reaches the end of its service life, a quality piston kit is the foundation of a reliable rebuild. The Wiseco PK1302 delivers OEM-equivalent fitment with aerospace-grade...09030222- SKU:
- 09030222
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 82 CC
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 49.00 MM
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 48.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$192.95 -
Wiseco Piston Kit 48.50mm for Kawasaki KX80 1991-1997 PK1301
WISECO
$179.95Your KX80's performance ceiling is limited by factory piston specs—worn or inadequate pistons rob horsepower, increase blow-by, and accelerate engine wear. The Wiseco PK1301 delivers OEM-plus...09030243- SKU:
- 09030243
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 48.50 MM
- PISTON DIAMETER METRIC:
- 48.45 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 82 CC
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit with Gaskets for 1998-1999 Honda CR125R PK1253
WISECO
$238.95A worn or damaged piston directly kills your CR125R's power delivery and reliability. The Wiseco PK1253 restores—and exceeds—factory performance with precision-forged construction and OEM-spec...09030293- SKU:
- 09030293
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 54.00 MM
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$238.95Qty in Cart: 0Quantity:Price:$238.95Subtotal: -
Wiseco Honda CR125R 1992-1997 Piston Kit with Gaskets PK1164
WISECO
$238.95The stock piston on your CR125R is a compromise between cost and performance—this Wiseco kit eliminates that tradeoff. Whether you're chasing lap times at the track or pushing hard on the trails, a...09030295- SKU:
- 09030295
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- DISPLACEMENT:
- 125 CC
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON DIAMETER METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 54.50 MM
$238.95 -
Wiseco Piston Kit for Suzuki RM250 2003-2008 PK1211
WISECO
$282.95A 2-stroke engine rebuild demands precision components that can handle extreme combustion temperatures and deliver consistent power cycle after cycle. The Wiseco PK1211 is engineered specifically for...09030296- SKU:
- 09030296
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- DISPLACEMENT:
- 249 CC
- PISTON DIAMETER METRIC:
- 66.34 MM
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$282.95 -
Wiseco Piston Kit 54mm for 2002 Yamaha YZ125 PK1191
WISECO
$224.95A worn or damaged piston directly kills your YZ125's power delivery and throttle response—and rebuilding with OEM parts leaves performance on the table. The Wiseco PK1191 gives you a complete,...09030297- SKU:
- 09030297
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 54.00 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$224.95 -
Wiseco Honda CR80R 1992-2002 Piston Kit with Gaskets PK1269
WISECO
$192.95If you're running a Honda CR80R and need reliable top-end performance, a quality piston kit is non-negotiable. The Wiseco PK1269 delivers the precision engineering and durability required for...09030298- SKU:
- 09030298
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- DISPLACEMENT:
- 82.9 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 46.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- KIT
$192.95 -
Wiseco Suzuki RM125 2000-2003 Piston Kit with Gaskets PK1180
WISECO
$219.95When your Suzuki RM125 demands a complete top-end rebuild, you need a piston kit engineered for the demands of competitive 2-stroke racing. The Wiseco PK1180 delivers aerospace-grade durability and...09030300- SKU:
- 09030300
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 124.8 CC
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
$219.95 -
Wiseco 54mm Piston Kit for 2001-2002 Honda CR125R PK1261
WISECO
$233.95When your CR125R's top-end is worn, combustion efficiency drops and horsepower bleeds away. The Wiseco PK1261 restores your engine to peak performance with a precision-engineered piston kit that...09030301- SKU:
- 09030301
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$233.95 -
Wiseco Piston Kit with Gaskets for 2003-2007 Honda CR85R PK1214
WISECO
$181.95When a piston fails or wear becomes noticeable, engine performance drops significantly—and rebuilding with OEM parts often leaves performance on the table. The Wiseco PK1214 delivers a complete,...09030302- SKU:
- 09030302
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 84.7 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$181.95Qty in Cart: 0Quantity:Price:$181.95Subtotal: -
Wiseco Piston Kit with Gaskets for Suzuki RM85 2002-2023 PK1206
WISECO
$186.95If you're rebuilding the top end of your RM85, compromising on piston quality means sacrificing reliability and peak performance when you need it most. The Wiseco PK1206 delivers the precision...09030303- SKU:
- 09030303
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 48.00 MM
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- DISPLACEMENT:
- 84.7 CC
- PISTON DIAMETER METRIC:
- 47.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
$186.95 -
Wiseco Piston Standard Kawasaki KX 80 Big Wheel 1988-1997 539M04800
WISECO
$134.95When your KX80's piston shows signs of wear—loss of compression, increased blowby, or sluggish throttle response—you're losing power and risking catastrophic engine damage. The Wiseco 539M04800...539M04800- SKU:
- 539M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- DISPLACEMENT:
- 82 CC
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STROKE LENGTH:
- 45,80 MM
- STROKE LENGTH METRIC:
- 45.80 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Standard Kawasaki KX 125 1986 540M05600
WISECO
$154.95When your KX 125 engine demands a rebuild, compromising on piston quality means risking power loss and premature wear. The Wiseco 540M05600 delivers the precision fit and lightweight strength that...540M05600- SKU:
- 540M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 50,6 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 50.60 MM
- UNITS:
- EACH
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston 49mm Oversize for Suzuki RM 80 1986-1987 542M04900
WISECO
$144.95If you're running a Suzuki RM80 and demand more power and reliability from your engine, a quality piston upgrade is non-negotiable. The Wiseco 542M04900 delivers the precision bore diameter and...542M04900- SKU:
- 542M04900
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +1,50 MM
- BORE SIZE METRIC:
- 49.00 MM
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH:
- 46,80 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$144.95 -
Wiseco Piston 2.00 mm Oversize Suzuki RM 80 1977-1981 542M04950
WISECO
$144.95When a 2-stroke RM 80 engine reaches its limits, a quality piston replacement is non-negotiable—and the Wiseco 542M04950 delivers the precision engineering your rebuild demands. This forged aluminum...542M04950- SKU:
- 542M04950
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 46.80 MM
- BORE SIZE METRIC:
- 49.50 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 46,80 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- DISPLACEMENT:
- 82 CC
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco Piston Kit 1.00 mm Oversize Yamaha YZ 250 1992-1998 560M06900
WISECO
$199.95If you're running a Yamaha YZ 250 and want measurable gains in power and reliability, a quality piston kit is non-negotiable. The Wiseco 560M06900 delivers the precision engineering and durability...560M06900- SKU:
- 560M06900
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 69.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +1,00 MM
- STROKE LENGTH METRIC:
- 68.00 MM
- DISPLACEMENT:
- 246,8 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 68,00 MM
- UNITS:
- EACH
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal:
