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
-
VERTEX Piston Kit - Standard 22983B
VERTEX
$242.95If you're building or rebuilding an engine that demands reliability under sustained high RPM and load, OEM pistons often can't keep pace. The VERTEX Piston Kit 22983B delivers the durability and...09101043- SKU:
- 09101043
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
$242.95 -
Wiseco Piston Kit for Honda CR250M 1975-1976 338M07000
WISECO
$199.95If you're running a 1975-1976 Honda CR250M, the stock piston won't survive sustained high-RPM riding or aggressive tuning. The Wiseco 338M07000 replaces worn or damaged pistons with OEM-spec geometry...338M07000- SKU:
- 338M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- UTV
- DISPLACEMENT:
- 248 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 64.40 MM
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 2mm Oversize for 1975-1977 Honda CR250M 338M07200
WISECO
$224.95When your two-stroke demands more displacement and sustained power, a quality piston kit is non-negotiable. The Wiseco 338M07200 delivers the precision engineering and material science needed to...338M07200- SKU:
- 338M07200
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 248 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- UTV
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 71.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 72.00 MM
- STROKE LENGTH METRIC:
- 64.40 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit 78mm 14.5:1 Compression Gas Gas EX 250F 2022 RE804M07800
WISECO
$377.95When you're pushing your Gas Gas EX 250F to its limits, a stock piston simply won't cut it. The Wiseco RE804M07800 delivers the precision engineering and durability you need to maximize power output...09105073- SKU:
- 09105073
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
$377.95Qty in Cart: 0Quantity:Price:$377.95Subtotal: -
Wiseco 2-Stroke Piston Kit 47.5mm Honda CR85R 2003-2007 RE921M04750
WISECO
$159.95If you're running a CR85R hard, piston wear is inevitable—and factory replacements won't keep pace with aggressive riding or modified engines. The Wiseco RE921M04750 delivers the durability and...09105077- SKU:
- 09105077
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.50 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
$159.95Qty in Cart: 0Quantity:Price:$159.95Subtotal: -
Wiseco Piston Kit 80mm 10.5:1 Compression for Suzuki DR350 1990-1999 4576M08000
WISECO
$174.95If you're running a Suzuki DR350 and want measurable gains in power and reliability, a high-compression piston kit is one of the most direct upgrades available. The Wiseco 4576M08000 raises your...4576M08000- SKU:
- 4576M08000
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PISTON DIAMETER METRIC:
- 79.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 80.00 MM
- DISPLACEMENT:
- 349 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 71.20 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit 2.00mm Oversize 52.95mm Yamaha YZ80 1976-1980 457M05100
WISECO
$144.95If you're rebuilding a YZ80 or chasing consistent power delivery on the track, a worn piston directly impacts compression, throttle response, and overall engine reliability. The Wiseco 457M05100...457M05100- SKU:
- 457M05100
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 50.95 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 42.00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 51.00 MM
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco Piston Kit 49.50mm Honda CR85R 2003-2006 PK1217
WISECO
$197.95When a 2-stroke top-end fails, you need a piston kit engineered to restore—or exceed—stock performance. The Wiseco PK1217 delivers the precision bore and aerospace-grade materials that serious riders...09030175- SKU:
- 09030175
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- DISPLACEMENT:
- 84.7 CC
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 49.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 49.45 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
$197.95Qty in Cart: 0Quantity:Price:$197.95Subtotal: -
Wiseco YZ125 2001 Piston Kit with Gaskets 56mm PK1351
WISECO
$234.95When your YZ125's original piston is worn or damaged, you're looking at lost compression, reduced power delivery, and potential engine damage if you don't address it quickly. The Wiseco PK1351...09030176- SKU:
- 09030176
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$234.95Qty in Cart: 0Quantity:Price:$234.95Subtotal: -
Wiseco Honda XR200R 1992-2002 Piston Kit with Gaskets PK1124
WISECO
$204.95If you're rebuilding your XR200R's top end, the Wiseco PK1124 delivers the precision and durability you need to extract reliable power from your engine. The forged aluminum construction and 10.25:1...09030212- SKU:
- 09030212
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 192 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON DIAMETER METRIC:
- 65.45 MM
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 65.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Piston Kit with Gaskets for Honda XR250R 1986-2004 73.50mm 10.5:1 PK1220
WISECO
$257.95When your Honda XR250R's original piston shows wear or you're rebuilding after hard trail use, this Wiseco kit delivers the precision and durability needed to restore—or exceed—factory performance...09030216- SKU:
- 09030216
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 73.45 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 59.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 73.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$257.95 -
Wiseco Piston Kit 54mm Honda XR100R 1985-1991 PK1274
WISECO
$184.95If you're rebuilding your Honda XR100R's top end, a quality piston kit is non-negotiable—it's the foundation of reliable power delivery and engine longevity. The Wiseco PK1274 delivers OEM-level...09030242- SKU:
- 09030242
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- DISPLACEMENT:
- 99.2 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 54.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.4:1
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 45.00 MM
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 53.97 MM
- PISTON SIZE METRIC:
- +2.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Suzuki RM85 2002-2023 Piston Kit with Gaskets PK1210
WISECO
$214.95The Wiseco PK1210 is engineered to restore your RM85's original performance or push it beyond stock capability with precision-forged components that withstand the demands of competitive motocross...09030294- SKU:
- 09030294
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 52.00 MM
- MODEL:
- RACER'S CHOICE
- STROKE LENGTH METRIC:
- 46.80 MM
- TYPE:
- TOP END
- DISPLACEMENT:
- 99,4 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +5.00 MM
- COOLING SYSTEM:
- LIQUID COOLED
- BORE - OVERSIZE:
- +5,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
$214.95Qty in Cart: 0Quantity:Price:$214.95Subtotal: -
Wiseco Piston Kit +1.50 mm Yamaha YZ 250 2002-2024 560M06950
WISECO
$224.95If you're running a YZ250 2-stroke at the limit, factory pistons won't cut it. The Wiseco 560M06950 delivers the precision bore diameter and durable aluminum construction needed to handle competitive...560M06950- SKU:
- 560M06950
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +1.50 MM
- STROKE LENGTH METRIC:
- 68.00 MM
- BORE SIZE METRIC:
- 69.50 MM
- DISPLACEMENT:
- 246,8 CC
- BORE - OVERSIZE:
- +1,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 68,00 MM
- UNITS:
- EACH
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Standard Honda CR125R 2000 564M05400
WISECO
$162.95When your CR125R's piston reaches the end of its service life, a quality replacement directly impacts engine reliability, throttle response, and race-day consistency. The Wiseco 564M05400 delivers...564M05400- SKU:
- 564M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 54.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 125 CC
- STROKE LENGTH:
- 54,50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
$162.95 -
Wiseco Piston 54mm Oversize for Suzuki RM 125 1985-1986 519M05400
WISECO
$154.95When you're pushing a RM 125 to its limits, a worn or stock piston becomes your bottleneck—losing power, wasting fuel, and risking catastrophic engine failure. The Wiseco 519M05500 delivers the...519M05500- SKU:
- 519M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 54,00 MM
- STROKE LENGTH METRIC:
- 54.00 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 51.00 mm Yamaha YZ 80 1976-1980 457M05100
WISECO
$152.95If you're running a YZ 80 and want genuine performance gains, a quality piston kit is where it starts. The Wiseco 520M05000 delivers measurable improvements in throttle response and engine...520M05000- SKU:
- 520M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 45,60 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 50.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.60 MM
- DISPLACEMENT:
- 82 CC
- BORE - OVERSIZE METRIC:
- +2.00 MM
- RIDING STYLE:
- OFF-ROAD
$152.95Qty in Cart: 0Quantity:Price:$152.95Subtotal: -
Wiseco Piston Standard KTM 300 EXC 2025 712M07200
WISECO
$243.95When your KTM 300 EXC's piston and rings wear down, combustion efficiency drops—along with your power delivery and throttle response. The Wiseco 712M07200 restores full engine performance with...712M07200- SKU:
- 712M07200
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 73,00 MM
- STROKE LENGTH METRIC:
- 73.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 72.00 MM
- DISPLACEMENT:
- 297 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
$243.95 -
Wiseco Piston Standard Yamaha YZ125 2005-2021 693M05400
WISECO
$154.95When your YZ125's factory piston wears out or you're looking to restore lost compression, the Wiseco 693M05400 delivers the precision and durability you need to maintain peak performance. This...693M05400- SKU:
- 693M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 124 CC
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit with Gasket for KTM 300 EXC 2008-2016 PK1870
WISECO
$302.95A worn top end kills power and reliability—the Wiseco PK1870 restores both. This complete piston kit delivers the precision engineering your KTM 300 EXC demands, whether you're rebuilding after a...09031164- SKU:
- 09031164
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- DISPLACEMENT:
- 297 CC
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 73.00 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 71.94 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$302.95
