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 Kit Yamaha IT250 1978-1980 71mm Bore 234M07100
WISECO
$210.95The Wiseco 234M07100 piston kit restores or upgrades your Yamaha IT250's top-end with OEM-quality precision and proven durability. Wiseco's forged aluminum construction handles sustained high-RPM running and aggressive 2-stroke conditions without...234M07100- SKU:
- 234M07100
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 71.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 64.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 70.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$210.95 -
Wiseco Piston Kit 88.00mm 12.3:1 Compression 2012-2016 KTM 350 EXC-F 40056M08800
WISECO
$255.95If you're running a 2012-2016 KTM 350 EXC-F and want measurable gains in throttle response and peak power, a high-compression piston upgrade is one of the most effective bolt-on modifications available. The Wiseco 40056M08800 delivers a 12.3:1...09102897- SKU:
- 09102897
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- STROKE LENGTH METRIC:
- 57.50 MM
- BORE SIZE METRIC:
- 88.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.3:1
- DISPLACEMENT:
- 350 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$255.95Qty in Cart: 0Quantity:Price:$255.95Subtotal: -
Wiseco Piston Kit Yamaha DT100 1974-1983 52mm 235M05200
WISECO
$148.95A worn or damaged piston directly undermines engine compression, throttle response, and reliability—especially critical in 2-stroke engines where combustion efficiency is everything. The Wiseco 235M05200 restores lost performance and longevity with a...235M05200- SKU:
- 235M05200
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- DISPLACEMENT:
- 98 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 51.95 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.60 MM
- BORE SIZE METRIC:
- 52.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
Wiseco Piston Kit Yamaha XT500 1976-1981 4045M08700
WISECO
$239.95If you're running an XT500 and want measurable gains in power delivery and engine reliability, the Wiseco 4045M08700 piston kit is the upgrade that separates committed builders from casual riders. A 10:1 compression ratio paired with aerospace-grade...09102899- SKU:
- 09102899
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 84.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 499 CC
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 87.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$239.95 -
Wiseco Piston Kit Standard Bore 66.40mm for Suzuki RM250 1998 723M06640
WISECO
$199.95The Wiseco 723M06640 Pro-Lite Piston Kit delivers the precision and durability your RM250 needs to handle sustained high-RPM operation without compromise. Built from aerospace-grade aluminum and CNC-machined for exact fitment, this kit restores your...723M06640- SKU:
- 723M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Yamaha YZ125 2002-2004 54mm Piston Kit 797M05400
WISECO
$160.95Stock pistons can't handle the demands of aggressive riding—they wear quickly and cost you power when you need it most. The Wiseco 797M05400 Pro-Lite Piston Kit delivers the precision engineering and durable construction required to maximize performance...797M05400- SKU:
- 797M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
$160.95 -
Wiseco Piston Kit 56mm Oversize for Yamaha YZ 125 2005-2020 797M05600
WISECO
$174.95When you're pushing a YZ125 to the limit, your piston kit needs to match your commitment. The Wiseco 797M05600 Pro-Lite delivers the precision fit and lightweight strength that separates consistent lap times from DNFs. Built on racing-proven forging...797M05600- SKU:
- 797M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco 1996-2003 Kawasaki Jet Ski 1100 ZXi 809M08000
WISECO
$149.95The stock piston in your 1996-2003 Kawasaki Jet Ski 1100 ZXi is likely your biggest bottleneck for consistent power delivery and engine longevity. Wiseco's aerospace-grade forged aluminum construction handles the extreme thermal and mechanical demands of...809M08000- SKU:
- 809M08000
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- DISPLACEMENT:
- 743 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 80.00 MM
- DISPLACEMENT:
- 1071 CC
- PRODUCT NAME:
- PISTON
$149.95 -
Wiseco Kawasaki KX250 2002-2004 Crankshaft Kit WPC128A
WISECO
$479.95Your KX250's bottom end is the foundation of reliable power delivery—factory cranks wear out, and a compromised crankshaft kills both performance and engine longevity. The Wiseco WPC128A is a complete, ready-to-install solution that restores your engine...09210108- SKU:
- 09210108
- Availability:
- Ships Same Business Day
- Weight:
- 12.96 LBS
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$479.95Qty in Cart: 0Quantity:Price:$479.95Subtotal: -
Wiseco Suzuki RM125 2004-2008 Crankshaft Kit WPC135
WISECO
$399.95A worn or compromised crankshaft directly limits your RM125's power delivery and reliability—especially under the demands of competitive riding. The Wiseco WPC135 restores your engine to factory precision while delivering the durability upgrades that...09210110- SKU:
- 09210110
- Availability:
- Ships Same Business Day
- Weight:
- 9.43 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
- TYPE:
- BOTTOM END
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$399.95Qty in Cart: 0Quantity:Price:$399.95Subtotal: -
Wiseco Crankshaft Kit for Yamaha WR250F 2003-2013 WPC141
WISECO
$621.95A worn or failing crankshaft compromises engine reliability and performance across the board—power delivery suffers, bearing wear accelerates, and catastrophic failure becomes a real risk. The Wiseco WPC141 kit addresses this with a factory-assembled,...09210111- SKU:
- 09210111
- Availability:
- Ships Same Business Day
- Weight:
- 10.11 LBS
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$621.95 -
Wiseco Crankshaft Kit for 2003-2005 Yamaha YZ 450 F WPC139
WISECO
$624.95A crankshaft is the backbone of any high-performance engine rebuild, and the Wiseco WPC139 is engineered for the demands of serious YZ450F riders. This complete bottom-end kit arrives factory-assembled and precision-trued to OEM specifications,...09210112- SKU:
- 09210112
- Availability:
- Ships Same Business Day
- Weight:
- 11.78 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- STROKE LENGTH METRIC:
- 63.40 MM
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$624.95Qty in Cart: 0Quantity:Price:$624.95Subtotal: -
Wiseco Ring Set 50.50mm Suzuki LT80 1987-2006 Kawasaki KX85 2001-2015 1988CD
WISECO
$52.95Piston ring sets are critical to engine longevity—they seal combustion pressure, manage blowby, and control oil consumption. The Wiseco 1988CD delivers OEM-grade precision at a fraction of replacement engine costs, making it essential maintenance for...1988CD- SKU:
- 1988CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 50.50 MM
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 79,7 CC
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$52.95Qty in Cart: 0Quantity:Price:$52.95Subtotal: -
Wiseco KX100 1995-2013 Ring Set 53mm 2087CD
WISECO
$52.95Piston ring degradation is one of the fastest ways to lose compression, increase blow-by, and watch your engine's power output decline. The Wiseco KX100 Ring Set 2087CD delivers precision-engineered sealing that keeps combustion pressure where it...2087CD- SKU:
- 2087CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- SET
- DISPLACEMENT:
- 99 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 53.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$52.95 -
Wiseco Ring Set 52mm Kawasaki KFX80 2004-2006 Suzuki LT80 QuadSport 1987-2006 Yamaha RD200 1974-1976 Yamaha RT100 1990-2000 2047CD
WISECO
$52.95Piston rings are critical to engine sealing and compression—worn or improper rings will tank your power output and fuel efficiency. The Wiseco 2047CD ring set delivers precision-engineered compression for small-displacement engines, restoring lost...2047CD- SKU:
- 2047CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 52.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- DISPLACEMENT:
- 97 CC
- DISPLACEMENT:
- 98 CC
- RIDING STYLE:
- STREET
- UNITS:
- SET
$52.95 -
Wiseco Piston Ring Set 57.5mm for Yamaha YZ125 1976-1988 2264CS
WISECO
$24.95Your YZ125's combustion chamber relies on precise ring sealing to deliver consistent power and maintain oil control—worn or incorrect rings compromise both. The Wiseco 2264CS ring set is engineered to OEM specifications for your 57.5mm piston, ensuring a...2264CS- SKU:
- 2264CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 57.50 MM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$24.95Qty in Cart: 0Quantity:Price:$24.95Subtotal: -
Wiseco Piston Kit 0.50mm Oversize 10.5:1 Compression Honda XR70R 1997-2003 4880M04750
WISECO
$134.95A worn or stock piston limits your XR70R's potential—restricting power delivery and throttle response when you need it most. The Wiseco 4880M04750 replaces that limitation with a forged-aluminum piston engineered for higher compression and better heat...09100748- SKU:
- 09100748
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- DISPLACEMENT:
- 73 CC
- STROKE LENGTH METRIC:
- 41.40 MM
- BORE SIZE METRIC:
- 47.50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$134.95 -
Wiseco Piston Kit with Gaskets for Honda XR250R 1986-2004 PK1223
WISECO
$297.95The stock piston in your XR250R will eventually wear, lose compression, and cost you performance when you need it most. A quality rebuild with Wiseco's forged-aluminum piston kit restores your engine's original power while improving durability for hard...09030570- SKU:
- 09030570
- Availability:
- Ships Same Business Day
- Weight:
- 1.56 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 59.50 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +4,00 MM
- BORE - OVERSIZE METRIC:
- +4.00 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON DIAMETER METRIC:
- 76.95 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
$297.95Qty in Cart: 0Quantity:Price:$297.95Subtotal: -
Wiseco Piston Kit 58mm 12:1 Compression for Honda CRF100F 2004-2013 4773M05800
WISECO
$169.95If you're rebuilding a CRF100F or pushing your existing engine toward higher output, piston selection directly impacts reliability and power delivery. Wiseco's 12:1 compression ratio opens up meaningful gains in both peak power and throttle response,...09100752- SKU:
- 09100752
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +5,00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- BORE SIZE METRIC:
- 58.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +5.00 MM
- DISPLACEMENT:
- 120 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$169.95Qty in Cart: 0Quantity:Price:$169.95Subtotal: -
Wiseco Piston Kit 75.50mm 10.5:1 Compression Ratio for Honda XR250R 1986-2004 4466M07550
WISECO
$219.95The Wiseco 4466M07550 is engineered to restore or upgrade your XR250R's top-end with a precisely machined piston that maximizes combustion efficiency and power delivery. The 10.5:1 compression ratio extracts measurably more horsepower and torque from...09100753- SKU:
- 09100753
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 75.50 MM
- DISPLACEMENT:
- 250 CC
- BORE - OVERSIZE METRIC:
- +2.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 59.50 MM
- UNITS:
- EACH
$219.95Qty in Cart: 0Quantity:Price:$219.95Subtotal:
