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 56.00 mm Bore Honda CR125R 2004-2007 841M05600
WISECO
$199.95The Honda CR125R demands a piston that can handle the brutal demands of 2-stroke racing—extreme combustion pressures, rapid temperature swings, and relentless RPMs. Wiseco's 841M05600 delivers exactly that: aerospace-grade forged aluminum with precision...09100732- SKU:
- 09100732
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE METRIC:
- 56.00 MM
- MODEL:
- RACER'S CHOICE
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 54.50 MM
$199.95 -
Wiseco Piston Kit Standard 54mm Honda CR125R 2004 840M05400
WISECO
$160.95The 2004 Honda CR125R demands a piston that can handle the demands of modern 2-stroke competition and trail riding. Wiseco's 840M05400 Pro-Lite kit delivers the strength and lightweight characteristics necessary for consistent power delivery and engine...09100733- SKU:
- 09100733
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$160.95 -
Wiseco Honda CRF450X 2005-2017 Piston Kit with Gaskets PK1366
WISECO
$334.95The Wiseco PK1366 is a forged-aluminum piston kit engineered to restore or increase your CRF450X's combustion efficiency and power output. Whether you're running stock boost or preparing for race conditions, this kit delivers the durability and precision...09030574- SKU:
- 09030574
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 95.94 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- TYPE:
- TOP END
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- KIT
$334.95Qty in Cart: 0Quantity:Price:$334.95Subtotal: -
Wiseco Honda XR80 1979-1984 Piston Kit with Gaskets PK1279
WISECO
$179.95When you're pushing a Honda XR80 to its limits, the piston and top-end components are where power is made—or lost. The Wiseco PK1279 delivers a complete top-end solution with aerospace-grade forged aluminum construction and a proven 9.7:1 compression...09030579- SKU:
- 09030579
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 49.00 MM
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +1,50 MM
- COMPRESSION RATIO IMPERIAL:
- 9.7:1
- PISTON DIAMETER METRIC:
- 48.97 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.50 MM
- TYPE:
- TOP END
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 45.00 MM
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit Kawasaki KLX110 2002-2020 53.50mm 11:1 4875M05350
WISECO
$166.95When your KLX110's factory piston starts showing wear, compression drops and power suffers—especially if you're pushing harder on the track or trail. The Wiseco Pro-Lite kit restores lost performance with precision-forged construction that handles...09100764- SKU:
- 09100764
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 50.60 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 112 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 53.50 MM
$166.95 -
Wiseco Piston Kit for Kawasaki KLX110 2002-2025 4875M05400
WISECO
$166.95The stock piston in your KLX110 limits both performance potential and engine durability under aggressive riding. Wiseco's Pro-Lite Piston Kit replaces worn or damaged pistons with a precision-engineered component that delivers better compression...09100765- SKU:
- 09100765
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 112 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 50.60 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
$166.95Qty in Cart: 0Quantity:Price:$166.95Subtotal: -
Wiseco Piston Kit for Kawasaki KLX400R 2004 4795M09450
WISECO
$269.95When your KLX400R is ready to perform beyond stock limitations, the Wiseco 4795M09450 Pro-Lite Piston Kit delivers the precision engineering needed to safely increase compression and unlock additional horsepower. Forged high-silicon aluminum construction...09100768- SKU:
- 09100768
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +4,50 MM
- BORE - OVERSIZE METRIC:
- +4.50 MM
- BORE SIZE METRIC:
- 94.50 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.60 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- DISPLACEMENT:
- 440 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
$269.95Qty in Cart: 0Quantity:Price:$269.95Subtotal: -
Wiseco Piston Kit 96mm 12:1 Compression Kawasaki KX450F 2006-2008 KLX450R 2008-2010 4900M09600
WISECO
$239.95Whether you're pushing your KX450F or KLX450R to the limit on the track or trail, the Wiseco 4900M09600 Pro-Lite Piston Kit delivers the compression ratio and durability needed to extract real power gains without sacrificing reliability. The 12:1...09100769- SKU:
- 09100769
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- DISPLACEMENT:
- 449 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit Standard 200 EXC 1998-2016 770M06400
WISECO
$174.95If you're pushing your KTM 200 EXC hard on the track or trail, piston wear is inevitable—and a worn piston robs you of compression, throttle response, and reliability when you need it most. The Wiseco 770M06400 Pro-Lite Kit delivers a precision-forged...09100773- SKU:
- 09100773
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- DISPLACEMENT:
- 193 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- STROKE LENGTH METRIC:
- 60.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 64.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit 95mm 11:1 Compression KTM 520 EXC 2000-2002 4731M09500
WISECO
$254.95If you're running a KTM 520 EXC and want measurable gains in power and throttle response, a high-compression piston kit is one of the most cost-effective upgrades available. The Wiseco 4731M09500 raises your compression ratio to 11:1, translating to...09100787- SKU:
- 09100787
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 510 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 95.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- FORGED
$254.95 -
Wiseco Piston Kit 95mm 12.5:1 Compression KTM 520 EXC 2000-2002 4732M09500
WISECO
$284.95If you're running a KTM 520 EXC and want measurable gains in power and reliability, a quality piston kit is non-negotiable. The Wiseco 4732M09500 delivers the compression ratio and material engineering to support aggressive riding while maintaining...09100789- SKU:
- 09100789
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 95.00 MM
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- DISPLACEMENT:
- 510 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$284.95Qty in Cart: 0Quantity:Price:$284.95Subtotal: -
Wiseco 97mm Piston Kit for KTM 520 EXC 2000-2002 520 SX 2000-2002 525 EXC 2003-2006 525 SX 2003-2006 525 XC 2008-2010 Polaris Outlaw 525 IRS 2007-2010 4732M09700
WISECO
$284.95When you're pushing your KTM, Polaris, or Beta to the limit, a stock piston becomes your weakest link—especially under sustained high RPM or boost conditions. The Wiseco 4732M09700 Pro-Lite Piston Kit delivers the compression ratio, material science, and...09100790- SKU:
- 09100790
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 510 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 97.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
$284.95 -
Wiseco Piston Kit Standard 95.50mm 12:1 Compression Suzuki RM-Z450 2005-2007 4869M09550
WISECO
$239.95If you're running a 2005-2007 Suzuki RM-Z450 at the edge of its limits, a worn piston compromises both power delivery and engine longevity. The Wiseco 4869M09550 replaces that worn component with a forged, high-silicon aluminum piston designed to handle...09100791- SKU:
- 09100791
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE METRIC:
- 95.50 MM
- DISPLACEMENT:
- 450 CC
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.80 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- MOLY COATED
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit Standard 95.50mm 13:1 Compression Suzuki RM-Z450 2005-2007 4870M09550
WISECO
$269.95The Wiseco 4870M09550 Pro-Lite Piston Kit is engineered for RM-Z450 riders who need reliable performance under demanding conditions. A higher 13:1 compression ratio delivers measurable gains in torque and horsepower, while the forged aluminum...09100793- SKU:
- 09100793
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 62.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 95.50 MM
- DISPLACEMENT:
- 450 CC
- SKIRT COATING:
- MOLY COATED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
$269.95 -
Wiseco Piston Kit Yamaha YZ250F 2001-2004 4858M07700
WISECO
$264.95Stock pistons can't handle the demands of serious riding—thermal stress, detonation, and wear rob you of power and reliability. The Wiseco 4858M07700 Pro-Lite Piston Kit delivers the precision engineering and materials you need to unlock consistent peak...09100806- SKU:
- 09100806
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 263 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 53.60 MM
- BORE SIZE METRIC:
- 77.00 MM
- PISTON MATERIAL:
- FORGED
$264.95Qty in Cart: 0Quantity:Price:$264.95Subtotal: -
Wiseco Piston Kit Kawasaki KX250 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 617M06850
WISECO
$224.95When your KX250 2-stroke demands more power and reliability, the Wiseco 617M06850 Pro-Lite Piston Kit delivers the precision engineering needed to unlock peak performance. CNC-machined from high-silicon aluminum alloy, this kit handles the extreme heat...09101217- SKU:
- 09101217
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 68.50 MM
- PRODUCT NAME:
- PISTON
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.10 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,10 MM
- STROKE LENGTH METRIC:
- 72.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit Suzuki RM125 1989-1999 56.00 mm 641M05600
WISECO
$179.95A worn or damaged piston directly kills your RM125's power output and throttle response. The Wiseco 641M05600 Pro-Lite Kit restores peak compression and reliability, delivering the snap and durability you need whether you're racing competitively or...09101219- SKU:
- 09101219
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit Honda CR80R 1986-2002 49mm 643M04900
WISECO
$155.95If you're rebuilding a Honda CR80R engine or pushing your current one to its limits, the Wiseco 643M04900 Pro-Lite Piston Kit delivers the precision fit and lightweight construction needed for reliable high-RPM performance. This complete kit eliminates...09101221- SKU:
- 09101221
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
- DISPLACEMENT:
- 82,9 CC
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 49.00 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 47.80 MM
$155.95 -
Wiseco Piston Kit with Gaskets 54mm Suzuki RM125 2004-2008 PK1410
WISECO
$264.95A worn-out top end kills power and reliability on the track or trail. The Wiseco PK1410 gives your RM125 a complete refresh with precision-engineered components that restore compression, throttle response, and durability. This all-in-one kit eliminates...09030685- SKU:
- 09030685
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COOLING SYSTEM:
- AIR COOLED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 125 CC
- MODEL:
- RACER'S CHOICE
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
$264.95 -
Wiseco 45mm Piston Kit with Gaskets for 1999-2008 KTM 65 SX PK1514
WISECO
$191.95When your KTM 65 SX top end starts losing compression and power, a quality piston kit isn't optional—it's essential to restore competitive performance and prevent catastrophic engine damage. The Wiseco PK1514 delivers OEM-quality reliability with the...09030701- SKU:
- 09030701
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- DISPLACEMENT:
- 63.58 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 44.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 40.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$191.95
