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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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
