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 Cam Chain 2003-2005 Honda CRF150F CC012
WISECO
$66.95A worn or inadequate cam chain can cause timing slippage, reduced valve lift, and premature engine wear—compromising both reliability and performance. The Wiseco CC012 is engineered to eliminate...09250312- SKU:
- 09250312
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- NUMBER OF LINKS:
- 100
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 92RH2005
$66.95 -
WISECO Cam Chain CC013
WISECO
$79.95A worn or failing cam chain compromises valve timing accuracy, leading to performance loss and potential engine damage. The WISECO Cam Chain CC013 delivers the precision and durability needed for...09250313- SKU:
- 09250313
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- PRODUCT NAME:
- CHAIN
- UNITS:
- EACH
- NUMBER OF LINKS:
- 96
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- CHAIN SIZE:
- 92RH2015
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal: -
Wiseco 2-Stroke Piston Ring Set 51.00mm Honda CR80R 1980-1984 2008CD
WISECO
$49.95Piston rings are the seal between your combustion chamber and crankcase—when they wear, compression drops, blow-by increases, and power bleeds away. The Wiseco 2008CD ring set restores that critical...2008CD- SKU:
- 2008CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 51.00 MM
- DISPLACEMENT:
- 79,7 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
Wiseco Ring Set 49mm Kawasaki KX80 1984-2000 1929CD
WISECO
$49.95Piston ring sets are critical to maintaining compression, controlling blow-by, and preventing premature engine wear—especially in high-performance and racing applications where temperatures and...1929CD- SKU:
- 1929CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- UNITS:
- SET
- DISPLACEMENT:
- 82,9 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 49.00 MM
- PRODUCT NAME:
- PISTON RING
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
Wiseco 88mm Ring Set for Suzuki LT500R 1987-1990 3465TD
WISECO
$54.95Restore proper compression and combustion sealing in your Suzuki LT500R with a precision-engineered ring set built to withstand the demands of high-performance riding. Wiseco's 88mm ring set...3465TD- SKU:
- 3465TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 88.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
$54.95Qty in Cart: 0Quantity:Price:$54.95Subtotal: -
Wiseco 87.50mm Ring Set for Suzuki LT500R 1987-1990 Yamaha YZ490 1984-1990 3445TD
WISECO
$54.95Piston ring sets are critical to engine sealing and compression retention—worn or improperly sized rings lead to blow-by, loss of power, and accelerated wear on cylinder walls. The Wiseco 3445TD...3445TD- SKU:
- 3445TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 87.50 MM
- PRODUCT NAME:
- PISTON RING
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- RIDING STYLE:
- ATV
$54.95Qty in Cart: 0Quantity:Price:$54.95Subtotal: -
Wiseco 74mm Piston Ring Set for Honda TRX250X 1987-1988 1991-1992 2913XC
WISECO
$52.95Factory piston rings wear out under racing loads, causing blow-by, power loss, and accelerated engine wear. The Wiseco 2913XC ring set restores proper cylinder sealing and compression, delivering the...2913XC- SKU:
- 2913XC
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- DISPLACEMENT:
- 246 CC
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- DISPLACEMENT:
- 282 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 74.00 MM
$52.95 -
Wiseco Honda CR125R 2005-2007 54mm Piston Kit with Gaskets PK1396
WISECO
$244.95Your CR125R's top end is the heart of its power delivery—a worn or damaged piston compromises combustion efficiency, throttle response, and overall reliability. The Wiseco PK1396 replaces that worn...09030521- SKU:
- 09030521
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 54.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- RACER'S CHOICE
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 125 CC
- STROKE LENGTH METRIC:
- 54.50 MM
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
Wiseco Piston Kit 68.50mm for Honda CR250R 1997-2001 PK1172
WISECO
$297.95When your CR250R's top end reaches the end of its service life, a quality rebuild kit isn't optional—it's essential to maintaining the power and reliability your bike demands. The Wiseco PK1172...09030523- SKU:
- 09030523
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- BORE - OVERSIZE METRIC:
- +2.10 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 68.50 MM
- PISTON DIAMETER METRIC:
- 68.46 MM
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- +2,10 MM
- SKIRT COATING:
- NON-COATED
- DISPLACEMENT:
- 249 CC
$297.95 -
Wiseco Piston Kit Standard 77mm 14.5:1 Compression Kawasaki KX250F 2017-2019 4920M07700
WISECO
$224.95A piston kit is the heart of your engine's combustion chamber—wear or damage here directly kills power output and reliability. The Wiseco 4920M07700 delivers OEM-quality precision with...09100844- SKU:
- 09100844
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 53.60 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit 76mm 12.8:1 Compression for 2006-2012 KTM 250 SX-F 4981M07600
WISECO
$266.95Wiseco's 4981M07600 piston kit delivers the compression ratio and bore precision your KTM 250 SX-F demands for serious trail and motocross performance. The aerospace-grade forged aluminum...09100846- SKU:
- 09100846
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
- BORE SIZE METRIC:
- 76.00 MM
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 249,5 CC
- SKIRT COATING:
- MOLY COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$266.95 -
Wiseco Honda CR85R 2003-2007 Piston Kit with Gaskets 48.50mm PK1216
WISECO
$169.95When your CR85R's top-end starts losing compression and throttle response, a quality rebuild kit is the difference between a seized engine and years of reliable performance. The Wiseco PK1216 gives...09030545- SKU:
- 09030545
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 48.50 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 84.7 CC
- PISTON DIAMETER METRIC:
- 48.45 MM
$169.95Qty in Cart: 0Quantity:Price:$169.95Subtotal: -
Wiseco Piston Kit 78mm 13.5:1 Honda CRF250R 2004-2007 CRF250X 2004-2017 PK1240
WISECO
$362.95If you're running a CRF250R or CRF250X and want measurable gains in power output and engine durability, a quality piston kit is non-negotiable. The Wiseco PK1240 delivers the compression ratio and...09030551- SKU:
- 09030551
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- DISPLACEMENT:
- 249 CC
- BORE SIZE METRIC:
- 78.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 52.20 MM
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 77.95 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$362.95 -
Wiseco Piston Kit Honda CR125R 2004-2007 54mm 841M05400
WISECO
$174.95A worn or damaged piston directly compromises your CR125R's combustion efficiency, throttle response, and overall reliability. The Wiseco 841M05400 GP Series Piston Kit restores these critical...09100731- SKU:
- 09100731
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 54.50 MM
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit with Gaskets for Kawasaki KX450F 2006-2008 PK1403
WISECO
$328.95When your KX450F's top end starts showing wear, a quality piston kit is the foundation of reliable power restoration. Wiseco's PK1403 delivers the precision engineering and durable materials you need...09030575- SKU:
- 09030575
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$328.95 -
Wiseco Piston Kit 96mm 13:1 Kawasaki KX450F 2006-2008 PK1405
WISECO
$349.95The Wiseco PK1405 piston kit delivers measurable performance gains for your KX450F through a 13:1 compression ratio that increases power output without sacrificing fuel efficiency. Whether you're...09030576- SKU:
- 09030576
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 62.10 MM
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- TOP END
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- STANDARD
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$349.95Qty in Cart: 0Quantity:Price:$349.95Subtotal: -
Wiseco Piston Kit Standard Kawasaki KX85 2001-2013 862M04850
WISECO
$134.95The Wiseco 862M04850 Pro-Lite Piston Kit delivers the precision and durability your KX85 needs to handle consistent high-RPM demands. If you're rebuilding after a top-end refresh or pushing your...09100762- SKU:
- 09100762
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 48.50 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 84,9 CC
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 45.80 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit for Yamaha YZ125 2005-2021 846M05600
WISECO
$184.95A worn or stock piston compromises your YZ125's power delivery and reliability when you need it most. The Wiseco 846M05600 Pro-Lite Kit delivers the precision and durability that serious 2-stroke...09100800- SKU:
- 09100800
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 134 CC
- STROKE LENGTH METRIC:
- 54.50 MM
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Piston Kit Suzuki RM80 1991-2001 645M04900
WISECO
$144.95When a 2-stroke piston fails, your ride is over. The Wiseco 645M04900 Pro-Lite delivers the durability and precision engineering that keeps your RM80 running strong through seasons of hard riding...09101222- SKU:
- 09101222
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +1,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 49.00 MM
- DISPLACEMENT:
- 82 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.50 MM
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco Piston Kit Yamaha YZ125 1994-1996 647M05600
WISECO
$179.95A worn or damaged piston directly compromises your YZ125's power delivery, throttle response, and engine reliability—especially critical on 2-stroke engines where piston quality directly impacts...09101224- SKU:
- 09101224
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal:
