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 1.10mm Oversize for 2001 Honda CR250R 702M06750
WISECO
$199.95When you're pushing your CR250 to the edge, your factory piston becomes the weakest link. The Wiseco 702M06750 is built to handle the demands of high-RPM racing with a high-silicon aluminum forging...702M06750- SKU:
- 702M06750
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 249 CC
- BORE - OVERSIZE:
- +1,10 MM
- BORE - OVERSIZE METRIC:
- +1.10 MM
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
$199.95 -
Wiseco Piston Kit 66.4mm Honda CR250R 2002-2004 802M06640
WISECO
$224.95When your CR250R's piston shows signs of wear or you're rebuilding after a top-end failure, a quality replacement is non-negotiable. The Wiseco 702M06800 delivers OEM-equivalent fitment with...702M06800- SKU:
- 702M06800
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,60 MM
- BORE SIZE METRIC:
- 68.00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +1.60 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit 66.40mm Standard Bore Suzuki RM250 1996-1997 681M06640
WISECO
$207.95The Wiseco 681M06640 is engineered for riders who demand reliability and responsive power from their RM250. Wiseco's forged aluminum construction delivers the durability needed for competitive riding...681M06640- SKU:
- 681M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- DISPLACEMENT:
- 249 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
$207.95 -
Wiseco Piston Kit 48.00mm 0.50mm Oversize for Suzuki RM80 1991-2001 645M04800
WISECO
$134.95The Wiseco 645M04800 is engineered for Suzuki RM80 owners ready to restore lost compression and revive engine responsiveness after thousands of riding hours. A properly sized piston kit is critical...645M04800- SKU:
- 645M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 82 CC
- BORE - OVERSIZE:
- +0,50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 46,80 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit Suzuki RM 80 1989-1990 48.50 mm 579M04850
WISECO
$134.95The Wiseco 645M04850 is a complete piston kit engineered for Suzuki RM80 2-stroke engines, delivering the precision and durability competitive riders demand. If you're rebuilding after a top-end...645M04850- SKU:
- 645M04850
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 48.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- DISPLACEMENT:
- 82 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 46,80 MM
- STROKE LENGTH METRIC:
- 46.80 MM
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit Kawasaki KX60 1983-2003 43mm Standard 648M04300
WISECO
$128.95If you're running a KX60 hard enough to wear out the factory piston, you need a replacement that matches your commitment to performance. Wiseco's 648M04300 kit delivers the precision tolerances and...648M04300- SKU:
- 648M04300
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- BORE SIZE METRIC:
- 43.00 MM
- STROKE LENGTH:
- 41,60 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 60 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 41.60 MM
$128.95 -
Wiseco Piston Kit Kawasaki KX 60 1990-2003 43.5mm Bore 648M04350
WISECO
$119.95If you're running a KX 60 and want to restore or maximize engine performance, a quality piston kit is non-negotiable. Wiseco's 648M04350 delivers the precision fit and durability that 2-stroke...648M04350- SKU:
- 648M04350
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 43.50 MM
- ENGINE TYPE:
- 2-STROKE
- DISPLACEMENT:
- 60 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 41,60 MM
- UNITS:
- EACH
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
Wiseco Piston Standard Yamaha PW 80 1991-2006 649M04700
WISECO
$134.95A 2-stroke piston kit lives a brutal life—extreme temperatures, violent combustion cycles, and constant pressure demand a component that won't fail mid-race or mid-ride. The Wiseco 649M04700 is...649M04700- SKU:
- 649M04700
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 42,00 MM
- STROKE LENGTH METRIC:
- 42.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PRODUCT NAME:
- PISTON
- DISPLACEMENT:
- 72 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit 47.50mm for Yamaha PW80 1991-2006 649M04750
WISECO
$141.95A worn or damaged piston directly kills your PW80's power delivery and reliability. The Wiseco 649M04750 restores full combustion efficiency and throttle response with forged aluminum construction...649M04750- SKU:
- 649M04750
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 47.50 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- STROKE LENGTH METRIC:
- 42.00 MM
- ENGINE TYPE:
- 2-STROKE
- DISPLACEMENT:
- 72 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 42,00 MM
- UNITS:
- EACH
$141.95Qty in Cart: 0Quantity:Price:$141.95Subtotal: -
Wiseco Piston Kit 77mm 13.4:1 Compression for Suzuki RM-Z250 2010-2018 PK1877
WISECO
$291.95When you're rebuilding your RM-Z250's top end, you need a piston kit that delivers repeatable power and reliability without compromise. Wiseco's forged aluminum construction and 13.4:1 compression...09031166- SKU:
- 09031166
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- TOP END
$291.95Qty in Cart: 0Quantity:Price:$291.95Subtotal: -
Wiseco Top End Bearing for Kawasaki KDX175 1980-1981 B1016
WISECO
$25.95The Wiseco B1016 top end bearing is engineered to handle sustained high-RPM performance on your KDX175, delivering the reliability you need when every tenth of a second counts. Built from...B1016- SKU:
- B1016
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- PISTON
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- OUTSIDE DIAMETER METRIC:
- 20 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- SNOW
- INSIDE DIAMETER METRIC:
- 16 MM
- LENGTH METRIC:
- 19.5 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$25.95 -
Wiseco Cam Chain Honda XR600R 1993-2000 CC005
WISECO
$84.95The OEM cam chain on your XR600R is a wear item that directly impacts valve timing accuracy and engine reliability—especially when you're pushing your bike hard or running modified setups. Wiseco's...09250305- SKU:
- 09250305
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- CHAIN SIZE:
- 82RH2010
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
- UNITS:
- EACH
- NUMBER OF LINKS:
- 118
- RIDING STYLE:
- OFF-ROAD
$84.95Qty in Cart: 0Quantity:Price:$84.95Subtotal: -
Wiseco Cam Chain for Honda XR650R 2000-2007 CC006
WISECO
$87.95A worn or compromised cam chain can lead to timing slippage and catastrophic engine damage—especially critical on high-revving machines like the XR650R. The Wiseco CC006 delivers the precision...09250306- SKU:
- 09250306
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- TYPE:
- CAM
- PRODUCT NAME:
- CHAIN
- CHAIN SIZE:
- 92RH2010
- NUMBER OF LINKS:
- 122
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$87.95 -
Wiseco Cam Chain for Kawasaki KX250F 2004-2016 CC007
WISECO
$82.95Stock cam chains wear under the demands of high-performance riding, leading to slack, noise, and potential valve timing issues that rob power and reliability. The Wiseco CC007 replaces that worn...09250307- SKU:
- 09250307
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- TYPE:
- CAM
- CHAIN SIZE:
- 92RH2010
- PRODUCT NAME:
- CHAIN
- NUMBER OF LINKS:
- 114
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$82.95 -
Wiseco Cam Chain for Yamaha YZ400F 1998-1999 YZ426F 2000-2002 WR400F 1998-2000 WR426F 2001-2002 CC008
WISECO
$87.95A worn or stretched cam chain compromises valve timing precision and can lead to catastrophic engine damage if left unchecked. The Wiseco CC008 delivers OEM-exceeding strength and reliability across...09250308- SKU:
- 09250308
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- CHAIN
- CHAIN SIZE:
- 92RH2010
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- NUMBER OF LINKS:
- 120
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$87.95 -
Wiseco Cam Chain for Kawasaki KFX400 2003-2005 and Suzuki DR-Z400S 2000-2022 CC010
WISECO
$92.95A worn or failing cam chain compromises valve timing precision, leading to power loss, rough idle, and potential engine damage. The Wiseco CC010 delivers OEM-exceeding durability with premium...09250310- SKU:
- 09250310
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- CHAIN
- CHAIN SIZE:
- 82RH2010
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- NUMBER OF LINKS:
- 128
- RIDING STYLE:
- STREET
$92.95 -
Wiseco Cam Chain for Suzuki RM-Z450 2005-2020 RMX450Z 2010-2019 CC011
WISECO
$92.95Cam chain wear directly impacts valve timing accuracy and engine reliability—especially critical in high-revving performance engines where timing drift causes power loss and potential valve damage...09250311- SKU:
- 09250311
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- UNITS:
- EACH
- CHAIN SIZE:
- 82RH2010
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- PRODUCT NAME:
- CHAIN
- NUMBER OF LINKS:
- 124
$92.95 -
Wiseco Cam Chain Honda CRF230F 2003-2019 CC014
WISECO
$64.95The stock cam chain on your CRF230F can stretch and wear over time, leading to timing inconsistencies and potential valve damage. The Wiseco CC014 replaces it with a precision-engineered chain that...09250314- SKU:
- 09250314
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- CHAIN SIZE:
- 92RH2005
- NUMBER OF LINKS:
- 104
- RIDING STYLE:
- OFF-ROAD
$64.95Qty in Cart: 0Quantity:Price:$64.95Subtotal: -
Wiseco Cam Chain Yamaha YZ450F 2003-2022 CC015
WISECO
$103.95The stock cam chain on your YZ450F will eventually stretch and wear under the demands of racing and high-RPM riding. Wiseco's CC015 replaces that weak link with a purpose-built chain that runs...09250315- SKU:
- 09250315
- Availability:
- Ships Same Business Day
- Weight:
- 0.48 LBS
- CHAIN SIZE:
- 98XRH2010
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
- NUMBER OF LINKS:
- 118
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$103.95 -
Wiseco Ring Set 66.25mm for Honda CR250R 1981-1985 2608CD
WISECO
$52.95Worn or damaged piston rings directly kill engine performance, allowing combustion pressure to escape past the piston and into the crankcase—a condition called "blow-by." The Wiseco 2608CD Ring Set...2608CD- SKU:
- 2608CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- SNOW
- BORE SIZE METRIC:
- 66.25 MM
- DISPLACEMENT:
- 195 CC
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
$52.95
