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 that resists detonation and thermal stress far better...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 materials engineered to handle the high RPM demands of...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 and extended trail sessions, while precision...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
$207.95Qty in Cart: 0Quantity:Price:$207.95Subtotal: -
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 for maintaining the seal integrity and power delivery...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 failure or upgrading for increased power output, this...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 material quality required to restore—or exceed—your...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 engines demand, whether you're prepping for competition or...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 engineered with forged aluminum construction and precision...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 engineered to OEM specs, ensuring your 2-stroke runs...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 ratio give you the horsepower and torque gains you're...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
$291.95 -
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 high-silicon aluminum with case-hardened construction, this...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 CC005 is engineered to tighter tolerances than stock,...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 fitment and material integrity needed to maintain accurate...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 chain with precision-engineered strength, designed to...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 multiple Yamaha 4-stroke models, ensuring consistent...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 construction that minimizes friction and extends service life,...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. The Wiseco CC011 replaces worn OEM chains with...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 maintains tighter tolerances and resists...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 tighter, lasts longer, and maintains precise valve timing...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 restores proper compression, sealing efficiency, and...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
