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!
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Hot Cams Cam Chain for Honda CRF450R 2002-2008 and CRF450X 2005-2017 HC92RH2015112
HOT CAMS
$57.95The cam chain is a critical component that directly impacts your CRF450's reliability and engine longevity. Over time, OEM chains wear and stretch, causing timing issues and potential catastrophic engine damage. The HOT CAMS HC92RH2015112 delivers a...09250756- SKU:
- 09250756
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 92RH2015
- PRODUCT NAME:
- CHAIN
- BASE FINISH:
- RAW
- COLOR/FINISH:
- RAW
- UNITS:
- EACH
- MODEL:
- SILENT
- TYPE:
- CAM
$57.95 -
HOT CAMS Cam Chain HC82RH2010128
HOT CAMS
$97.95A failing cam chain doesn't just compromise performance—it threatens catastrophic engine damage. The HOT CAMS HC82RH2010128 silent chain delivers the reliability of OEM specifications with engineering that exceeds factory tolerances, keeping your valve...09250755- SKU:
- 09250755
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- OFF-ROAD
- BASE FINISH:
- RAW
- CHAIN SIZE:
- 82RH2010
- COLOR/FINISH:
- RAW
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MATERIAL:
- STEEL
- MODEL:
- SILENT
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
$97.95 -
Hot Cams Exhaust Camshaft for Kawasaki KX250F 2004-2010 2068-2E
HOT CAMS
$294.95If you're running a KX250F and serious about extracting maximum performance from your engine, the Hot Cams 2068-2E Exhaust Camshaft is essential. This Stage 1/Stage 2 design delivers measurable gains in throttle response and mid-range torque while...09250149- SKU:
- 09250149
- Availability:
- Ships Same Business Day
- Weight:
- 1.12 LBS
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 248°
- UNITS:
- EACH
- EXHAUST LIFT METRIC:
- 8.25 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
$294.95 -
Hot Cams Stage 2 Intake Camshaft for Kawasaki KX250F 2004-2010 2067-2IN
HOT CAMS
$294.95The Hot Cams Stage 2 intake camshaft is engineered to unlock peak horsepower across your KX250F's RPM range, delivering the high-speed performance gains serious racers demand. If you're running stock cams, you're leaving power on the table—this Stage 2...09250148- SKU:
- 09250148
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
- TYPE:
- STAGE 2
- APPLICATION:
- INTAKE
- INTAKE DURATION IMPERIAL:
- 258°
- INTAKE LIFT METRIC:
- 9.14 MM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CAMSHAFT
$294.95 -
Hot Cams Stage 3 Camshaft for Honda TRX400EX 1999-2008 1051-3
HOT CAMS
$383.95The HOT CAMS Stage 3 Camshaft transforms your TRX400EX into a focused racing machine by delivering aggressive valve timing that maximizes both low-end torque and top-end horsepower. Stock camshafts compromise across the RPM band—this one doesn't. Drop it...09250083- SKU:
- 09250083
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- EXHAUST LIFT METRIC:
- 9.00 MM
- INTAKE DURATION IMPERIAL:
- 262°
- INTAKE LIFT METRIC:
- 9.10 MM
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- EXHAUST DURATION IMPERIAL:
- 257°
- APPLICATION:
- EXHAUST
- TYPE:
- STAGE 3
$383.95 -
Hot Cams Stage 2 Camshaft for Honda CRF250R 2004-2009 1139-2
HOT CAMS
$415.95If you're running a CRF250R in competition or looking to unlock measurable performance gains on the track, camshaft selection directly impacts your power delivery and throttle response. The Hot Cams Stage 2 delivers a measurable bump in peak horsepower...09250082- SKU:
- 09250082
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- EXHAUST LIFT METRIC:
- 8.35 MM
- PRODUCT NAME:
- CAMSHAFT
- INTAKE LIFT METRIC:
- 8.40 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- EXHAUST DURATION IMPERIAL:
- 267°
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- INTAKE DURATION IMPERIAL:
- 252°
- TYPE:
- STAGE 2
$415.95 -
Wossner Top End Bearing for Yamaha YZ125 2005-2022 N1047
WOSSNER
$18.50The top end bearing is critical to maintaining proper crankshaft-to-connecting rod alignment and minimizing friction at peak RPM—neglecting this component leads to catastrophic engine failure. The Wossner N1047 is engineered to OEM tolerances for the...09240461- SKU:
- 09240461
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH METRIC:
- 17.3 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER METRIC:
- 15 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- OUTSIDE DIAMETER METRIC:
- 19 MM
$18.50 -
Wossner Top End Bearing for 1998-2022 KTM 65 SX N1037
WOSSNER
$18.50The top end bearing on your KTM 65 SX takes a beating during aggressive riding and racing—worn bearings lead to increased friction, excessive play, and premature piston wear. Wossner's precision-engineered top end bearing is built to OEM specifications...09240460- SKU:
- 09240460
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- LENGTH METRIC:
- 16.3 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- APPLICATION:
- CONNECTING ROD
- INSIDE DIAMETER METRIC:
- 12 MM
- UNITS:
- EACH
- OUTSIDE DIAMETER METRIC:
- 15 MM
$18.50 -
HOT RODS Crank Bearings K067
HOT RODS
$165.95A crankshaft is only as reliable as the bearings supporting it. The HOT RODS K067 crank bearing kit ensures precise fitment and consistent oil pressure across all main bearing journals, eliminating play that compromises engine stability and longevity...09240234- SKU:
- 09240234
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
$165.95 -
HOT RODS Crank Bearings K066
HOT RODS
$118.95A quality crankshaft is only as reliable as the bearings supporting it. The HOT RODS K066 crank bearing kit delivers precision-engineered main bearing and seal components designed to handle the loads and RPM demands of high-performance engines. Whether...09240233- SKU:
- 09240233
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
$118.95 -
HOT RODS Crank Bearings K065
HOT RODS
$118.95A crankshaft assembly is only as reliable as its bearing system. The HOT RODS K065 Crank Bearings are precision-engineered main bearing and seal kits designed to work seamlessly with HOT RODS crankshaft assemblies, ensuring proper load distribution,...09240232- SKU:
- 09240232
- Availability:
- Ships Same Business Day
- Weight:
- 1.07 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN CRANKSHAFT
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BALL
$118.95 -
HOT RODS Crank Bearings K064
HOT RODS
$83.95A crankshaft is only as reliable as its bearing system. The HOT RODS K064 Crank Bearings deliver the precision fit and load capacity you need to support high-RPM operation without premature wear or catastrophic failure. Whether you're running a freshly...09240231- SKU:
- 09240231
- Availability:
- Ships Same Business Day
- Weight:
- 0.77 LBS
- TYPE:
- BALL
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$83.95 -
HOT RODS Crank Bearings K057
HOT RODS
$107.95A crankshaft is only as reliable as the bearings supporting it. The HOT RODS K057 crank bearing kit delivers the precision tolerances and material integrity required to handle high-RPM loads without premature wear or catastrophic failure. Whether you're...09240213- SKU:
- 09240213
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- KIT
$107.95 -
HOT RODS Crank Bearings K063
HOT RODS
$116.95A crankshaft is only as reliable as its bearings. The HOT RODS K063 crank bearing kit delivers precision-engineered main bearing and seal components that ensure proper load distribution, reduce friction, and maintain critical clearances during high-RPM...09240212- SKU:
- 09240212
- Availability:
- Ships Same Business Day
- Weight:
- 1.64 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$116.95 -
HOT RODS Crank Bearings K022
HOT RODS
$112.95A crankshaft is only as reliable as the bearings that support it. The HOT RODS K022 crank bearing and seal kit ensures proper load distribution, reduces friction, and maintains critical clearances under extreme RPM and boost conditions...09240036- SKU:
- 09240036
- Availability:
- Ships Same Business Day
- Weight:
- 1.57 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- UNITS:
- SET
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$112.95 -
HOT RODS Crank Bearings K021
HOT RODS
$105.95A crankshaft is only as reliable as its bearings. The HOT RODS K021 crank bearing kit delivers the precision tolerances and material quality required to support high-RPM loads without premature wear or failure. Whether you're rebuilding a stock engine or...09240035- SKU:
- 09240035
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- TYPE:
- BALL
- UNITS:
- SET
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$105.95 -
On Sale
ATHENA Connecting Rod Kit P40321029
ATHENA
MSRP: $157.95Now: $142.00Was: $157.95The ATHENA Connecting Rod Kit P40321029 delivers the reliability and precision your engine demands during high-RPM operation. By combining OEM-equivalent materials with advanced high-frequency treatment, these rods reduce critical stress points that...09230498- SKU:
- 09230498
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $157.95Now: $142.00Was: $157.95 -
On Sale
ATHENA Connecting Rod Kit P40321045
ATHENA
MSRP: $184.95Now: $166.00Was: $184.95A connecting rod is the critical link between your piston and crankshaft—and factory components often become a weak point under high-RPM and forced-induction loads. The ATHENA Connecting Rod Kit P40321045 delivers OEM-equivalent material quality with...09230494- SKU:
- 09230494
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- DISPLACEMENT:
- 250 CC
- DISPLACEMENT:
- 520 CC
- DISPLACEMENT:
- 540 CC
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 450 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 400 CC
- DISPLACEMENT:
- 525 CC
MSRP: $184.95Now: $166.00Was: $184.95 -
On Sale
ATHENA Connecting Rod Kit P40321048
ATHENA
MSRP: $121.95Now: $110.00Was: $121.95If you're building or rebuilding an engine that demands reliability at high RPM, the ATHENA Connecting Rod Kit P40321048 delivers the precision engineering and material quality your build deserves. These Japanese-manufactured rods are designed to...09230489- SKU:
- 09230489
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- DISPLACEMENT:
- 150 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
MSRP: $121.95Now: $110.00Was: $121.95 -
On Sale
ATHENA Connecting Rod Kit P40321041
ATHENA
MSRP: $113.95Now: $103.00Was: $113.95Connecting rods are critical stress components in any engine, and factory originals often become a weak link under high RPM or boost conditions. The ATHENA Connecting Rod Kit P40321041 delivers Japanese precision engineering with OEM-matched materials...09230487- SKU:
- 09230487
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- DISPLACEMENT:
- 85 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $113.95Now: $103.00Was: $113.95
