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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MOOSE RACING Washer/Snap Ring Counter Shaft 25-6015
MOOSE RACING
$28.95Front sprocket replacement work demands attention to detail—and that starts with having the right fastening components on hand. Countershaft lock-washers and snap rings are critical retention...09350494- SKU:
- 09350494
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SNAP RING
- UNITS:
- 10 PACK
- RIDING STYLE:
- OFF-ROAD
$28.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Kawasaki 25-4013
MOOSE RACING
$23.95A worn countershaft sprocket seal compromises engine reliability and invites oil contamination into your drivetrain. The MOOSE RACING Countershaft Sprocket Seal Kit delivers OEM-quality sealing with...09350440- SKU:
- 09350440
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- COUNTERSHAFT
$23.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Kawasaki 25-4018
MOOSE RACING
$22.95A worn countershaft sprocket seal is a direct path to oil leakage, premature bearing wear, and catastrophic engine failure. This OEM-quality seal kit from MOOSE Racing restores the integrity of your...09350444- SKU:
- 09350444
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$22.95 -
MOOSE RACING Top End Gasket Kit - KTM 300 810306
MOOSE RACING
$32.09When you're rebuilding a KTM 300 top end, using OEM-equivalent gaskets and seals from Moose Racing ensures proper fitment, reliable compression, and a leak-free engine without the OEM price tag. This...M810306- SKU:
- M810306
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$32.09Qty in Cart: 0Quantity:Price:$32.09Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 125 810541
MOOSE RACING
$18.96A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality performance at a fraction...M810541- SKU:
- M810541
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$18.96 -
MOOSE RACING Crank Bearings and Seals - YZ125 24-1062
MOOSE RACING
$78.95A worn crankshaft bearing is one of the fastest ways to turn a healthy 2-stroke into a seized paperweight. The MOOSE RACING Crank Bearings and Seals kit (YZ125 24-1062) replaces both left and right...09240019- SKU:
- 09240019
- Availability:
- Ships Same Business Day
- Weight:
- 0.87 LBS
- TYPE:
- BALL
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$78.95 -
MOOSE RACING Crank Bearing - Yamaha 24-1072
MOOSE RACING
$74.95Crank bearings are the foundation of engine reliability—especially in high-rpm 2-stroke applications where friction and heat demand precision components. MOOSE Racing's 24-1072 kit delivers...09240215- SKU:
- 09240215
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
$74.95 -
MOOSE RACING Crank Bearing - Yamaha 24-1073
MOOSE RACING
$54.95Crank bearing failure is one of the fastest ways to end a riding season—and the MOOSE RACING 24-1073 kit keeps your Yamaha 2-stroke running strong. These precision bearings handle the extreme...09240216- SKU:
- 09240216
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$54.95 -
MOOSE RACING Crank Bearing - KTM 24-1101
MOOSE RACING
$75.95Crankshaft bearing wear is one of the most common failure points in 2-stroke engines, and a failed bearing can leave you stranded mid-race or mid-ride. MOOSE Racing's precision crank bearing kit...09240223- SKU:
- 09240223
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$75.95 -
MOOSE RACING Crank Bearing - KTM 24-1103
MOOSE RACING
$67.95Worn or degraded crankshaft bearings will destroy engine reliability and performance, making replacement essential for any serious 2-stroke rebuild or maintenance routine. MOOSE Racing's...09240225- SKU:
- 09240225
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- APPLICATION:
- CRANKSHAFT
- UNITS:
- KIT
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$67.95 -
MOOSE RACING Crank Bearing - KTM 24-1106
MOOSE RACING
$185.95A compromised crankshaft bearing doesn't just kill performance—it can leave you stranded mid-race or mid-ride. The MOOSE RACING Crank Bearing kit delivers precision tolerances and fluorocarbon-sealed...09240227- SKU:
- 09240227
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- BALL
$185.95 -
MOOSE RACING Gasket Material 403-5015
MOOSE RACING
$46.41Engine gasket failure leads to oil leaks, compression loss, and catastrophic engine damage—all preventable with quality gasket material. MOOSE RACING Gasket Material 403-5015 is engineered for...09346978- SKU:
- 09346978
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- THICKNESS:
- 0,062'
- THICKNESS IMPERIAL:
- 0.062'
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET MATERIAL
- RIDING STYLE:
- OFF-ROAD
$46.41Qty in Cart: 0Quantity:Price:$46.41Subtotal: -
MOOSE RACING Case Saver - CRF150R 0950-0112
MOOSE RACING
$23.95Engine case damage can sideline your CRF150R and drain your wallet fast. The MOOSE RACING Case Saver replaces flimsy OEM plastic guards with precision-engineered aluminum protection that actually...09500112- SKU:
- 09500112
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
$23.95 -
MOOSE RACING Clutch Guard - Cylinder - Husqvarna/KTM 13-1020
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable to chain strikes and debris in high-impact riding conditions—damage here means lost power transfer and a sidelined bike. The MOOSE RACING Clutch Guard...09500963- SKU:
- 09500963
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- SLAVE CYLINDER
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
$42.95 -
MOOSE RACING Clutch Guard - Cylinder - Sherco 13-9219
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable to chain contact and debris on the track—damage here means lost performance and costly downtime. The MOOSE RACING Clutch Guard delivers precision-engineered...09500964- SKU:
- 09500964
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLAVE CYLINDER
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- RIDING STYLE:
- STREET
$42.95Qty in Cart: 0Quantity:Price:$42.95Subtotal: -
MOOSE RACING Case Saver - Honda 0950-0890
MOOSE RACING
$27.95Engine case damage from track debris, crashes, or aggressive riding can sideline your bike and drain your wallet fast. The MOOSE RACING Case Saver replaces fragile OEM plastic guards with...09500890- SKU:
- 09500890
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$27.95 -
MOOSE RACING Clutch Cylinder Guard - KTM 13-116
MOOSE RACING
$42.95If you're running a KTM with a hydraulic clutch system, protecting that cylinder from chain strike and impact damage isn't optional—it's essential maintenance. A compromised clutch cylinder means...09500806- SKU:
- 09500806
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- SLAVE CYLINDER
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$42.95 -
MOOSE RACING Clutch Cylinder Guard - KTM/Husqvarna 13-017
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable pressure points on your KTM or Husqvarna—impact damage means costly downtime and potential loss of clutch control mid-race. The MOOSE RACING Clutch Cylinder...09500807- SKU:
- 09500807
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- TYPE:
- SLAVE CYLINDER
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$42.95 -
MOOSE RACING Case Saver - Yamaha 0950-0812
MOOSE RACING
$38.95Engine case damage from crashes, debris, or track contact can sideline your bike and drain your wallet fast. The MOOSE RACING Case Saver replaces flimsy OEM plastic guards with CNC-machined aluminum...09500812- SKU:
- 09500812
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
- COLOR/FINISH:
- ALUMINUM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$38.95 -
MOOSE RACING Case Saver - KX450F 0950-0518
MOOSE RACING
$27.95Engine case damage from crashes, debris, or track contact can sideline your KX450F and drain your wallet fast. The MOOSE RACING Case Saver replaces flimsy OEM plastic guards with precision-engineered...09500518- SKU:
- 09500518
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- 6061 ALUMINUM
- UNITS:
- EACH
- BASE COLOR:
- SILVER
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- ALUMINUM
$27.95
