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 Cylinder - Standard MSECW20014
MOOSE RACING
$390.95A worn or damaged cylinder directly compromises compression, heat management, and overall engine reliability—making replacement essential for consistent performance. The MOOSE RACING Standard Cylinder delivers OEM-spec precision without compromise,...09310969- SKU:
- 09310969
- Availability:
- Ships Same Business Day
- Weight:
- 1.57 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- DISPLACEMENT:
- 450 CC
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER:
- 97,00 MM
- BORE SIZE METRIC:
- STANDARD
- COLOR/FINISH:
- GRAY
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- UNITS:
- EACH
$390.95 -
MOOSE RACING Top End Gasket Kit - YZF/WR250 810671
MOOSE RACING
$59.12When you're rebuilding a YZF/WR250 top end, gasket failure isn't an option. This Moose Racing kit gives you OEM-quality seals and gaskets at a fraction of the cost, with high-tech materials engineered to handle the demands of competition and hard riding...M810671- SKU:
- M810671
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
$59.12 -
MOOSE RACING Top End Gasket Kit - CR250R 810254
MOOSE RACING
$24.85A top-end rebuild demands precision—and cutting corners on gaskets and seals is how engines fail. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, letting you tackle piston replacements and engine refreshes...M810254- SKU:
- M810254
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$24.85 -
MOOSE RACING Connecting Rod MR9713
MOOSE RACING
$476.95If you're building a high-revving engine that demands reliability under extreme conditions, a quality connecting rod is non-negotiable. The MOOSE RACING MR9713, developed in partnership with CP-Carrillo, delivers the precision engineering and material...09230511- SKU:
- 09230511
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PRODUCT NAME:
- CONNECTING ROD
- STYLE:
- HIGH PERFORMANCE
- MATERIAL:
- PROPRIETARY ALLOY
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$476.95 -
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 elements that prevent sprocket drift and ensure your...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 premium materials engineered to withstand high-RPM...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 countershaft assembly with precision-engineered...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 complete gasket kit gives you everything needed for a...M810306- SKU:
- M810306
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$32.09 -
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 of OEM pricing, giving you the confidence to rebuild...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 bearings with precision-matched components, restoring...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 OEM-quality bearings with fluorocarbon seals engineered to...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 rotational loads that stock bearings struggle with, while the...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 delivers the durability and low-friction performance your...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 precision-engineered bearing kit ensures minimal friction losses at...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 design specifically engineered to minimize dry-start...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 precision fitment and reliable sealing across multiple engine...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
$46.41 -
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 withstands impacts, crashes, and the rigors of track or...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 shields this critical component while integrated knockdown...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 protection without adding unnecessary weight or bulk...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
$42.95 -
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 precision-engineered aluminum protection that actually looks the...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
