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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LA Sleeve Cylinder Sleeve for Suzuki RMX250 1993-1998 FL5271
LA SLEEVE
$153.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5271, designed for optimal performance and durability. This high-quality replacement sleeve ensures a perfect fit and restores...FL5271- SKU:
- FL5271
- Availability:
- Ships Same Business Day
- Weight:
- 1.32 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 67.00 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
$153.95 -
LA Sleeve Cylinder Sleeve for Honda XR400R 1996-2004 H5293
LA SLEEVE
$111.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5293, designed to restore performance and extend the lifespan of your cylinders. Crafted from high-quality materials, these sleeves provide...H5293- SKU:
- H5293
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RS
- BORE SIZE METRIC:
- 85.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$111.95 -
LA Sleeve Cylinder Sleeve 72mm Bore Polaris Trail Blazer 250 1990-2006 FL5168
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5168, designed to restore performance and extend the lifespan of your old cylinders. Crafted with precision, these high-quality replacement...FL5168- SKU:
- FL5168
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- COLOR/FINISH:
- ALUMINUM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- CI
- BORE SIZE METRIC:
- 72.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$148.95 -
LA Sleeve Big Bore Cylinder Sleeve for Honda TRX400EX 1999-2008 H5445
LA SLEEVE
$117.95If your TRX400EX is showing signs of cylinder wear—loss of compression, blow-by, or hard starting—a sleeve replacement restores factory performance without the cost of a full engine rebuild. The LA...09310054- SKU:
- 09310054
- Availability:
- Ships Same Business Day
- Weight:
- 1.86 LBS
- BORE SIZE METRIC:
- 88.00 MM
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- BIG BORE
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$117.95 -
On Sale
KIBBLEWHITE Intake Valve - Titanium - KTM 96-96412T
KIBBLEWHITE
MSRP: $109.33Now: $98.40Was: $109.33Titanium intake valves are essential for high-RPM engines where thermal expansion and weight savings directly impact performance and reliability. The Kibblewhite Tensilite® design reduces inertial...09262706- SKU:
- 09262706
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 32.51 MM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STEM DIAMETER IMPERIAL:
- 0.1960'
- TULIP ANGLE:
- 15°
MSRP: $109.33Now: $98.40Was: $109.33 -
On Sale
KIBBLEWHITE Intake Valve 80-8055H
KIBBLEWHITE
MSRP: $54.10Now: $48.69Was: $54.10Intake valves are critical to engine reliability and performance—they're the gateway to your combustion chamber, and any weakness here translates to lost horsepower and potential catastrophic failure...KW808055H- SKU:
- KW808055H
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- STEM DIAMETER IMPERIAL:
- 0.1765'
- HEAD DIAMETER METRIC:
- 27.00 MM
- LENGTH IMPERIAL:
- 3.320'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 15°
MSRP: $54.10Now: $48.69Was: $54.10 -
On Sale
KIBBLEWHITE Intake Valve Guide 30-30930
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $15.92Valve guides are critical to controlling oil consumption and maintaining precise valve seat alignment under extreme combustion pressures. A worn or damaged guide compromises engine sealing, increases...09260412- SKU:
- 09260412
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4360'
- SIZE IMPERIAL:
- STANDARD
MSRP: $15.92Now: $14.33Was: $15.92 -
On Sale
KIBBLEWHITE Exhaust Valve 30-3117
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Exhaust valves endure extreme heat cycles and aggressive combustion pressures—factory originals often become the weak link in high-performance builds. The KIBBLEWHITE Black Diamond™ Exhaust Valve...KW303117- SKU:
- KW303117
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MODEL:
- BLACK DIAMOND™
- TULIP ANGLE:
- 29°
- LENGTH IMPERIAL:
- 3.980'
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 29.00 MM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2150'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Cast Iron Valve Seat 10-SC280
KIBBLEWHITE
MSRP: $8.12Now: $7.31Was: $8.12Valve seat recession is one of the fastest ways to lose compression and combustion efficiency in high-performance engines—especially when running aggressive fuel blends or boost. KIBBLEWHITE's Cast...09261630- SKU:
- 09261630
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- VALVE SEAT HEIGHT METRIC:
- 9.50 MM
- HEAD DIAMETER METRIC:
- 28.00 MM
- INSIDE DIAMETER METRIC:
- 20.00 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 28.00 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE SEAT
- UNITS:
- EACH
MSRP: $8.12Now: $7.31Was: $8.12 -
On Sale
KIBBLEWHITE Valve Guide - Intake 96-96520-I
KIBBLEWHITE
MSRP: $22.95Now: $20.66Was: $22.95Valve guides are critical to maintaining proper valve stem clearance and preventing oil seepage into your combustion chamber—a worn guide will compromise both performance and engine longevity. The...09263045- SKU:
- 09263045
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- CAST IRON
- OUTSIDE DIAMETER IMPERIAL:
- 0.4352'
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2353'
- RIDING STYLE:
- OFF-ROAD
MSRP: $22.95Now: $20.66Was: $22.95 -
On Sale
KIBBLEWHITE Intake Valve Guide 80-80110
KIBBLEWHITE
MSRP: $22.29Now: $20.06Was: $22.29Valve guides are critical to engine longevity—they maintain precise valve alignment, prevent wear on valve stems, and directly impact combustion efficiency and port flow. The KIBBLEWHITE 80-80110 is...09263097- SKU:
- 09263097
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- BASE COLOR:
- BROWN
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3957'
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BRONZE
- INSIDE DIAMETER IMPERIAL:
- 0.1765'
- SIZE IMPERIAL:
- STANDARD
MSRP: $22.29Now: $20.06Was: $22.29 -
On Sale
KIBBLEWHITE Exhaust Valve 30-32416
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Exhaust valves are critical components that directly impact engine efficiency, reliability, and longevity. The KIBBLEWHITE Black Diamond™ 30-32416 is engineered to withstand extreme temperatures and...09262983- SKU:
- 09262983
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- HEAD DIAMETER METRIC:
- 25.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MODEL:
- BLACK DIAMOND™
- LENGTH IMPERIAL:
- 3.310'
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1956'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 30-33460
KIBBLEWHITE
MSRP: $403.24Now: $362.92Was: $403.24A complete top-end refresh requires precision components engineered to withstand the demands of high-RPM racing. The KIBBLEWHITE Cylinder Head Service Kit 30-33460 consolidates every critical...09263225- SKU:
- 09263225
- Availability:
- Ships Same Business Day
- Weight:
- 2.71 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- TITANIUM
- SPRING LIFT:
- 0,300'
- MATERIAL:
- C630 BRONZE
- SPRING OPEN PRESSURE:
- 157 LB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.300'
- SPRING SEAT PRESSURE:
- 70 LB
MSRP: $403.24Now: $362.92Was: $403.24 -
On Sale
KIBBLEWHITE Intake Valve - CRF150R - Standard 30-30910
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55OEM valves wear down with hard use, causing compression loss and throttle response lag that compounds over time. The Kibblewhite Black Diamond™ intake valve restores full flow efficiency while...09260298- SKU:
- 09260298
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1765'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- TULIP ANGLE:
- 19°
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 26.00 MM
- LENGTH IMPERIAL:
- 3.065'
- RIDING STYLE:
- OFF-ROAD
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve 40-40412
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $31.01Kibblewhite's Black Diamond™ intake valves are engineered for engines that demand precision and longevity. Built from EV8 stainless steel forgings, these valves deliver reduced friction and...09261649- SKU:
- 09261649
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- UTV
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 30.00 MM
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.600'
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.1960'
- TULIP ANGLE:
- 10°
- UNITS:
- EACH
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 96-96280
KIBBLEWHITE
MSRP: $24.89Now: $22.40Was: $24.89Valve guide wear is one of the most common culprits behind oil consumption, loss of compression, and erratic idle in high-performance engines. The KIBBLEWHITE Exhaust Valve Guide 96-96280 replaces...09261716- SKU:
- 09261716
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.1960'
- MATERIAL:
- C630 BRONZE
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER IMPERIAL:
- 0.3958'
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- OFF-ROAD
MSRP: $24.89Now: $22.40Was: $24.89 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475005
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95A failing water pump gasket can compromise your entire cooling system, leading to overheating, performance loss, and catastrophic engine damage. The ATHENA Water Pump Gasket Kit gives you...09346087- SKU:
- 09346087
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
MSRP: $34.95Now: $31.00Was: $34.95 -
ACERBIS X-Power Cover Kit - Blue - Yamaha 2780680211
ACERBIS
$76.95Crankcase and ignition cover damage can sideline your bike mid-season—dirt ingestion, rock strikes, and UV degradation are real threats to engine longevity. The ACERBIS X-Power Cover Kit shields your...09401894- SKU:
- 09401894
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MATERIAL:
- PLASTIC
- PRODUCT NAME:
- COVER KIT
- MODEL:
- X-POWER
- PRODUCT NAME:
- COVER
- TYPE:
- ENGINE
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$76.95 -
JAGG OIL COOLERS 190 Degree Preset Thermal Switch TS190
JAGG OIL COOLERS
$27.95This bi-metal disc type thermostat installs directly into any 1/8" NPT port and provides an automatic switch to turn on 12V electric fan at the set temperature07130221- SKU:
- 07130221
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- FAN SWITCH
- TYPE:
- AUTOMATIC
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- STYLE:
- 190°F
$27.95 -
JAGG OIL COOLERS Frame Mount Clamp - 1-1/8" CL112
JAGG OIL COOLERS
$9.95Proper oil cooler mounting isn't just about securing a component—it's about protecting your engine from heat damage while keeping vibration from compromising your cooling system's integrity. The JAGG...07130237- SKU:
- 07130237
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- FRAME TUBE CLAMP
- UNITS:
- EACH
- BASE COLOR:
- BLACK
- FOR FRAME TUBE DIAMETER IMPERIAL:
- 1-1/8'
- MATERIAL:
- ALUMINUM
- MOUNTING STYLE:
- BOLT-ON
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
$9.95
