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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MOOSE RACING Clutch Cylinder Guard - Gas Gas/KTM/Husqvarna 13-1223
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable to impact and chain strikes—damage means downtime and expensive repairs. This CNC-machined guard absorbs hits that would otherwise compromise your clutch...09500994- SKU:
- 09500994
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$42.95 -
MOOSE RACING Ignition Wire Guard - Sherco 27-9013
MOOSE RACING
$29.95Debris catching on exposed ignition wires is a common cause of misfires and electrical gremlins that can sideline your bike mid-race or trail ride. This MOOSE RACING Ignition Wire Guard shields the...09500995- SKU:
- 09500995
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$29.95 -
MOOSE RACING Clutch Cover - Kawasaki D70-2474MB
MOOSE RACING
$179.95Your OEM clutch cover is a thermal bottleneck—heat buildup directly compromises clutch engagement and longevity. The MOOSE RACING clutch cover replaces this weak point with aircraft-grade aluminum...09402037- SKU:
- 09402037
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$179.95 -
MOOSE RACING Clutch Cylinder Guard - Gas Gas/KTM/Husqvarna 13-1023
MOOSE RACING
$42.95Your hydraulic clutch cylinder is exposed to constant impact and debris on the trail—one hard crash or chain slap can leave you stranded. The MOOSE RACING Clutch Cylinder Guard shields this critical...09500992- SKU:
- 09500992
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$42.95 -
On Sale
Pro Circuit Water Pump Cover with Impeller for Kawasaki KX250 2021-2024 WPK21250
PRO CIRCUIT
MSRP: $239.95Now: $215.96Was: $239.95Keep your KX250's cooling system operating at peak efficiency with a precision-engineered water pump cover that delivers measurable gains in water flow and thermal management. Factory pump covers...09402061- SKU:
- 09402061
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
MSRP: $239.95Now: $215.96Was: $239.95 -
On Sale
VINTCO Crankshaft Assembly - Honda CR2012
VINTCO
MSRP: $423.95Now: $394.27Was: $423.95A crankshaft is the backbone of your engine's reliability—this VINTCO assembly delivers the durability and precision required for consistent performance under sustained load. If you're rebuilding,...09210926- SKU:
- 09210926
- Availability:
- Ships Same Business Day
- Weight:
- 11.00 LBS
MSRP: $423.95Now: $394.27Was: $423.95 -
On Sale
VINTCO Crankshaft Assembly - Honda CR2013
VINTCO
MSRP: $423.95Now: $394.27Was: $423.95A failing or worn crankshaft compromises engine reliability and power delivery—replacing it with a precision-engineered assembly restores the structural integrity your Honda needs for consistent...09210927- SKU:
- 09210927
- Availability:
- Ships Same Business Day
- Weight:
- 10.93 LBS
MSRP: $423.95Now: $394.27Was: $423.95 -
On Sale
VINTCO Crankshaft Assembly - Kawasaki CR2015
VINTCO
MSRP: $416.95Now: $387.76Was: $416.95A crankshaft assembly is the backbone of your engine's reciprocating motion—it converts combustion force into rotational power that drives your wheels. The VINTCO CR2015 pairs precision engineering...09210928- SKU:
- 09210928
- Availability:
- Ships Same Business Day
- Weight:
- 10.73 LBS
MSRP: $416.95Now: $387.76Was: $416.95 -
On Sale
VINTCO Crankshaft Assembly - Maico CR2011
VINTCO
MSRP: $416.95Now: $387.76Was: $416.95A quality crankshaft assembly is the foundation of engine reliability and power delivery—especially in high-stress racing applications where failure isn't an option. The VINTCO CR2011 combines...09210925- SKU:
- 09210925
- Availability:
- Ships Same Business Day
- Weight:
- 11.96 LBS
MSRP: $416.95Now: $387.76Was: $416.95 -
JE PISTONS Piston Kit 362954
JE PISTONS
$314.99Building a high-revving engine demands pistons engineered for the abuse that competition delivers. JE's 362954 kit combines precision forging with meticulous design to handle extreme boost, nitrous,...09106544- SKU:
- 09106544
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$314.99 -
JE PISTONS Piston Kit 373034
JE PISTONS
$389.99If you're building an engine for competition or extreme duty applications, piston quality directly impacts reliability and performance under peak loads. The JE PISTONS 373034 Kit delivers the...09106551- SKU:
- 09106551
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$389.99 -
JE PISTONS Piston Kit 373035
JE PISTONS
$409.99When you're pushing your engine to the limit in competition, stock pistons won't cut it. The JE Piston Kit 373035 is purpose-built for extreme applications where reliability and performance are...09106552- SKU:
- 09106552
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
$409.99 -
MOOSE RACING Piston Kit - 78.00 mm - Honda MP2000C
MOOSE RACING
$326.95If you're pushing your Honda MP2000C to its limits, stock pistons become your weak point. The MOOSE RACING Piston Kit delivers the strength and precision you need to run aggressive boost levels and...09106465- SKU:
- 09106465
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$326.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MP2009
MOOSE RACING
$326.95High-performance pistons are critical to engine reliability under extreme conditions—cheap alternatives fail catastrophically. The MOOSE RACING Piston Kit delivers the strength and precision...09106466- SKU:
- 09106466
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$326.95 -
MOOSE RACING Piston Kit - 66.00 mm - Honda MP2044C
MOOSE RACING
$326.95A quality piston kit is fundamental to engine reliability and performance—especially in high-demand racing applications where detonation and premature wear can cost you races. The MOOSE RACING...09106468- SKU:
- 09106468
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
$326.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MP4027
MOOSE RACING
$326.95A high-performance piston kit is critical for maintaining reliability and power output in demanding riding conditions. The MOOSE RACING MP4027 combines forged durability with precision engineering to...09106476- SKU:
- 09106476
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
$326.95 -
MOOSE RACING Piston Kit - 95.00 mm - Yamaha MP1000
MOOSE RACING
$326.95A piston kit is the heart of your engine's combustion cycle—when it wears, power drops and reliability suffers. The MOOSE Racing 95.00 mm Piston Kit for Yamaha MP1000 engines combines forged strength...09106477- SKU:
- 09106477
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
$326.95 -
MOOSE RACING Piston Kit - 95.00 mm - Yamaha MPX1026
MOOSE RACING
$386.95When you're pushing your Yamaha to the limit, stock pistons become a liability. The MOOSE RACING Piston Kit delivers the strength, durability, and reduced friction you need to safely extract peak...09106488- SKU:
- 09106488
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$386.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2082
MOOSE RACING
$386.95Stock Honda pistons aren't engineered to handle sustained high-RPM loads or aggressive tuning—they'll degrade combustion efficiency and risk catastrophic failure. The MOOSE RACING MPX2082 piston kit...09106518- SKU:
- 09106518
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2083A-P
MOOSE RACING
$516.95If you're running a high-rpm Honda engine, piston durability under extreme conditions separates a reliable build from a catastrophic failure. The MOOSE RACING Piston Kit is engineered to handle...09106519- SKU:
- 09106519
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$516.95
