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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- Price
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Wossner Piston Ring 68mm for 1992-1998 Yamaha YZ250 RSB6800
WOSSNER
$18.50A worn or damaged piston ring directly compromises compression, fuel efficiency, and power delivery in your YZ250—making replacement critical for both trail and competition use. The Wossner RSB6800 restores factory-spec sealing with precision engineering...09120731- SKU:
- 09120731
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$18.50 -
Wossner Piston Ring 72.50mm for 1999-2006 Polaris 500 Classic RSB7250
WOSSNER
$18.50Worn or damaged piston rings are a direct threat to engine compression, power output, and fuel efficiency—especially critical in 2-stroke engines where ring sealing directly impacts performance. The Wossner RSB7250 is engineered to restore proper...09120736- SKU:
- 09120736
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$18.50 -
Wossner Universal Small End Bearing 16 mm x 20 mm x 19.5 mm N1013
WOSSNER
$18.50Small-end bearing wear is one of the most common failure points in high-performance engine builds, leading to catastrophic rod failure if left unchecked. The Wossner N1013 is a precision needle bearing engineered to handle the extreme radial loads and...09240452- SKU:
- 09240452
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$18.50 -
VERTEX Engine Rebuild Kit - KTM 250 SXF/CXF WR101-160
VERTEX
$1,315.95A complete engine rebuild demands precision components that restore your KTM 250 SXF/CXF to factory specifications—and this VERTEX kit delivers exactly that. Rather than sourcing individual components from multiple suppliers, this comprehensive kit...09031261- SKU:
- 09031261
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
$1,315.95 -
VERTEX Engine Rebuild Kit - KTM XC/XC-W 250 | Husqvarna TE250 WR101-091
VERTEX
$1,013.95When your KTM XC/XC-W 250 or Husqvarna TE250 engine reaches the end of its service life, a quality rebuild kit saves time and eliminates guesswork—you get every critical component in one box instead of chasing down parts individually. The VERTEX Engine...09031066- SKU:
- 09031066
- Availability:
- Ships Same Business Day
- Weight:
- 15.20 LBS
$1,013.95 -
Wossner Piston Ring Set 97.00mm Yamaha YZ450F 2020-2022 970XSY-3
WOSSNER
$41.50Worn or damaged piston rings compromise combustion efficiency and increase blow-by, robbing your YZ450F of power and responsiveness. This Wossner ring set restores proper cylinder sealing with precision-engineered specs that match your engine's exact...09120689- SKU:
- 09120689
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
$41.50Qty in Cart: 0Quantity:Price:$41.50Subtotal: -
MOOSE OFFROAD Cylinder - 66.40 mm - Yamaha MSE20009
MOOSE OFFROAD
$597.95A worn or damaged cylinder compromises ring seal, increases blowby, and degrades power output—issues that ripple through your entire engine. This MOOSE OFFROAD cylinder restores your Yamaha to OEM specifications with a precision-honed bore and advanced...09311074- SKU:
- 09311074
- Availability:
- Ships Same Business Day
- Weight:
- 6.15 LBS
$597.95 -
HOT RODS Crankshaft - OEM Stroke - Polaris HR00046
HOT RODS
$1,104.95If you're running a Polaris engine that demands reliability on the track or trail, a properly balanced crankshaft is non-negotiable—it's the foundation that keeps your entire rotating assembly in harmony. This OEM-stroke HOT RODS replacement eliminates...09210888- SKU:
- 09210888
- Availability:
- Ships Same Business Day
- Weight:
- 19.65 LBS
$1,104.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475014
ATHENA
MSRP: $54.95Now: $49.00Was: $54.95A worn or degraded water pump gasket kit compromises your cooling system's integrity, leading to coolant leaks, overheating, and potential engine damage. The ATHENA Water Pump Gasket Kit for Yamaha delivers OEM-equivalent sealing performance with...09347194- SKU:
- 09347194
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $54.95Now: $49.00Was: $54.95 -
KIBBLEWHITE Spring Kit 30-33600
KIBBLEWHITE
$213.03If you're running boost or pushing your engine to its limits, valvetrain control becomes non-negotiable. The KIBBLEWHITE Spring Kit 30-33600 delivers the spring rates and component durability needed to maintain precise valve timing and lift at high RPMs,...09263377- SKU:
- 09263377
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$213.03 -
KIBBLEWHITE Valve Kit - Intake 30-34000
KIBBLEWHITE
$184.09A properly functioning intake valve system is fundamental to engine reliability and performance—worn or substandard valves compromise compression, increase blowby, and accelerate wear on your entire drivetrain. The KIBBLEWHITE Valve Kit delivers Black...09263378- SKU:
- 09263378
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
$184.09 -
KIBBLEWHITE Valve - Intake - Black Diamond* 30-33612
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency and engine reliability—particularly under high-RPM racing conditions where standard valves falter. Kibblewhite's Black Diamond valves use proprietary multi-stage processing to reduce...09263379- SKU:
- 09263379
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$37.55 -
KIBBLEWHITE Valve - Exhaust - Black Diamond* 30-33616
KIBBLEWHITE
$37.55If you're running high-RPM applications or pushing your engine to its limits, valve quality directly impacts reliability and longevity. The Kibblewhite Black Diamond Exhaust Valve delivers the precision engineering and material science needed to handle...09263380- SKU:
- 09263380
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
$37.55 -
KIBBLEWHITE Valve Guide - Intake - Standard 30-33620
KIBBLEWHITE
$24.89Valve guides are critical to maintaining proper valve seat geometry and preventing blow-by that kills performance and reliability. KIBBLEWHITE's Ampco-45 construction ensures superior heat dissipation and wear resistance, keeping your intake valves...09263381- SKU:
- 09263381
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$24.89 -
KIBBLEWHITE Valve Guide - Intake - +0.010" 30-33629
KIBBLEWHITE
$24.89Worn valve guides compromise cylinder head integrity and allow oil to seep into the combustion chamber, killing performance and reliability. KIBBLEWHITE intake valve guides are precision-engineered from Ampco-45 to restore proper valve sealing and heat...09263382- SKU:
- 09263382
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$24.89 -
KIBBLEWHITE Valve Guide - Exhaust - Standard 30-33630
KIBBLEWHITE
$24.89Exhaust valve guides experience extreme thermal cycling and abrasive wear—they're critical to maintaining valve sealing integrity and engine longevity. The KIBBLEWHITE Standard 30-33630 uses Ampco-45 bronze, a copper-nickel alloy specifically engineered...09263383- SKU:
- 09263383
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$24.89 -
On Sale
KIBBLEWHITE Valve Guide - Exhaust - +0.010" 30-33639
KIBBLEWHITE
MSRP: $22.95Now: $16.00Was: $22.95Worn or damaged valve guides compromise cylinder head integrity and allow oil to seep into combustion chambers, reducing performance and increasing emissions. KIBBLEWHITE's +0.010" exhaust valve guides are precision-engineered to restore proper valve...09263384- SKU:
- 09263384
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $22.95Now: $16.00Was: $22.95 -
KIBBLEWHITE Spring Kit 40-41600
KIBBLEWHITE
$213.03If you're running a forced induction setup or high-lift cam profile, stock valve springs will cost you reliability and peak power. The KIBBLEWHITE Spring Kit 40-41600 delivers the valvetrain control needed to safely maximize RPM without float or valve...09263385- SKU:
- 09263385
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
$213.03 -
KIBBLEWHITE Valve Kit - Intake 40-41650
KIBBLEWHITE
$168.62Your engine's intake valves are constantly under extreme thermal and mechanical stress—worn or substandard valves will compromise combustion efficiency, increase friction losses, and accelerate wear on your entire valve train. The KIBBLEWHITE Black...09263386- SKU:
- 09263386
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$168.62 -
KIBBLEWHITE Valve - Intake - White Diamond 40-41612H
KIBBLEWHITE
$31.01Kibblewhite's White Diamond intake valves are engineered for maximum durability and thermal stability in high-performance applications. Built from premium EV8 stainless steel or Inconel-751 and finished with hard chrome electroplating, these valves...09263387- SKU:
- 09263387
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
$31.01
