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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WORKS CONNECTION Engine Plug - Red - Gas Gas/Husqvarna/KTM 24-451
WORKS CONNECTION
$30.95Stock engine plugs invite vibration, corrosion, and a cluttered engine bay. WORKS CONNECTION's precision-machined aluminum plugs deliver a clean aesthetic while protecting critical engine ports with reliable, long-lasting construction. The simple Allen...09500978- SKU:
- 09500978
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
$30.95 -
On Sale
WORKS CONNECTION Engine Plug - Black - Gas Gas/Husqvarna/KTM 24-452
WORKS CONNECTION
MSRP: $30.95Now: $21.00Was: $30.95Stock engine plugs are vulnerable to damage and corrosion, compromising both aesthetics and reliability on your off-road machine. These precision-machined WORKS CONNECTION plugs deliver a factory-quality replacement with a refined look that complements...09500979- SKU:
- 09500979
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
MSRP: $30.95Now: $21.00Was: $30.95 -
WORKS CONNECTION Engine Plug - Orange - Gas Gas/Husqvarna/KTM 24-453
WORKS CONNECTION
$30.95Stock engine plugs are prone to corrosion and can detract from your bike's appearance—especially if you've invested in premium components elsewhere. These WORKS CONNECTION plugs deliver both aesthetic upgrade and functional reliability, with...09500980- SKU:
- 09500980
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$30.95 -
WORKS CONNECTION Engine Plug - Silver - Gas Gas/Husqvarna/KTM 24-454
WORKS CONNECTION
$29.95Stock engine plugs are prone to corrosion and can detract from an otherwise refined build. These WORKS CONNECTION plugs replace worn or damaged originals with precision-machined aluminum components that deliver both durability and a polished aesthetic...09500981- SKU:
- 09500981
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$29.95 -
WORKS CONNECTION Radiator Drain Plug - Silver - Honda/Kawasaki 24-634
WORKS CONNECTION
$23.95Stock plastic radiator drain plugs are prone to cracking and leaking under thermal stress—a problem that can compromise your cooling system and derail race day. The WORKS CONNECTION billet aluminum drain plug replaces that weak link with a...09500986- SKU:
- 09500986
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$23.95 -
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 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 -
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
