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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Wrench Rabbit Complete Engine Rebuild Kit for 1989-2001 Honda CR500R WR101-017
WRENCH RABBIT
$920.95When your Honda CR500R two-stroke demands a complete overhaul, settling for partial kits means risking engine reliability and performance. The Wrench Rabbit Complete Engine Rebuild Kit eliminates...09030957- SKU:
- 09030957
- Availability:
- Ships Same Business Day
- Weight:
- 18.70 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
$920.95 -
Wrench Rabbit Engine Rebuild Kit for 2005-2007 Honda CR85R CR85RB WR101-018
WRENCH RABBIT
$499.95Two-stroke engines don't rebuild themselves—and when your Honda CR85R or CR85RB crankcase starts showing wear, half-measures won't cut it. The Wrench Rabbit Engine Rebuild Kit (WR101-018) gives you a...09030958- SKU:
- 09030958
- Availability:
- Ships Same Business Day
- Weight:
- 8.45 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$499.95 -
Wrench Rabbit Honda CRF250R 2005 Engine Rebuild Kit WR101-020
WRENCH RABBIT
$1,052.95When your Honda CRF250R engine reaches the end of its service life, a complete rebuild is the most cost-effective path to restored performance and reliability. The Wrench Rabbit WR101-020 eliminates...09030960- SKU:
- 09030960
- Availability:
- Ships Same Business Day
- Weight:
- 12.75 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,052.95 -
Wrench Rabbit Engine Rebuild Kit for 2006 Honda CRF 250R WR101-021
WRENCH RABBIT
$1,092.95When your Honda CRF 250R engine shows signs of wear—loss of compression, top-end knock, or declining power delivery—a full rebuild is the most cost-effective path to restoring reliability and...09030961- SKU:
- 09030961
- Availability:
- Ships Same Business Day
- Weight:
- 12.67 LBS
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
$1,092.95 -
Wrench Rabbit Engine Rebuild Kit for 2007 Honda CRF250R WR101-022
WRENCH RABBIT
$1,092.95When your Honda CRF250R's engine reaches the end of its service life, a quality rebuild kit saves you thousands compared to purchasing a complete new engine. The Wrench Rabbit WR101-022 bundles every...09030962- SKU:
- 09030962
- Availability:
- Ships Same Business Day
- Weight:
- 12.75 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$1,092.95 -
Wrench Rabbit Engine Rebuild Kit for 2008-2009 Honda CRF250R WR101-023
WRENCH RABBIT
$1,052.95When your Honda CRF250R's engine shows signs of wear—loss of compression, excessive blow-by, or declining power delivery—a complete rebuild is the most cost-effective path back to factory performance...09030963- SKU:
- 09030963
- Availability:
- Ships Same Business Day
- Weight:
- 12.70 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$1,052.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2004 Honda CRF450R WR101-025
WRENCH RABBIT
$1,132.95A complete engine rebuild requires precision components that work together seamlessly—this kit eliminates guesswork by bundling everything you need in one package. Whether you're addressing worn...09030965- SKU:
- 09030965
- Availability:
- Ships Same Business Day
- Weight:
- 15.88 LBS
- PRODUCT NAME:
- REBUILD KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
$1,132.95 -
Wrench Rabbit Engine Kit Honda CRF450R 2006 WR101-027
WRENCH RABBIT
$1,132.95A top-end rebuild alone won't cut it if your crankshaft, bearings, and seals are worn—this is where a complete engine kit becomes essential. The Wrench Rabbit Engine Kit for your CRF450R gives you...09030966- SKU:
- 09030966
- Availability:
- Ships Same Business Day
- Weight:
- 16.50 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$1,132.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2007-2008 Honda CRF450R WR101-028
WRENCH RABBIT
$985.95When your Honda CRF450R engine reaches the end of its service life, a complete rebuild restores it to factory specifications and reliability without the expense of a new powerplant. The Wrench Rabbit...09030968- SKU:
- 09030968
- Availability:
- Ships Same Business Day
- Weight:
- 15.91 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$985.95 -
Wrench Rabbit Engine Rebuild Kit for 2009-2012 Honda CRF450R WR101-030
WRENCH RABBIT
$1,132.95When your Honda CRF450R's engine shows signs of wear—whether it's loss of compression, excessive blow-by, or simply high mileage—a complete rebuild is the most cost-effective path to restored...09030970- SKU:
- 09030970
- Availability:
- Ships Same Business Day
- Weight:
- 17.35 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,132.95 -
Wrench Rabbit Engine Kit for 2003-2004 Kawasaki KFX400 WR101-039
WRENCH RABBIT
$1,092.95Whether you're rebuilding a tired KFX400 or restoring a neglected machine to factory specs, the Wrench Rabbit Engine Kit eliminates the guesswork by bundling all essential internal components into...09030976- SKU:
- 09030976
- Availability:
- Ships Same Business Day
- Weight:
- 12.00 LBS
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$1,092.95 -
Wrench Rabbit Engine Rebuild Kit for 2003-2004 Kawasaki KFX400 WR101-040
WRENCH RABBIT
$1,092.95When your KFX400's engine reaches the end of its service life, a quality rebuild kit saves you the time and guesswork of sourcing individual components. The Wrench Rabbit Engine Rebuild Kit delivers...09030977- SKU:
- 09030977
- Availability:
- Ships Same Business Day
- Weight:
- 13.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$1,092.95 -
Wrench Rabbit Engine Kit Kawasaki KX250F 2009 WR101-041
WRENCH RABBIT
$1,183.95A complete engine rebuild demands precision and reliability—the Wrench Rabbit Engine Kit for your 2009 Kawasaki KX250F delivers both in one comprehensive package. Rather than sourcing individual...09030978- SKU:
- 09030978
- Availability:
- Ships Same Business Day
- Weight:
- 13.15 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$1,183.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2011-2013 Kawasaki KX250F WR101-043
WRENCH RABBIT
$1,157.95When your KX250F's engine shows signs of wear—whether from years of trail riding or track use—a complete rebuild is the most cost-effective way to restore full performance and reliability. The Wrench...09030980- SKU:
- 09030980
- Availability:
- Ships Same Business Day
- Weight:
- 12.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$1,157.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 1992-1994 Honda CR250R WR101-012
WRENCH RABBIT
$867.95When your Honda CR250R two-stroke has logged serious hours, an engine rebuild becomes essential to restore power delivery and reliability. This complete kit eliminates the guesswork of sourcing...09030982- SKU:
- 09030982
- Availability:
- Ships Same Business Day
- Weight:
- 14.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- WRENCH RABBIT
$867.95 -
Wrench Rabbit Engine Rebuild Kit for 2010-2012 Kawasaki KX 450 F WR101-046
WRENCH RABBIT
$1,211.95When your KX 450 F reaches the end of its service life, a complete engine rebuild is the most cost-effective path back to peak performance. The Wrench Rabbit Engine Rebuild Kit eliminates the...09030984- SKU:
- 09030984
- Availability:
- Ships Same Business Day
- Weight:
- 16.25 LBS
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,211.95 -
Wrench Rabbit Engine Rebuild Kit Kawasaki KX65 2000-2001 WR101-047
WRENCH RABBIT
$592.95When your Kawasaki KX65 shows signs of wear—loss of compression, excessive blow-by, or sluggish throttle response—an engine rebuild restores it to factory performance specs without the downtime of...09030985- SKU:
- 09030985
- Availability:
- Ships Same Business Day
- Weight:
- 8.25 LBS
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- UNITS:
- KIT
$592.95 -
Wrench Rabbit Engine Rebuild Kit for 2005 Kawasaki KX65 WR101-050
WRENCH RABBIT
$564.95When your KX65's engine reaches the end of its service life, a quality rebuild kit is the fastest path back to reliable performance. The Wrench Rabbit Engine Rebuild Kit supplies every critical...09030988- SKU:
- 09030988
- Availability:
- Ships Same Business Day
- Weight:
- 8.25 LBS
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$564.95 -
Wrench Rabbit Kawasaki KX85 2007-2013 Complete Engine Rebuild Kit WR101-052
WRENCH RABBIT
$618.95When your KX85's engine reaches the end of its service life, a complete rebuild restores full performance and reliability without the cost of a replacement powerplant. This Wrench Rabbit kit...09030990- SKU:
- 09030990
- Availability:
- Ships Same Business Day
- Weight:
- 8.85 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$618.95 -
Wrench Rabbit Complete Engine Rebuild Kit for KTM 65 SX 2003-2008 WR101-054
WRENCH RABBIT
$711.95When your KTM 65 SX engine shows signs of wear—loss of compression, bearing play, or declining performance—a complete rebuild is the most cost-effective path back to reliability. This Wrench Rabbit...09030992- SKU:
- 09030992
- Availability:
- Ships Same Business Day
- Weight:
- 7.65 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
$711.95
