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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BOYESEN Impeller/Waterpump Cover - Black WPK-44AB
BOYESEN
$194.95Engine temperature stability is critical to reliability and longevity, especially under sustained performance driving. The Boyesen WPK-44AB delivers measurable cooling gains by increasing coolant flow across the entire RPM range, keeping your engine...09320154- SKU:
- 09320154
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BASE FINISH:
- POWDER-COATED
- COLOR/FINISH:
- BLACK
- UNITS:
- KIT
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPERCOOLER
- TYPE:
- WATER PUMP
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- RIDING STYLE:
- OFF-ROAD
$194.95 -
HOT RODS Seal Output Shaft OSK0038
HOT RODS
$35.95A leaking countershaft seal doesn't just waste oil—it compromises your transmission's performance and can lead to catastrophic bearing failure if left unchecked. The HOT RODS Seal Output Shaft kit eliminates guesswork by bundling everything you need for...09350560- SKU:
- 09350560
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- UNITS:
- KIT
$35.95 -
HOT RODS Seal Output Shaft OSK0040
HOT RODS
$37.95A leaking countershaft seal doesn't just waste oil—it compromises your transmission's reliability and can lead to catastrophic bearing failure if left unaddressed. The HOT RODS Seal Output Shaft kit eliminates guesswork by bundling every component you...09350562- SKU:
- 09350562
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL
- UNITS:
- KIT
$37.95 -
HOT RODS Seal Output Shaft OSK0050
HOT RODS
$39.95A leaking countershaft seal compromises transmission performance and risks catastrophic bearing failure if left unaddressed. This complete repair kit eliminates guesswork by bundling all necessary components—seal, bushing, O-rings, and hardware—into one...09350565- SKU:
- 09350565
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL
$39.95 -
HOT RODS Seal Output Shaft OSK0052
HOT RODS
$39.95A leaking countershaft seal will compromise transmission fluid integrity and accelerate wear on internal components—addressing it immediately prevents costly engine damage. The HOT RODS OSK0052 delivers a complete repair solution in a single kit,...09350567- SKU:
- 09350567
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL
$39.95 -
HOT RODS Seal Output Shaft OSK0003
HOT RODS
$25.95A leaking countershaft seal doesn't just waste oil—it compromises engine reliability and can lead to catastrophic bearing failure if left unaddressed. The HOT RODS Seal Output Shaft kit (OSK0003) eliminates the guesswork by bundling everything you need...09350570- SKU:
- 09350570
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
$25.95 -
HOT RODS Seal Output Shaft OSK0007
HOT RODS
$14.95A leaking countershaft seal compromises transmission reliability and can lead to costly damage if ignored. This complete HOT RODS repair kit eliminates the guesswork by bundling everything you need to restore a proper seal in one purchase, saving you...09350573- SKU:
- 09350573
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
$14.95 -
HOT RODS Top End Bearing WB102
HOT RODS
$21.95The piston end of your connecting rod demands precision engineering to handle extreme reciprocating forces without wear or failure. A quality needle-cage bearing like the HOT RODS WB102 reduces friction at the wrist pin interface, directly improving...09240567- SKU:
- 09240567
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- WRIST PIN
- PRODUCT NAME:
- BEARING
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
$21.95 -
HOT RODS Connecting Rod 8643
HOT RODS
$232.95If you're building or rebuilding a high-performance engine, your connecting rods are the backbone of reliability under extreme loads and RPM. The HOT RODS 8643 is engineered with the metallurgy and precision manufacturing required to handle forced...09230063- SKU:
- 09230063
- Availability:
- Ships Same Business Day
- Weight:
- 1.76 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- MATERIAL:
- 8620 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-CYCLE
$232.95 -
HOT RODS Crankshaft Kit CBK0175
HOT RODS
$716.95If you're building a high-performance engine or need reliable bottom-end durability, a quality crankshaft assembly is non-negotiable. The HOT RODS Crankshaft Kit CBK0175 delivers factory-matched precision with the strength to handle boost, nitrous, or...09210481- SKU:
- 09210481
- Availability:
- Ships Same Business Day
- Weight:
- 13.45 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$716.95 -
HOT RODS Crankshaft Kit CBK0176
HOT RODS
$768.95If you're building a high-performance engine or rebuilding a tired block, the HOT RODS Crankshaft Kit CBK0176 gives you factory-spec reliability with performance-grade durability. This complete assembly arrives ready to install, eliminating the guesswork...09210482- SKU:
- 09210482
- Availability:
- Ships Same Business Day
- Weight:
- 13.50 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STROKER
- UNITS:
- KIT
$768.95 -
HOT RODS Connecting Rod 8188
HOT RODS
$200.95If you're building or rebuilding an engine that sees sustained high-RPM operation, connecting rod failure isn't an option—it's a catastrophic outcome. The HOT RODS 8188 delivers the strength and precision needed to handle extreme loads while maintaining...09230326- SKU:
- 09230326
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MATERIAL:
- 8620 STEEL
- RIDING STYLE:
- SNOW
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- UNITS:
- KIT
$200.95 -
HOT RODS Connecting Rod 8189
HOT RODS
$208.95When you're pushing an engine to its limits, the connecting rod is the critical link between piston speed and crankshaft reliability. The HOT RODS 8189 is built to withstand the extreme pressures of high-RPM operation with certified materials and...09230327- SKU:
- 09230327
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MATERIAL:
- 8620 STEEL
- ENGINE TYPE:
- 2-CYCLE
- RIDING STYLE:
- SNOW
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- UNITS:
- KIT
$208.95 -
HOT RODS Connecting Rod 8710
HOT RODS
$397.95When you're pushing your engine to the limit, stock connecting rods become your weakest link. The HOT RODS 8710 is engineered to handle extreme rpm, heavy loads, and sustained high-performance operation without sacrificing reliability. This is a...09230375- SKU:
- 09230375
- Availability:
- Ships Same Business Day
- Weight:
- 1.43 LBS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$397.95 -
HOT RODS Connecting Rod 8718
HOT RODS
$159.95A connecting rod failure at high RPM can mean catastrophic engine damage and a DNF. The HOT RODS 8718 is engineered with 8620 AISI certified steel and precision-machined components to handle sustained power loads without compromise. Built for reliability...09230564- SKU:
- 09230564
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CONNECTING ROD KIT
- MATERIAL:
- 8620 STEEL
$159.95 -
HOT RODS Crank Bearings K070
HOT RODS
$100.95A crankshaft is only as reliable as its bearing package. The HOT RODS K070 crank bearing kit delivers precision-engineered main bearings and seals that eliminate play, reduce friction, and ensure consistent oil pressure across the entire stroke. Whether...09240246- SKU:
- 09240246
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- BALL
- UNITS:
- SET
- APPLICATION:
- MAIN CRANKSHAFT
$100.95 -
HOT RODS Crank Bearings K074
HOT RODS
$118.95A crankshaft is only as reliable as its bearings. The HOT RODS K074 crank bearing kit delivers precision-engineered main bearing and seal components designed to handle the demanding loads of high-performance engines. Whether you're rebuilding a race...09240283- SKU:
- 09240283
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
$118.95 -
HOT RODS Crank Bearings K083
HOT RODS
$45.95A crankshaft is only as reliable as its bearings. The HOT RODS K083 Crank Bearings deliver the precision fit and durability required for high-RPM applications, whether you're rebuilding a stock engine or pushing forced induction limits. These bearings...09240286- SKU:
- 09240286
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$45.95 -
HOT RODS Crank Bearings K091
HOT RODS
$83.95A quality crankshaft assembly is only as reliable as its sealing system. The HOT RODS Crank Bearings K091 seal kit provides the critical barrier between your engine's internal lubrication and external contaminants, ensuring consistent oil pressure and...09240400- SKU:
- 09240400
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- PRODUCT NAME:
- BEARING SET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$83.95 -
HOT RODS Crank Bearings K092
HOT RODS
$165.95A quality crankshaft seal kit is non-negotiable if you're installing a Hot Rods crank assembly—it ensures critical oil containment and prevents leakage that could compromise engine performance or cause catastrophic failure. The K092 seal kit is...09240401- SKU:
- 09240401
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING SET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$165.95
