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dirt bike Engine

Fits Your MachineDisplaying parts for your 2006 KTM 125 SX
Tusk Top End Gasket Kit$15.95MSRP: $31.99 You save 50%
Rated 4.44 out of five stars.★★★★⯪
Tusk Complete Gasket Kit$28.95MSRP: $37.99 You save 24%
Rated 4.36 out of five stars.★★★★⯪
Tusk Clutch Cover Gasket$7.99MSRP: $9.99 You save 20%
Rated 4.46 out of five stars.★★★★⯪
Tusk Clutch Kit With Heavy Duty Springs$55.99MSRP: $69.98 You save 20%
Rated 4.48 out of five stars.★★★★⯪
Tusk Competition Clutch Kit$54.99MSRP: $74.99 You save 27%
Rated 4.51 out of five stars.★★★★⯪
Tusk Engine Oil Seal Kit$10.99MSRP: $15.99 You save 31%
Rated 4.55 out of five stars.★★★★⯪
Wiseco Piston Kit$116.12MSRP: $145.18 You save 20%
Rated 4.83 out of five stars.★★★★★
Tusk Oil Filler Plug$9.99MSRP: $14.99 You save 33%
Rated 4.83 out of five stars.★★★★★
Tusk Magnetic Drain Bolt$7.49MSRP: $11.95 You save 37%
Rated 4.72 out of five stars.★★★★★
Vertex Piston Kit Standard$120.47 – $135.11MSRP: $133.85 – $158.95 You save up to 15%
Rated 4.75 out of five stars.★★★★★
Tusk Competition Clutch Kit with Heavy Duty Springs$59.99MSRP: $84.98 You save 29%
Rated 4.72 out of five stars.★★★★★
Tusk Water Pump Repair Kit$19.99MSRP: $29.99 You save 33%
Rated 4.88 out of five stars.★★★★★
Tusk Clutch Kit$49.99MSRP: $59.99 You save 17%
Rated 4.54 out of five stars.★★★★⯪
Tusk Counter Shaft Seal Kit$18.99MSRP: $24.99 You save 24%
Rated 4.50 out of five stars.★★★★⯪
Pro X Piston Kit$100.61MSRP: $124.21 You save 19%
Rated 4.54 out of five stars.★★★★⯪
Tusk Inner Clutch Cover Gasket$6.99MSRP: $8.99 You save 22%
Rated 5.00 out of five stars.★★★★★
Tusk Clutch Spring Set$6.99MSRP: $9.99 You save 30%
Rated 4.62 out of five stars.★★★★⯪
Pro X Ignition Cover Gasket$8.70MSRP: $9.77 You save 11%
Rated 4.94 out of five stars.★★★★★
Pro X Connecting Rod Kit$98.37MSRP: $129.43 You save 24%
Rated 4.92 out of five stars.★★★★★
Pro X Clutch Cover Gasket$11.05MSRP: $12.56 You save 12%
Rated 4.53 out of five stars.★★★★⯪
Pro X Complete Gasket Set$81.69MSRP: $96.10 You save 15%
Rated 4.46 out of five stars.★★★★⯪
Hot Rods Water Pump Repair Kit$35.06MSRP: $38.95 You save 10%
Rated 4.66 out of five stars.★★★★⯪
Steahly Heavy Flywheel Weight$154.95
Rated 4.74 out of five stars.★★★★★
Hinson FSC Clutch Plate and Spring Kit$199.99
Rated 4.84 out of five stars.★★★★★
Wiseco Racer's Elite Piston Kit$164.38MSRP: $204.17 You save 19%
Rated 4.21 out of five stars.★★★★☆
All Balls Counter Shaft Seal Kit$22.04MSRP: $24.49 You save 10%
Rated 4.74 out of five stars.★★★★★
KTM Complete Clutch Kit$256.18
Rated 4.68 out of five stars.★★★★★
Tusk Shift Shaft Seal$4.59MSRP: $5.99 You save 23%
Rated 5.00 out of five stars.★★★★★
Bolt Engine Fastener Kit$35.99MSRP: $39.99 You save 10%
Rated 4.50 out of five stars.★★★★⯪
Boyesen Clutch Cover$79.88MSRP: $95.95 You save 17%
Rated 4.60 out of five stars.★★★★⯪
Wiseco Bottom End Rebuild Kit$479.83MSRP: $569.32 You save 16%
Rated 4.38 out of five stars.★★★★⯪
Wiseco Piston Replacement Circlip$2.65MSRP: $2.79 You save 5%
Rated 4.86 out of five stars.★★★★★
Boyesen Clutch Cover Replacement Gasket$8.99
Rated 4.64 out of five stars.★★★★⯪
Pro X Counter Shaft Seal Kit$21.66MSRP: $24.07 You save 10%
Rated 4.77 out of five stars.★★★★★
All Balls Clutch Slave Cylinder Repair Kit$35.81MSRP: $39.79 You save 10%
Rated 3.42 out of five stars.★★★⯪☆
Pro X OEM Clutch Kit$113.95MSRP: $137.15 You save 17%
Rated 4.73 out of five stars.★★★★★
Bullet Proof Designs Oil Drain Kit$17.99
Rated 4.00 out of five stars.★★★★☆
All Balls Crankshaft Seal Kit$29.85MSRP: $33.17 You save 10%
Rated 3.82 out of five stars.★★★★☆
Works Connection Oil Filler Plug$29.66 – $29.95MSRP: $32.95 You save up to 10%
Rated 4.76 out of five stars.★★★★★
Pro X Piston Replacement Circlip$1.95
Rated 4.76 out of five stars.★★★★★
Pro X Clutch Slave Cylinder Repair Kit$30.85MSRP: $36.73 You save 16%
Rated 3.70 out of five stars.★★★★☆
Pro X OEM Clutch Plate Set Friction$71.82MSRP: $84.49 You save 15%
Rated 4.85 out of five stars.★★★★★
KTM Factory Oil Filler Plug$24.99
Rated 4.00 out of five stars.★★★★☆
Hot Rods Complete Crankshaft Assembly$356.36MSRP: $395.95 You save 10%
Rated 4.76 out of five stars.★★★★★
Pro X Clutch Dampener Rubber Sets$56.09MSRP: $73.80 You save 24%
Rated 4.67 out of five stars.★★★★★
Nihilo Concepts Oil Filler Plug$24.99
Rated 4.40 out of five stars.★★★★⯪
Rekluse Clutch Friction Plate Set$139.00
Rated 4.86 out of five stars.★★★★★
Wiseco Piston Replacement Wristpin$19.01MSRP: $22.04 You save 14%
Rated 4.94 out of five stars.★★★★★
Rekluse Clutch Basket$299.00
Rated 4.88 out of five stars.★★★★★

Dirt Bike Engine Parts

A dirt bike engine is an incredible piece of machinery, finely tuned for the rigors of off-road thrills. It keeps your motorcycle on the go in some of the roughest terrain, whether it’s the precision of a cleverly crafted motocross track or the raw appeal of nature’s finest trails. Your dirt bike’s engine is complex and intricate. A lot goes on in there, and it needs to be kept in the best shape possible in order to produce the results you’ve come to expect. When it’s time to look for dirt bike engine parts, you know you can turn to Rocky Mountain ATV/MC.

We carry a wide variety of motorcycle engine parts. If you only need a few replacement parts, we’ve got everything from crankshaft assemblies to piston kits to oil filters. If you want to upgrade your existing parts to improve your bike’s overall power or handling, we carry parts as varied as big bore kits, flywheels and individual shims. And since we’ve got the best prices around, you don’t need to feel worried about an overwhelming engine rebuild cost. In fact, you might be surprised at how affordable it can be to make some serious enhancements to your dirt bike’s engine!

We carry the names you’d expect for dirt bike engine parts: Wiseco, Athena, Cylinder Works, Rekluse, Pro X, Hot Cams, Vertex and more. (If you check out our section for OEM parts, you can find original stock replacements as well.) If you want to replace a few shot parts, you’re in the right place. If you want to rebuild your engine to be the best motocross engine or enduro engine it can be, you’ll find what you need here.

From the simplest piston circlip to the most advanced automatic clutch kit, we’ve got you covered for all of your dirt bike engine needs. So whether you’re in the process of a complete engine rebuild or just want the best motocross engine mods, you know that there’s nowhere better than Rocky Mountain ATV/MC!

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