How to Do a Top-End Rebuild on a Dirt Bike

Dirt bike riders are really hard on their equipment, jumping and dropping the bike and pushing it to its limits every time they take it out. To keep a dirt bike in top running condition and to avoid bigger problems, a top-end rebuild should be done at least once a year, whether you are having any technical problems or not. Some riders do the job every 200 miles or so.

Things You'll Need

  • Torque wrench
  • Base nut adapter
  • Rubber mallet
  • Razor blades
  • Solvent
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Instructions

    • 1

      Get out the manual. Unless you are a professional who looks at dirt bike engines all day long, you should have the manual handy before you start taking apart your engine.

    • 2

      Drain all the fluids from the bike and remove any parts that are in the way of reaching the motor. Remove the spark plugs and the carburetor.

    • 3

      Pull off the cam cover and the cams and chains using the right-size tool for your engine parts. Make sure all the timing marks are lined up.

    • 4

      Clean and check all the valves and sprockets to make sure everything is fitting properly. Use solvent and a mild abrasive such as steel wool or razor blades to scrub any build-up.

    • 5

      Remove the pistons and rings. Line up all the parts in the order they were removed. Replace worn parts.

    • 6

      Put everything back together and tighten all the bolts. Add oil and take her for a spin.