Adjust Harley Pushrods

Adjustable pushrods allow your Harley Davidson motorcycle to function properly without creating additional noise in the cams. The following procedure on how to adjust Harley pushrods is provided for those less experienced in the field or for those in need of a refresher course. Please read thoroughly before proceeding.

Steps

  1. Allow the bike to rest several hours if it's been running or let it sit overnight.
    • This is because the heat from the engine expands the metal on the pushrods, which makes the initial adjustment difficult.
  2. Remove the 2 spark plugs using a socket wrench with an extension.
    • This will make rotating the engine hassle-free because the plugs would otherwise cause an obstruction.
  3. Lift all 4 of the covers of the rods with a pair of pliers until they no longer move.
    • To keep them in place secure them you may use paperclips or spring-loaded clothes pins which will not damage the covers.
    • It's possible to use just your fingers, but can often make it more difficult and time consuming.
  4. Use a jack or a hydraulic bike lift to raise the rear wheel off the ground.
  5. Shift the transmission into 4th gear.
  6. Start the engine and listen carefully for any sounds.
  7. Rotate the rear wheel clockwise.
    • This will essentially rotate the engine.
    • Watch the motorcycle rear exhaust valve in the engine until the lifters (pistons) open up the valve to its highest point.
    • Harley valve positions can be determined by observing their cylinders for each individual pushrod.
  8. Spin the Harley pushrods between your thumb and forefinger.
    • Be sure there is no friction (drag) as you do so.
    • If there is some resistance, use one wrench to adjust the screw and a second wrench to turn the split lug nut and tighten or loosen as needed.
    • Repeat this step for each cylinder.
  9. Remove all the clips or pins once all the pushrods are adjusted correctly and return the covers to their original positions over the cylinders.
  10. Turn the rear wheel counter-clockwise until the engine is back in place.
    • If there is no noise, the rods may be too tight.
    • Additional noise indicates that they are too loose.
    • Adjust them again to an acceptable medium if needed.
  11. Re-install all the spark plugs.
    • Apply with the socket wrench again.
  12. Lower the bike/rear wheel to the ground and off the jack/lift.
  13. Take the bike out for a brief ride and listen closely for any additional noise.

Tips

  • If you decide to use your fingers to rotate the cylinders or the lug nut, it might be prudent to wear a pair of work gloves or thin garden gloves to prevent any accidental injuries.
  • You should always make sure that the pushrods are at their lowest point before adjustment.
  • Refer to the manufacturers' manual if you're unsure if the cylinders are of the non-stock adjustable variety.

Things You'll Need

  • Jack or Hydraulic Bike Lift
  • 4 Paper Clips or 4 Spring-Loaded Clothes Pins
  • 1 Pair of pliers
  • 2 Wrenches
  • Socket wrench with extension
  • Gloves (optional)

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References

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