How to Replace the Ignition Coil on a Weed Eater Blower

The ignition module works with the flywheel to produce the electric current needed for the spark plug. The flywheel has a couple of magnets mounted on it at specific locations. As the magnets pass by the ignition module, they induce an electric current within the ignition module's windings. This current is sent to the spark plug at the precise time it is needed to ignite the air-fuel mixture inside the cylinder.

Let's get started.

REMOVING THE IGNITION MODULE   1. Remove the blower tube.

a. Pull the blower tube away from the housing.

  2. Remove the impeller.

a. Remove the screws securing the impeller guard from the scroll housing.

b. Remove the impeller guard.

c. Use an impact driver to remove the nut securing the impeller to the motor shaft.

d. Remove the impeller washers and the lock washer.

e. Remove the impeller from the blower.

  3. Remove the fuel tank.

a. Drain any excess fuel from the fuel tank.

b. Remove the two screws securing the fuel tank to the scroll housing.

c. Separate the fuel tank from the lower scroll housing.   4. Remove the scroll housing assembly.

a. Remove the screws securing the scroll housing assembly to the motor housing.

b. Remove the scroll housing assembly from the blower.   5. Remove the muffler guard.

a. Remove the two screws securing the muffler guard to the motor housing.

b. Remove the muffler guard from the blower.   6. Remove the upper motor housing.

a. Remove the screws securing the upper motor housing the lower motor housing.

b. Remove the handle assembly.

c. Remove the upper motor housing from the blower.   7. Remove the lower motor housing (and starter assembly).

a. Remove the screws securing the lower motor housing (and starter assembly) to the motor.

b. Lift the lower motor housing (and starter assembly) away from the motor.   8. Remove the ignition module.

a. Disconnect the spark plug boot.

b. Remove the two screws securing the ignition module to the motor.

c. Remove the ignition module.

INSTALLING THE NEW IGNITION MODULE   9. Install the ignition module.

a. Install the new ignition module and align the mounting holes on the module with the holes on the motor bracket.

b. Install (but do not tighten) the screws to hold the ignition module in place.

c. Rotate the flywheel to align its magnets with the contacts on the new ignition module.

d. Insert an ignition air gapping gauge between the contacts on the new ignition module and the magnets on the flywheel.

e. Allow the magnets on the flywheel to engage the contacts on the new ignition module (through the air gapping gauge).

f. Tighten the screws to secure the ignition module.

g. Remove the ignition gapping gauge.

REASSEMBLING THE UNIT   10. Reinstall the lower motor housing (and starter assembly).

a. Install the lower motor housing onto the motor.

b. Verify that the primary ignition wire is not obstructed (pinched) by the motor housing.

c. Secure the lower motor housing (and starter assembly) with the screws.   11. Reinstall the upper motor housing.

a. Connect the spark plug boot to the spark plug.

b. Install the upper motor housing.

c. Install the handle assembly.

d. Secure the upper motor housing and the handle with the screws.   12. Reinstall the muffler guard.

a. Install the muffler guard.

b. Secure the muffler guard with the two screws.   13. Reinstall the scroll housing assembly.

a. Install the motor onto the scroll housing assembly.

b. Secure the scroll housing assembly to the motor with the screws.   14. Reinstall the fuel tank.

a. Install the fuel tank onto the scroll housing.

b. Secure the fuel tank with the two screws.   15. Reinstall the impeller.

a. Install the impeller.

b. Install the large impeller washer.

c. Install the lock washer.

d. Install the impeller nut.

e. Use an impact driver to tighten the impeller nut and secure the impeller.   16. Reinstall the impeller guard.

a. Install the impeller guard.

b. Secure the impeller guard with the screws.   17. Reinstall the blower tube.

a. Install the blower tube onto the scroll housing.