This blog is a step-by-step instruction for replacing the flywheel key on an Echo leaf blower. The most common reasons for replacing the flywheel key is when it is missing, bent, or otherwise damaged, which will make the engine run rough or only for a few seconds if it runs at all.

Replacement

Before you begin the replacement, you need to make sure the engine and muffler have cooled and the on/off switch is in the off position. You also need to remove the wire and boot from the spark plug to prevent the engine from accidentally starting.

Step 1: Now use a t25 Torx bit screwdriver to unthread the mounting screws securing the engine cover. With the screws removed, carefully detached the cover, next remove the blower tube if still intact.
Step 2: Now unthread all of the screws securing the blower cover. With the screws removed, pull off the cover and confirm that the piston is in the down position then insert a cord into the cylinder to prevent the piston from moving.
Step 3: Now rotate the blower wheel counterclockwise to unthread the fan hub. You can use a mallet to help loosen the flywheel then pull the flywheel off of the crankshaft, you can also use pliers or a wire cutter to remove the old flywheel key if still intact.
Step 4: Install the new flywheel key by inserting the rounded edge into the slot in the crankshaft. Replace the flywheel by aligning the notch in the flywheel with the new flywheel key.
Step 5: Realign the hub and blower wheel on the crankshaft and rotate the blower wheel clockwise until secure.
Step 6: Remove the cord from the cylinder and make sure the blower tube lock is in place, then reposition the blower cover. Thread and tighten all of the screws to secure.
Step 7: Reinstall the blower tube and confirm that the throttle linkage is in place then realign the engine cover. Replace the mounting screws to secure the cover. Rethread the spark plug and be careful not to strip the threads by over-tightening. Reattach the wire in boot to the plug.

With the repair completed, turn the on/off switch to the on position and your leaf blower should be ready for use.

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