In the center of the pulley, a recoil spring connects to the pulley through a hook. When the starter rope gets pulled off the pulley and out of the engine, the recoil spring stretches out. … This allows the operator to continuously pull the rope to get the engine moving faster and faster toward combustion.

How do you reform a spring?

1. Use a putty knife to separate one coil from the rest of the spring.
2. Ignite the Bernzomatic TS8000, and slowing apply heat to the single coil, heat until the coil is cherry red.
3. Using the pliers, bend the coil to match the other end of the spring.

How does a rewind spring work?

When inserted into the blower housing and rewind assembly, the spring engages a small tab on the inside of the housing. As the pulley is turned, the spring is wound tighter and tighter, providing the recoil necessary to keep the starter rope wound onto the pulley.

What causes a pull cord to lock up?

One way the starter cord can get stuck is due to hydraulic lock, which is caused by oil getting trapped in the combustion chamber. You’ll need to release the compression and the oil, so remove the spark plug and then give the cord a tug.

How does lawn mower pull cord work?

The starting cord is wound around a spring-loaded hub that is designed to engage with the engine flywheel. When you pull the cord, the flywheel rotates, which in turn rotates the crankshaft and moves the piston. A magnetic coupling on the flywheel causes the spark plug to fire cyclically as the piston moves,.

What does it mean when the lawn mower string won't pull?

What if the starter rope won’t pull? The crankshaft is connected to the blade shaft on your recoil start walk behind lawn mower, so if the pull cord is stuck, it could be because something is blocking the movement of the blade. Disconnect the spark plug for safety, then take a look under the deck.