Why won't my tiller's engine start?

Repair or replace the tiller recoil starter

Many tillers have a recoil starter with a pull rope. The pull rope can usually be replaced if it breaks. If the pull rope doesn't retract, it's likely the spring is broken. Because replacing the spring is difficult and usually impractical, replace the whole recoil starter if the rope doesn't retract.

Clean and rebuild the tiller carburetor

Rebuild kits are available for most carburetors. The kit contains the essential components such as jets, pins, seals and gaskets to overhaul the carburetor. You can sometimes fix a fuel supply problem by disassembling and cleaning a carburetor. Use the rebuild kit to rebuild the carburetor after cleaning it.

Replace the tiller carburetor

Over time, varnish from stale gasoline builds up in the carburetor, decreasing the amount of air/fuel mixture reaching the engine. Replace the carburetor if it's severely clogged with varnish or if the orifices are clogged with debris and can't be cleared using carburetor cleaner and compressed air.

Tune up the tiller engine

A tune-up restores the tiller engine to its peak operating condition. A tune-up includes changing the oil, cleaning the engine, replacing the air filter, checking the ignition system, inspecting the carburetor, adjusting the throttle and choke controls, and adjusting and lubricating all moving parts.