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Motoculture: start

A small flywheel is enough to start small single cylinder (even Diesel). (Non-contractual photo, does not necessarily reflect the drawing)

Only high-end machines or high-end machines are equipped with an electric starter, especially when it comes to a diesel engine.

Inertia launcher

All small portable and moderately powered tools start with an inertia launcher. It is driven by a rope whose end carries a handle.
The launcher consists of a flying or drum on which is wound the rope. It has a motor drive shaft, fitted with a non-return device. It's about

  • either a ratchet wheel (analogous to the clinker or freewheel device) for low power appliances,
  • more frequently a helical spline shaft that recoils as soon as the engine is running.

The drum is in a housing inside which is a coil spring ensuring the return of the launch rope. This spring is fixed by its inner end to a lug, a hook or a small stud inside the starter wheel, while its outer end is retained by a hook located inside the starter housing.
To start the engine, after opening the petrol supply and making sure that the candle is connected,
  • gently bring the handle back until you feel the first compression;
  • then pull quickly and continuously after stalling the machine with the other hand (chainsaw, brush cutter) or foot (mower).

It is absolutely necessary to avoid partial maneuvers in successive jolts, each maneuver of the launching rope to be carried out thoroughly. When the engine is cold, it is recommended to first gently pull the rope of the launcher thoroughly to promote the intake of fuel mixture in the cylinder. Do this once, then start the engine normally.

Anatomy of a tiller launcher

Anatomy of a tiller launcher

Electric starter

On high-end machines, the engine is started by an electric starter. The hardware price supplement covers not only the starter but also the battery, charging circuit or charger.
Starting up by foot pitcher (Kick), similar to motorcycle starters, only exists on a few riding mowers and gives way to the electric starter. It consists of a universal "winding-series" motor, the windings of its stator and its rotor being connected in series. This type of engine offers the advantage of giving a very high torque as soon as it is turned on.
Its engine does not directly attack that of the machine. On those of high capacity, it is coupled with a launcher (the Bendix) which meshes with a gear with special teeth. The latter slides on the starter shaft and engages the ring gear of the flywheel of the engine, when the electric motor of the starter has acquired a certain speed. This assembly, classic on cars, is hardly retained on gardening equipment that beyond a significant power (more than 10 ch approximately) and especially for diesel that require a larger start torque.
Most often, the electric motor is coupled to the engine via a reducer. On small monocylinders, this coupling is often permanent; as soon as the engine is running, it drives the starter motor, which then behaves as a generator and recharges the battery. This is why small thermal engines are said to be equipped with dynamo-starters.

Difficulty starting

The inability to start the engine is the most common incident on small machines. To identify the organ, follow the procedure below:

  • first check the fuel level and check that the throttle is in the "start" position. However, after four or five unsuccessful attempts, it must be brought back to a median position to avoid drowning the carburetor;
  • unscrew the spark plug, check the gap between the electrodes and the absence of moisture.
Connect its power wire and have its thread on the cylinder head (as a precaution, hold it with a cloth or a well-insulated glove); check that it emits a spark.

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