Os-engines FS-120S III Manual de usuario descargar pdf (Pagina 10)

Make sure there is adequate ventilation.

The function of the various tubes connected to the engine and

tank (see sketch) are as follows:

For Pipe A (tank to pump) use similar heavy-duty silicone-

rubber tubing of approximately 2.5mm bore and 5.0mm

outside diameter.

To draw fuel from tank to pump nipple marked 'IN'.

To deliver fuel from pump nipple marked 'OUT' to

carburettor.

To connect crankcase breather nipple (behind

camshaft housing) to intake pipe.

To deliver crankcase pressure pulses to pump dia-

phragm.

Pipe A:

Pipe B:

Pipe C:

Pipe D:

Note:

Since the FS-120S3 has a positively pumped fuel

supply, it does NOT require muffler pressurization.

Pipes B, C and D are already installed when the engine is

shipped from the factory. If any of these pipes should

need to be replaced, due to damage or installation

problems, be sure to use tubing of the same dimensions

and quality as the originals.

CARE OF FUEL PUMP & REGULATOR

A short preliminary period of part-throttle running is required

to ensure that the pump system functions correctly during the

running-in process. Set the throttle 75% open from the fully-

closed position and run the engine for 2-3 minutes. This will

ensure that the engine becomes rich enough when the

needle-valve is opened at full throttle during running-in.

Important

FUEL LINE

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Os-engines FS-120S III Manual de usuario Pagina 10