Cylinder Compression; Engine Oil And Filter Replacement; Spark Plug - Gilera SATURNO BIALBERO 350 Workshop Manual

CYLINDER COMPRESSION

Warm up engine.
Stop engine and remove spark plus (remove tank if necessary).
Insert compression gauge (19.1.20524) in spark plug hole. Turn throttle
fully open and turn engine over with the electric starter until the gauge
measures the highest value.
Low compression may be caused by:
Incorrect valve clearance
Head gasket leak
Worn piston or rings
High compression may be caused by carbon deposits in the combustion
chamber.

ENGINE OIL AND FILTER REPLACEMENT

The engine oil replacement must be carried out with engine warm.
Remove the oil level and filter cap (fig. 9).
Loosen the oil drain plug (fig. 10) on the bottom left side of the engine,
then remove it carefully so as not to damage the mesh filter on it. Let the
oil drain completely.
Clean and blow out the mesh filter and then remount it and pour 2 litres of
oil into the filler cap.
Check oil level.
Start the engine, then stop it after an idle period of approx 1 minute.
If necessary, add some oil and check for leaks.
Every two oil changes, it is necessary to replace the filter cartridge .
Remove filter cartridge using appropriate tool 19.1.20520 (fig. 11).
Install new filter after lubrication of its gasket with engine oil.
The correct oil level is reached with 2.2 litres of new oil.
Recommended oil: AGIP SAE 15W/40 or AGIP SINT 2000.

SPARK PLUG

Disconnect spark plug cap and remove spark plug.
Check the spark plug and verify that the insulation isn't cracked or
chipped.
Measure spark plug gap with feeler gauge; adjust gap by bending the
electrolyte carefully if necessary. Gap 0.6 ÷ 0.7 mm
Recommended spark plug
Champion A5YC
(alternatives: NGK DPR9EA9, DRP9EV9, Nippon Denso X27 EPRU-9,
X27 EPRZU-9
Make sure the seal washer is in good condition. Install the spark plug and
tighten by hand, then finish tightening with a spark plug socket to the
correct torque (12-15 Nm); reconnect spark plug cap.
MAINTENANCE 3 - 4
3 - 4,1