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it within one week.
Do not use vegetable or animal oil.
DO NOT MIX DIFFERENT TYPES OF OIL. We do never recommend to use Castrol TTS
Oil. None guarantee by using this oil will be applied.
CARBURETOR
The carburetor Walbro WB39, if used properly, provides excellent performance
requiring few tuning interventions. However, changes in weather conditions,
altitude and a possible change of the propeller (both in size and pitch) can affect its
functioning.
The carburetor is adjusted during the testing phase with a standard setting
• Screw H "affects the entire range of use of the engine”. From completely
tightened, loosen by ¼ turns or 450 °
• Screw L “only has as effect at a low engine speed”. From completely tightened,
loosen by ¾ turns or "270 °"
Given the fact that the first test is performed at an altitude of 750 m above sea level,
you may need to depart from this setting without the adjustments exceed the limit:
• screw-H do not fall below a round "360 °"
• Screw L do not fall below ½ turn "180 °"
The carburetor is equipped with a depression pump to remove fuel from the tank,
but do not exceed the height difference between them as it has not exceed to 50-
60cm. The same applies to the tube: Do not exceed 50-60cm.
You may inserted a manual pump between the tank and carburetor, to make the
mixture reach the carburetor before the start, avoiding stress to the starter.
CARBURATION
NB: in this paragraph the words "MIXTURE" indicates the union of the two elements (AIR) + (OIL
/GASOLINE) which takes place inside the carburetor.
Weather conditions or altitude changes have influence to the operation of the
engine as it varies the air density and, consequently, changes the mix ratio between
the element AIR and the element OIL /GASOLINE.
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