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The gasoline must have an octane number that is not lower than 95, in order to
avoid pre-ignition phenomena.
Carefully mix the fuel oil in a tank is appropriate and it is better, once mixed, to use
it within one week.
Do not use vegetable or animal oil.
DO NOT MIX DIFFERENT TYPES OF OIL. We do never recommend using Castrol TTS
Oil. No guarantees by using this oil will be applied.
CARBURETOR
The carburetor Walbro WB37, if used properly, provides excellent performance
requiring few tuning interventions. However, changes in weather conditions,
altitude and a possible change of the propeller (in both size and pitch) can affect its
functioning.
The carburetor requires an adjustment during the testing phase with a standard
setting
• Screw H "affects the entire range of use of the engine”. From completely
tightened, loosen by 1 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.
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