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FUEL
The SIMONINI 250 engine has been designed to operate with a gasoline/oil mixture.
We recommend using synthetic oil, remains mixed with gasoline in the tank for a
longer period. It grants good lubrication and longer life to engine components.
During the running-in stage, use an oil percentage of 2,5% and then move to 2% once
the stage has been completed.
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.
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 turns or 360 °.
• 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 °
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