Vittorazi Motors Easy100 Owner's Manual page 10

If you choose to verify the carburetor setting proceed in this way: close completely the
screw L and H and then exactly open them with the standard setting. Remember: a
strong pressure (tightening) on these screws can irremediably damage the carburetor.
A simple verification of the carburation can be effected, following these indications.
After having started the motor in safety and warmed-up for some minutes (see
paragraph for starting and warm-up) can be done in the ground a control of the
carburation.
- The motor has to maintain a constant idle and not to have the tendency to go off or to
flood.
- When you pull the throttle fastly from the idle rpm, the motor has to immediately
answer without going off or a lack of power.
- Simulating a cruise flight (about 1/4 or 1/3 of throttle), the motor will have to answer
with a regular thrust, smooth and not with hiccups or jumps of power.
- With max speed or max number of rpm (full throttle), the thrust has to be constant.
Attention: if the carburation of the motor (the quantity of gasoline that arrive to the
motor) is poor, therefore the opening of the screw is lower in comparison to the
indications of the chart, will probably occur breakups as seizures, overheatings,
fusions of the piston, precocious usury of the components.
Problems to the motor owed to a lack of oil in the gasoline or a wrong mix oil-
gasoline, impurity in the fuel or a not correct carburation, are not recognized by the
warranty. See paragraph warranty 12.3.
A check of the carburation can be made, analysing the color of the electrode of the
spark. A first control can be done, at the end of the of break-in period, in the following
way:
- If the electrode is brown the carburation it is correct.
- If the electrode is grey or clear the carburation is poor and you have to immediately
seek the cause, with the help of an authorized dealer/instructor.
- If the electrode is dark brown color or black the carburization is rich.
Watch out for the regulation of the screw H, because if this is too closed in comparison
to suitable values, you could have damages to the motor. Any damage will occur if the
carburation of the screw H is too opened (rich). In the doubt, therefore, is everytimes
better to have a carburation rich for the screw H.
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