“FLASH 100” OWNER’S MANUAL REL . 2.0
___________________________________________________________________________
©
Copyright by
FLY
Products
s.r.l.
Page
14
Fuel
Use super gasoline and synthetic oil at 2%
Avoid of use mixture already prepared from the distributor. A mixture prepared from much time could
reduce performances and damage your motor. If possible prepare mixture yourself and use it until a
couple of weeks.
We suggest to avoid fuel v-power or fuel that improve the number of octane.
3.4.1
Carburetor Adjusting
Standard carburetor setting
When purchased, the motor has a standard carburetor setting and testing.
To modify, this one must adjust the two screws of the carburetor. The
screw on the right marked with a
L
(low) regulates the entrance of fuel at
the low speed (the range of the accelerator from zero to half).
The screw on the left marked
H
(high) regulates the air fuel mix higher
speeds.
It is extremely important to both maximum engine efficiency and engine
life, to understand and keep in tune your carburetor setting.
There are two fuel to air carb setting which function in the following
manner:
L
screw adjust: rotate (clockwise until completely closed).
Now carefully open the screw counterclockwise between
1/3
and
1/2
turn (
turning the screw out in the counterclockwise direction enrich the mix/fuel
to air ratio). This is the standard factory setting for
L
.
With the
H
(meaning High rpm) screw follow the same procedure and
turn it clockwise until full closed.
Now paying close-attention, open the H screw between
1
and
1 +1/4
turn to arrive at the standard
factory setting.
Keep in mind that these setting are extremely sensitive and the total sum of all adjustment you make to
the screw should not exceed ¼ of a turn. Increments of 1/10
th
of a turn are already sufficient to change
engine performance.
In particular be careful not to run your machine at the “too poor” of a fuel to air-mixture, as this can
result in possible overheating and engine damage due to lack of cylinder lubrication.
Pay much attention to the carburator setting at the maximum since if this mixture is too poor, it can
result in engine damage. No damage is done if the setting is too rich. Therefore, when in doubt, it is
better to have carburation, at the maximum rpm, somewhat more on the rich side.
A verification of carburation can be done after the engine has run 20-30 minutes checking of the
colour of the spark plug electrode. If the electrode is brown the carburation is correct. If is grey, its
poor and if its is black its rich.
Attention: If the carburation should happen to be difficult to adjust by listening to engine runs, this
means that the fuel tube is absorbing air from the pump (in this case is better to change it) or else from
the connections between the tank and the carburator. The air bubbles are easily seen, while the engine
is running they are seen passing through the tube.
Fig. 23 –
H
/
L
screws settings
