For the capacity , refer to the data and select the best of commercial product. Please be sure to use a filter with weight. To avoid
entrain any impurities to the carb, piping with “Fuel feeding pipe” and “Air inhalation pipe” (Fig.3) is recommended.
*Please be sure to use “gasoline-proof” products for the tank lid rubber, piping, and tubing. Some of the products for glow fuel
canʼt be used for gasoline. Please check carefully if thereʼre any crack on the piping, tubing, connection, and tank.
All of the connection parts should be bound by thin Nylon strap or wire to avoid fuel leakage or air induction to the fuel line. (If
there are any leakages, the performance of the engine decreases dramatically.)
*The tank should be placed within the range of 200mm from the engine center to the tank center. When performing an acrobat
with a large change in fuel level or that requiring an excessive movement of throttle, the tank must be placed at a position close
to the engine as much as possible.
*When provide “Air inhalation pipe” as Fig.3, arranging the tube above the fuel level (Fig.4) is the effective way of fuel leakage
prevention.
5. Spark plug
SAITO SP-1 spark plug is the standard equipment. Dimensions are as follows;
Hexagon width: 8mm Screw size: UNEF 1/4-32
Reach (with a washer): 5.5mm Spark-gap: 0.4-0.5mm
For replacement, please specify “SAITO SP-1”.
Since our four cycle engine uses a mixed gasoline, please decide the numbers of flights by yourself and clean the spark plug.
Please replace when it is degraded. (Consider the plug as consumable).
-2-
2. Fuel
The fuel is mixture of commercial regular gasoline and reliable oil for 2-stroke. (Unleaded high-octane gasoline is not
necessarily required for SAITO engine.)
[Example of oil]
・ Klotz KL-200 Original Techniplate
・ Deluxe Materials PowerModel 2T-S etc.
For the mixture ratio, please be sure to use “gasoline : oil =20 : 1” or richer by volume ratio.
(ex. 1000ml of gasoline should be mixed with more than 50ml of oil ).
Any damage caused by the fuel used, in which the oil ratio is lower than 20:1 ratio, is not warranted.
Since gasoline is dangerous material, be careful of its storage, use, and transport enough. (The evaporative emission and
exhaust smoke of gasoline have a harmful effect on a human body. Also, if gasoline is leaked, there is danger of fire etc.)
Please note that we take no responsibility for accidents, health damages, etc which occur during storage, use and transport of
gasoline.
3. Fuel Filter and fuel pump
Since commercial gasoline has many impurities, please be sure to use a reliable filter
for the admission port of the gasoline-proof fuel pump (Fig.2), and in the fuel tank as
well (Fig.3). Without using a filter, the performance of the carburetor is not delivered,
resulting in failures.
Using optional part “Filter with weight” is highly recommended.
4. Fuel tank and piping
Gasoline-proof tube
（Option）
（Option）
Filter with weight
Gasoline-proof
Pump
Fig.2
Fig.3
Center of fuel tank
Within 200mm (close as possible)
Fire wall
Engine center
Fuel tank(100~150cc)
Gasoline-proof tube
Filter with weight
Air inhalation
pipe
Fuel feeding pipe
to Carb nipple
Rubber cap for gasoline-resistant
Fuel level
above
Fuel level
to Outside of
the fuselage
Fig.4
Air inhalation pipe
6. Ignition system
*Be careful of possibility of electrical shock as it generates high voltage.
*The unit includes a plastic clip to hold the connectors and spiral tube to protect each wire.
The ignition system is designed to match SAITO 4-stroke gas-engines with automatic advancing system.
However this ignition system is designed to be an anti-noise product, please isolate it completely from the receiver, servo, and
battery to avoid a radio-interference trouble. Moreover, it is desirable to utilize a noise filter (line filter). Especially, each switch
(for Ignition and for Receiver) should be isolated and set far from each ones.
Caution: A gas-engine generates a noise which has an adverse effect on RC adjustment. Please be sure to carry out a noise
check each time while the engine is running before flight. Since a noise which occurs during flight may lead to a large-scale
accident, please carry out a noise check without fail. As a simple method, after starting engine you can check by removing
the antenna of the transmitter and operate it about 50m away from the airplane. If there is no malfunction, it is normal.
