• This manual describes the engine. For its mounting and control, see the instruction
manual for a model plane.
• This engine is designed for use on the model plane. If it is used for any other
purpose, we cannot be responsible for its reliability or safety.
• Use genuine parts for replacement.
• Check the propeller every time. If it is damaged replace it with a new one.
• If the propeller hits something while the engine is in operation, immediately stop
the engine and check it.
• Start the engine on flat surface without pebble stones.
• Never modify the flywheel.
• Check the flywheel. If it is damaged, replace it with a new one.
• When mixing the fuel, or operating the engine, carry it out in a well-ventilated place.
Make sure that the engine is mounted on the aircraft grade plywood with more than 10mm of
thickness or a mount of equivalent strength and is firmly fixed with 4 bolts.
[ NOTE ]
1. Be sure to set flat washers or metal plate on the reverse side of the mount to prevent
bolts from sinking into the mount. Before flying the air-plane, be sure to check for loose
bolts.
2. The mounting bolts should be screwed into the crankcase within 8 ~ 12 mm of depth.
3. Since this engine is equipped with a float-less carburetor with a diaphragm pump, the
direction of cylinder and position of fuel tank can be freely selected.
1. Recommended prop size.
The recommended prop sizes are as shown in the table bellow.
This engine produces the maximum output when the engine is running at about
8,500rpm. Be sure to use a propeller which makes the engine speed approximately
7,000 ~ 9,000rpm while the airplane is flying. When using a propeller of small diameter, a
light weight propeller is not suitable.
2. There are two types of propeller mounting bolts; L=45 and L=50. Select the proper type
of bolt depending on the thickness of propeller used and the use of the spinner.
[ NOTE ]
1. When mounting a thin propeller, cut off the end of bolt or add a flat washer.
2. When mounting the spinner, set a pin on the hub with more than 3 mm of diameter, thus
preventing slipping.
Mix gasoline and 2-stroke oil at a mixing ratio of 25 ~ 40 :1.
4. Fuel
3. Propeller
2. Mounting
1. Safety Precautions
2
Diameter x Pitch (in.)
20 x 7 ~ 10, 18 x 8 ~ 12
