7
Operation (continued)
High-Speed Needle: Turning this needle clockwise makes
the gas mixture leaner, and turning it counterclockwise
makes it richer. Set this needle at a position which is 1/4
open from the maximum rpm position while the aircraft is
on the ground.
Note: Do not tighten the high and low speed
needles too tightly.
When the engine has just started and is not warm
enough, there may be insufficient acceleration and
the engine may die. Be sure to allow the engine to
warm up at idle for a few minutes before conducting
normal operation.
Recommendations
To extend the life of your Zenoah
®
engine, the following
is recommended:
1. Use an Evolution quality 2-stroke oil mixed at 32 to 1.
2. Use the recommended spark plugs.
3. Use the proper propeller size and balance the
propeller prior to use.
4. Always adjust the engine to a slightly rich setting.
5. For long-term storage, make sure there is no fuel
left in the tank or the engine. Remove the spark plug(s)
and apply several drops of high-quality oil (e.g., Marvel
Air Tool Oil) to the top of the engine and into the spark
plug hole. Rotate the crankshaft several times. Store the
engine in the box it came in or on the airplane with the
nose down in order to keep oil in the bearings.
Servicing the Engine
Required Tools
• Regular screwdriver
• Phillips screwdriver
• Hexagonal wrench (4mm/
5
/
32
")
• Open wrench (19mm/
3
/
4
")
• Plastic hammer
• Thickness gauge
• Tapered round rod
• Liquid gasket (Permatex or equivalent)
• Threadlock (Blue Threadlock Z-42 or equivalent)
• Lithium grease
• Engine oil
• Washing gasoline
• Brush
• Scraper
• Cloth
The engine can be disassembled or reassembled without
any specific difficulties, but note the following:
For disassembling, the special tools shown in the parts
list are required (stopper, puller assembly), in addition
to general tools. Be sure to use a new gasket when the
crankcase and cylinder have been disassembled.
Note: Because the crankshaft is of the assembly type,
do not disassemble, hit or twist its end.
Disassembly
1. Dismount the engine from the model.
2. Remove the carburetor and insulator carefully without
damaging the gasket.
3. Remove the muffler.
4. Remove the spark plug and ignition module.
5. Remove the propeller hub.
6. Remove the rotor (flywheel). If it cannot be detached,
use a plastic hammer and tap the part lightly.
a. Screw the stopper in place of the spark plug,
then turn the rotor counterclockwise until the piston
touches the stopper. Take care, as it can cause dam-
age to the piston or connecting rod if the stopper is
not screwed into the bottom.
b. Loosen and remove the rotor securing nut.
Engine Care and Maintenance
(9 Seiten)
(31 Seiten)
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