Zenoah G26 AIR - Manual (Page 7)

7
Operation
(continued)
High-Speed Needle: Turning this needle clockwise
makes the gas mixture leaner, and turning it counter-
clockwise 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 a Zenoah quality 2-stroke oil mixed at 32 to 1.
2. Use the recommended spark plugs.
3. Use the proper propeller size and balance the pro-
peller 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 in to the bottom.
b. Loosen and remove the rotor securing nut.
Engine Care and Maintenance