6. CARBURETOR ADJUSTMENT
7. ENGINE BREAK-IN
8. SERVICING
to a position near the idle position before starting the next flipping
(If the engine is started while the throttle is wide open, a great
thrusting force is produced, which is very dangerous).
• Be sure to wear a thick glove when flipping the propeller. Use all
fingers, except thumb, for the flipping operation.
How to Stop the Engine
For stopping the engine, the black lead wire from the coil should be
grounded to the engine body, or the throttle valve should be closed
completely.
The carburetor is provided with 3 adjust screws which are set to
the best (approximately) positions by our company, but they may
need a little adjustment depending on the temperature,
atmospheric pressure (altitude), etc. of the area where the engine
is used. Start the engine without making any adjustments. Make
readjustments only when the engine shows any mal-functioning.
1.Standard opening of each needle as follows;
Low speed needle: 1
1
/8 ±
1
/4
High speed needle: 1
3
/8 ±
1
/4
Idle Screw: Turning this screw clockwise increases the idling
R.P.M. Turning it counterclockwise decreases the
idling R.P.M
Low speed needle: This is the fuel adjust screw (not the air
screw). Turning this needle clockwise makes the
mixture gas leaner and turning it counterclockwise
makes it richer.
High speed needle: Turning this needle clockwise makes the
mixture gas leaner and turning it counterclockwise
richer. Set this needle at a position which is 1/4
open from the maximum R.P.M. position while the
airplane is on ground.
[ NOTE ]
1.Do not tighten the High and Low Speed needles too firmly.
2.When the unit has just started and the engine is not warm
enough, there may be insufficient acceleration and the engine
may be stopped. Be sure to perform idling before operation.
No specific break-in is required. The engine is gradually broken-in as it is used and the output is also increased gradually.
The engine can be disassembled or reassembled without any
specific difficulties, but be careful of the following matters;
a.For disassembling, the special tools shown in the parts list are
required in addition to the general tools. Be sure to use a new
gasket when the crankcase and cylinder have been
disassembled.
b.Removing rotor
1.Screw in the stopper (P/N 3350-96220) in place of the spark
plug. Then turn the rotor counterclockwise until the piston
touches the stopper. Take care it can cause damage to the
piston or connecting rod if the stopper is not screwed in to
the bottom.
2.Loosen and remove the rotor securing nut.
3.Remove the rotor by using the puller (P/N 1490-96101). Do
not hit on the crankshaft by a hammer, that can increase the
runout of the shaft.
c.Assembling crankcase
1.Apply grease on the oil seal lips and oil on the bearing.
2.Assemble the crankshaft with a new gasket.
3.When both front and rear crankcases are tightened, the
portion of gasket protruding on the cylinder mounted surface
should be cut off with a knife until the gasket becomes flush
with the cylinder mounted surface.
d.Assembling piston
Before assembling the piston, apply the oil on the small end
bearing and piston, and set the piston ensuring that the arrow
mark on the top of piston is directed toward the direction of
exhaust port.
e.Assembling cylinder
1.Coat the oil on the inner surface of cylinder.
2.The piston is provided with a knock pin which stops the
piston ring from turning. Set the splitted section of piston ring
at the knock pin and assemble the cylinder ensuring not to
break the piston ring.
f. Adjusting air gap of coil.
The air gap of coil should be adjusted to 0.3 mm (0.01").
g.Adjusting ignition time.
This engine with the point-less C.D.I. type requires no
adjustments of ignition time.
9. SPECIFICATIONS
Specifications are subject to change without notice.
MODEL ZENOAH G230PU ZENOAH G230PUH ZENOAH G230PUM
PURPOSE Airplane Helicopter Boat
TYPE Air cooled Water cooled
DISPLACEMENT 22.5cc
BORE × STROKE 32mm × 28mm
COMPRESSION RATIO 8.6 : 1
MAXIMUM OUTPUT 1.95PS/10500rpm [ 1.80PS/10500rpm ] 2.25PS/11000rpm
OPERATING ENGINE SPEED 2000~10000rpm 3000~11000rpm 3500~15000rpm
IGNITION SYSTEM CDI type Flywheel magneto
CARBURETOR WALBRO WA197A WALBRO WA167A WALBRO WA167A
AIR CLEANER Dry type
STARTING Hand flip Recoil starter
FUEL 2-cycle oil pre-mixed gasoline ( Mix ratio 25~40:1 )
SPARK PLUG NGK BMR7A or CHAMPION RCJ4
DRY WEIGHT [ ✽ with standard muffler ] 1.42Kg [ ✽1.58Kg ] 1.49Kg [ ✽1.65Kg ] 1.45Kg
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