,
OPERATORS MANUAL
FZ63
Fig.1
48
97.4
20
Valve Cover Screws
SPECIFICATIONS
Bore
Stroke
Weight (engine)
(muffler)
Practical rpm
26.2mm
19.0mm
460g
33g
2,000-15,000rpm
31
High Speed needle Valve
Check Valve
（
A
）
Fuel Filter
Low Speed needle Valve
（
B
）
FEATURES
The FZ63 is the most powerful 4 cycle engine of its size and was developed for sport flying as well as power demanding acrobatics.
• Supercharged system
• Fuel injected
• Regulated and pressurized fuel system
• Muffler
The pressurized fuel and injection system makes throttle response superior and is unaffected by tank level.
GLOW PLUG
Select the most appropriate plug from those designed specifically for
4 cycle engines. Glow plug selection greatly affects the maximum engine output and low idle. We recommend the YS #4.
INSTALLATION
l.
Connect the engine to the tank as shown in fig.1. Since high pressure is applied to the tank, tighten all connections carefully. Care must be taken to prevent pressure leakage due to under tightening of the check valve or by kinking the fuel lines.
2. Always use a fuel filter. We recommend the YS fuel filter.
3. Match the direction of the check valve arrow fig.1 with the arrow facing to wards the tank.
PROPELLER INSTALLATION
Due to the high torque of the FZ63 engine, we have equipped it with a double lock system for safety.
1. Mount the propeller and tighten the rear nut. Next, tighten the front nut as shown in Fig.1.
2. Select a good quality propeller that will turn in the 9,000 to 12,000 rpm range. We recommend sizes 11x7-11x9,12x6-12x8.
START UP
1. Remove tube B from the filter: remove tube A from the check valve,then fill the tank. (CAUTION: If tank is filled or under pressure remove tube A first, then tube B. Fuel will eject if tube B is removed while the tank is pressurized. )
2. Open the needle valve 2 l/2 turns from the fully closed position.
3. Open the throttle fully and slowly turn the propeller 10 times. This primes the system by pressurizing the tank and sending fuel to the carburetor.
4. Close the throttle to the idle position and connect the glow plug battery.
The engine is now ready for starting.
DO NOT ATTEMPT TO START FULL THROTTLE,
AS THIS IS VERY DANGEROUS.
BREAK IN
To maximize engine performance and increase durability, please follow this break-in procedure: l.
Use the same size (or slightly smaller) propeller than you intend to use in flying.
2. Use a good quality fuel which contains 15-30% nitromethane and oil content of 20-24%. Synthetic or castor oil can be used, or a combination of synthetic and castor.
Do not use four cycle fuel due to low oil content.
3. The needle valve should be set so that the engine is running at a rich setting. Run the engine approximately 20 minutes with this setting.
4. Mount the engine to the model and fly ten times with this setting.
This concludes the break-in procedure, it is advisable to always use a slightly rich setting to keep the moving parts lubricated, even after the break-in period .
HIGH SPEED ADJUSTMENT
1. Adjustment of high speed is done by the carburetor needle valve.When
the needle valve is turned clockwise, the mixture is leaner.When it is turned counterclockwise, the mixture is richer. A good starting position for the high speed needle valve is 2 1/2 turns open from the fully closed position.
2. When the engine is started, open the throttle gradually. Next, find the peak position (highest RPM) by adjusting the needle valve. Then the needle valve should be opened approximately 1/8 of a turn from full
RPM to achieve best performance. The engine may stop if the throttle is opened to full immediately after starting. Wait until the engine temperature rises and then open the throttle slowly .
3. For flying, it is advisable to use a slightly richer mixture setting. By using a richer mixture, the engine temperature is maintained and RPM stability improves.
LOW SPEED ADJUSTMENT
This engine is equipped with a new low speed needle valve to adjust the mixture from low to mid throttle. This needle valve is located on the side of the throttle barrel opposite the throttle arm (Fig.1).
1. Open the low speed needle to 1 turns from fully closed position.
2. The low speed needle valve should be set after the high speed needle valve has been adjusted. Close the throttle gradually to a idle
(approximately 2500rpm). Let it idle for 20 to 30 seconds and then slowly advance the throttle. The adjustment is satisfactory at low speed if transition is smooth at this time.
3. If the engine is running rough on idle, the low speed mixture is rich.
If the engine starts to speed up and dies on idle or starts to detonate, when advancing the throttle, the mixture is lean. Turn the low speed needle valve clockwise to richen and counterclockwise for a leaner mixture (note that the direction of the low speed needle valve is opposite the high speed needle valve). Adjustments to the low speed needle valve should be 1/8 to 1/4 of a turn increment at a time to achieve smooth throttle response.
IMPORTANT! The regulator adjusting screw on this engine is factory set. No further adjustments are necessary. If for some reason you have to disassemble the regulator assembly, the regulator adjusting screw should be set flush with the regulator body.
TAPPET CLEARANCE ADJUSTMENT
1. Tappet clearance is factory preset. No adjustment is necessary until after 1 hour of operation (including break-in period).
2. Clearance adjustment should be done when the engine is cool. When the engine temperature is high, clearance is higher due to thermal expansion.
3. The proper clearance setting should be at 0.04-0.1mm. The adjustment is achieved by loosening the locknut (fig.2) and turning the adjusting screw. Tighten the locknut after the adjustment is achieved. Alter the initial 1 hour adjustment, this procedure should be performed a few every 2 hours of use.
Fig.2
0.04 - 0.1mm
CAM GEAR TIMING ADJUSTMENT
If for some reason you have to disassemble your engine, please follow these important steps on reassembling the cam gear.
1. Remove the carburetor and backplate assembly. Notice the impression made on the crankshaft counterweight. Position it directly straight down or in line with the case outer seam line.
2. When reinstalling the cam gear, the side with a point mark should be facing the opening of the gear box. Note that it should also be mounted with the point mark located towards the top of the engine just below the cam followers.
DIAPHRAGM AND CHECK VALVE DISASSEMBLY
Diaphragm
1. Remove the adjustment screw of the valve, and then remove the inside valve and spring.
2. Clean the inside with alcohol or appropriate cleaner. Reassemble.
3. Screw in the regulator screw until flush with the diaphragm body.
Check valve
1. Open the valve by rotating the body counterclockwise.
2. Reassemble the check valve carefully.
IMPORTANT! Silicone rubber is used in many parts of the YS engine.
Use only glow fuel or methanol for cleaning. Gasoline and other volatile solutions will damage the silicone if used.
# PART # DESCRIPTION QTY
Crankcase
Cylinder Head Assembly
Cylinder Head & Liner
Intake Valve
Exhaust Valve
Valve Spring Set
Spring Retainer Set
Valve Spring Retainer Clips
Cylinder O-ring
Head Screws
Valve Cover
Valve Cover Gasket
Valve Cover Screws
Intake Pipe
Intake Pipe O-ring
Crankshaft
Rear Bearing
Front Bearing
Front Bearing Oil Seal
Drive Washer
Drive Washer Retainer
Propeller Washer
Propeller Nut Set
Piston
Piston Ring
Wrist Pin
Wrist Pin Retainer
Rocker Arm Set
Tappet Adjusting Screw Set
Tappet Adjusting Lock Nut
Rocker Arm Shaft
Rocker Arm Screw
1
E Ring Set
Cam Gear
Cam Gear Cover
Cam Gear Cover O-Ring
Cam Gear Screws
Cam Gear Bearing Set
Cam Followers Set
Push Rods
Push Rod Covers
Push Rod Cover O-Ring
Con Rod
Back Plate Assembly
Back Plate
Disc Valve
Disc Valve Pin
Disc Valve Set Screw
Back Plate Gasket
Back Plate Screws
Carburetor Assembly
Carburetor Body
Throttle Barrel
Throttle Barrel Seal
Thorottle Barrel Retainer
Throttle Arm Set
Throttle Stop Screw
Throttle Stop Spring
Needle Valve Assembly
Needle Valve
Needle Valve O-ring
Needle Soket
Needle Soket O-ring
Needle Valve Detent
Fuel Nipple
Low Speed Needle Valve
Low Speed Needle Valve O-Ring
Carburetor Gasket
Carburetor Screws
Regulator Assembly
Regulator Body
Regulator Adjusting Screw
Regulator Adjusting Screw O-ring
Diaphram
Regulator Plunger
Plunger Spring
Regulator Screw Set
Muffler Set
Muffler Assembly
Exhaust Pipe
Rock Nuts
Gasket Set
O-Ring Set
2
3
11
1
1
1
1
1
1
1
2
1
1
1
1
1
4
1
2
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
2
2
2
2
1
1
2
1
2
4
1
1
1
2
2
2
2
1
1
2
1
1
1
1
1
1
1
2
1
2
1
1
1
1
4
2
4
1
2
1
1
49 F5149
50 F5150
F5151A
51 F5151
52 F5152
53 F5153
54 R6124
55 F1260S
56 F1258
57 F1259
F5158S
58 F5158
59 F1546
60 F1555
61 F1256
62 F1557
33 F1217
34 F5134
35 F5135
36 F5136
37 F1234
38 F5138
39 F5139
40 F5140
41 F5141
42 F5142
43 F5143
F5144A
44 F5144
45 F5145
46 F5146
47 F1229
63 F5163
64 F5186
65 F5187
66 F5164
67 F5165
F5166A
68 F5166
69 F1245
70 F1246
71 F5169
72 R6138
73 F5171
74 F5172
F5173S
75 F5173A
76 F5174
77 F5175
F5180
F5181
17 F5117
18 F5118
19 F5119
20 F5120
21 F5121
22 F5122
23 F5123
24 F6124
25 F6125
26 F6126
27 F5127
28 F5128
29 F1213
30 F1214
31 F5131
32 F5132
1 F6101
F6102A
2 F6102
3 F5103
4 F5104
5 F5105
6 F9106
7 F9107
8 F5108
10 F5110
11 F5111
12 F5112
13 F5113
14 F5114
15 F5115
16 F6116
'00 04
WARRANTY
Strict quality control is implemented by our factory in all phases, from parts manufactiring to final assembly.
If performance deteriorates or a part fails within one year of purchase due to a manufacturing error,YS will repair or replace the engine at no charge. Warranty will not cover normal wear.
Should the engine be modified, incorrectly assembled or abused, there will be a normal charge for parts and labor. The use of four cycle fuel due to low oil content will also void warranty.
YAMADA MFG.CO.,LTD
67 Tsuchitori Inuyama Aichi 484-0917 JAPAN
