OPERATOR’S MANUAL

(Helicopter Engine)

Fig.1

Low Needle

High Needle

43.5mm

Hover Needle

25mm

Fuel Filter

Tube (B)

SPECIFICATIONS

Bore 27mm

Stroke 27.5mm

Displacement 17.75cc

Weight

Practical rpm

580g

2,000 ~17,000

Factory Set

Do Not Adjust

FEATURES

The 96SRX Tareq is the latest in helicopter engine technology from YS.

●

●

●

New stroke design for superior operation

New carburetor design for easier adjustments.

Factory preset fuel regulator.

CAUTION

Using gear ratios higher than 9.0 to 1 may result in engine damage from overspeed.

GEAR RATIO

You should be using an engine to main rotor gear ratio of 1-7.5 to 1-8.4. Please check with your helicopter manufacturer to obtain the correct gear ratio.

INSTALLATION

1. The fuel lines should be connected to the fuel tank

as shown in the above figure. Be careful to install the

check valve in the correct direction. Since the tank is

exposed to high pressures, be sure that all conne-

ctions are tight to prevent pressures leakage.

2. Since the engine is sensitive to dirt in the fuel, a fuel

filter must be used. (We recommend the 6720 fuel

filter.)

Check Valve Tube (A)

Tube (C) 3 15/16"(10cm)

3. Tube(C) should be set exactly at 3 15/16” or (10cm)

between the engine and check valve. DO NOT use

any other type of check valve. The check valve is

designed exclusively for the 96SRX.

4. Adjust your throttle linkage and curve using the align-

ment indentations on the carburetor body located on

the throttle arm side of the carb body.

PLEASE NOTE that the hover position is at 40% see

FIG 2.

START UP

1. Always remove Tube(A) at the check valve first

before fueling. The fuel tank is pressurized and you

need to relieve the pressure first. Disconnected

Tube(B) at the filter and fill the tank. Reconn-

ect Tube(A) and (B).

2. From the fully closed (clockwise) position, turn the

needle valves counter clockwise as follows.

STARTING SETTING / OPERATING SETTING

●

Hover 1.75~2.0 open / 1.50 ~1.75 open

●

Low 1.25 open / 0.50 ~1.0 open

●

Full 1.50~2.0 open / 1.0 ~1.50 open

3. Close the throttle to the idle position and connect the

glow plug driver. The engine is now ready for starting.

BREAK-IN

It is not necessary to mount this engine on a set stand for break-in. However, the engine should be adjusted slightly on the rich setting for the first few flights to insure proper break-in. Always use a good quality fuel which contain 15 ~30% nitromethane and an oil content of 18

~23% low viscosity oil.

NEEDLE VALVE ADJUSTMENT

Idle, Hover and High needle valves all work the same way. Turning the needles clockwise lean the fuel mixtures and turning them counter clockwise make the fuel mixtures rich.

1. Set needles as described in START-UP.

2. Start the engine and check idle. Adjust as needed.

3. Lift helicopter into a hover and check for the correct

rotor RPM recommended by the kit manufacture.

Once this is done take note of the amount of smoke

being produced by the muffler. The mixture is correct

for hover when there is a steady stream of smoke be-

ing produced.

4. Land the helicopter for approximately 20~30 seconds.

Lift the helicopter into a hover again taking note of the

transition from idle to hover. If the engine exhibits a

large amount of smoke and the throttle response is

sluggish, you will need to adjust the idle and or the

hover needle leaner to achieved a smooth transition.

If the engine detonates and the smoke is inconsis

tent or a small amount is produced, the mixture is too

lean.

Fig.2

High speed 100%

Low speed 0%

5. The high speed needle refines the fuel mixture for

forward flights without affecting the hovering adjust-

ment. After the engine is started and warmed up, lift-

off into a hover and check that the engine is running

smooth with a good trail of smoke. If everything is fine,

open the throttle and enter forward flight. Take note of

the amount of smoke like we did in a hover adjustment.

It is correct when you see a noticeable steady smoke

trail. Adjust the high-speed needle valve to obtain

slightly rich but consistent setting.

STOPPING THE ENGINE

1. Fully close the throttle barrel to stop the engine.

2. As soon as the engine stops running, be sure that a

fuel line clamp is used in Tube(B) to prevent fuel from

flowing into the engine.

3. On the final flight of the day, the fuel line clamp

should be used to stop the engine in order to prevent

rust and corrosion.

FUEL AND GLOW PLUG

Fuel _ Nitro 15-30% Oil 15-25%

Glow Plug _ YS #2 Enya #3 OS #8

IMPORTANT!

Silicone rubber is used in many parts of the YS engine.

Use only glow fuel of methanol for cleaning. Gasoline and other volatile solutions will damage silicone if used.

WARRANTY

Strict quality control is implemented by our factory in all phases, from parts manufacturing to final assembly.

If performance deteriorates or a part fails due to a manufacturing error, YS engine will repair or replace the engine at no charge in the period of one year from date of purchase. Warranty does not cover normal maintenance.

Should the engine be modified, incorrectly assembled or abused, there will be a normal charge for parts and labor.

Hover 40%

NO.

PART# DESCRIPTION

1 R7001 Crankcase

2 R8002 Cylinder Head

3 S9103 Head Gasket

4 S5104 Head Screws

5 R8005 Cylinder Liner

6 R7006 Piston

7 S9107 Piston Ring

8 S7108 Wrist Pin

9 S5208 Wrist Pin Retainer

10 S5110 Con Rod

11 R8011 Crankshaft

12 R6211 Front Bearing

13 S9113 Rear Bearing

14 S1014 Drive Washer Spacer

15 R6217 Propeller Nut

16 R8016 Back Plate

17 S9117 Back Plate O ring

18 R6120 Back Plate Screw

19 S3019 Carburetor Body

20 S5120 Carburetor Gasket

21 S3021 Throttle Barrel

22 R6124 Throttle Barrel Retainer

23 S4125 Hover Needle Valve

24 F1546 Hover Needle O Ring

25 F1555 Hover Needle Seat

26 F1556 Hover Needle Seat O Ring

27 S5128 Needle Detent

28 S8130 High Speed Needle

29 F1546 High Speed Needle O Ring

30 S5131 Low Speed Needle

31 S8133 Low Speed Needle O Ring

32 F1260S Throttle Arm

33 S7132 Carburetor Screws

34 S5135 Carburetor Subplate

35 S7134 Regulator Subplate

36 S8138A Regulator Assy.

37 S7136 Diaphragm

38 S7140 Regulator gasket

39 S7139 Regulator Screws

40 S7144 Check Valve

S9143 Gasket Set

S9119S Carburetor Assy.

S9146 O ring set

R8005S Piston / Ring / Liner Set

S4125S Needle Valve Assy.

2

1

1

2

1

1

1

1

1

1

1

1

2

1

1

1

2

1

1

1

1

1

4

1

1

1

1

1

1

1

1

1

1

1

1

2

QTY

1

1

1

6

32

2016 MAR

21

19

20

34

22

15

14

12

9

8

26

25

27

24

27

29

28

30

31

23

7

38

35

37

36

39

33

4

2

3

9

6

10

5

1

13

11

17

16

18

40 http:// www.yspower.co.jp

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