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SPECIFICATIONS

FIG.2

TAPPET CLEARANCE ADJUSTMENT

1.  Tappet clearance is factory preset. No adjustment is necessary unit 

after 1 hour of operation(includiing 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 loosing the locknut (FIG.2) and turning 

the adjusting screw. Tighten the locknut after the adjustment is 

achieved. After the initial 1 hour adjustment, this procedure should 

be performed after every 2 hours of use.

CAMGEAR TIMIING 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. 

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.

WARRANTY

   Strict quality control is implemented by our factory in all phases, from 

parts manufacturing to fi nal assembly. If performance deteriorates or 

a part fails due to a manufacturing error, YS 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 modifi ed, incorrectly assembled or abused, 

there will be a nomal charge for parts and labor. The use of four cycle 

fuel due to the low oil content will also void warranty. 

Bore 

      

        30.4mm

Stroke 

 

        24.8mm

Displacement 

          18cc

Weight 

 

          730g

Practical rpm 

 2,000-13,000rpm

FIG.1

PROPELLER INSTALLATION

  Due to the high torque of the FZ110S engine, we have equipped it 

with double locknuts 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 8,000 to 

11,000rpm range. We recommend sizes 14x11-12, 15x10-11

START-UP

1.  Remove tube(B) from the fi lter, remove tube(A) from the check 

valve, then fi ll the tank.

     Caution: If tank is fi lled or under pressure remove tube(A) fi rst; 

then tube(B). Fuel will eject if tube(B) is removed fi rst while the 

tank is pressurized.

2.  Open the needle valve 1 1/4~1/2 from the fully closed position.

3.  Open the throttle fully and slowly turn the propeller ten turns. This 

primes the system by pressurizing the tank and sending fuel to 

the carburetor.

4.  Pour several drops of fuel into the carburetor.

5.  Close the throttle to the idle position and connect the glow plug 

cord. The engine is now ready for starting.

Do not attempt to start at full throttle, as this is very dangerous.

BREAK-IN

 To maximize engine performance and increase durability, please 

follow this break-in procedure:

1.  Use the same size (or slightly smaller) propeller than you intend to 

use in fl ying.

2.  Use a good quality fuel which contains 15-30% nitromethane and 

an oil content of 15-20%. Synthetic or castor oil can be used, or 

a combination of synthetic and caster. 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 fl y 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 high speed needle 

valve. When it 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 1 1/4 turns open from 

fully close position.

2.  When the engine is started, open the throttle gradually. Next, fi nd 

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 unit the engine temperature rises and then open the throttle 

slowly.

3.  For fl ying, 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  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 3 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 2300rpm). 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.

Bore 

      

        30.4mm

Stroke 

 

        24.8mm

Displacement 

          18cc

Weight 

 

          730g

Practical rpm 

 2,000-13,000rpm

FEATURES

   

The FZ110S is the most powerful 110 four cycle engine available. 

This engine offers many exclusive features that have been proven on 

other YS engines.

    Supercharged system with simplifi ed structure to keep weight to a 

minimum while still retaining maximum effi ciency.

    Air chamber that uses crankcase pressure coupled with a double 

throttle valve system which allows a bigger charge of fuel and air 

mixture to enter the intake valve for more power.

    Fuel injection system for superior throttle response. This system is 

unaffected by tank position or by the attitude of the model.

GlOW PLUG

    

Select the most appropriate glow plug from those designed 

specifi cally for 4 cycle engines. Glow plug selection greatly affects 

the maximum engine output and low idle. If RPM's decrease or stop 

when the booster cord is removed, replace the plug. 

We recommend YS #4 (P0040) or OS  Type F.

INSTALLATION

1

.  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 

undertightening of the check valve or by kinking the fuel lines.

2.  Always uses a fuel fi lter ( not included ). We recommend the YS 

fi lter ( 6720 ).

3.  Match the direction of the check valve arrow to FIG.1, with the 

arrow facing towards the tank.

YS  FZ110S

OPERATOR'S  MANUA

L

0.04-0.1mm

Rocker arm

Rock nut

Adjusting screw

Check valve

Fuel filter

Tube (B)

Tube (A)

Regulator

High speed needle

Low speed needle

Regulator screw

Throttle stop screw

Front nut

Rear nut

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