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7

ignition System

Saito gasoline four-stroke engines come with Saito’s 
own ignition system composed of the ignition unit, 
cord for sensor (black, red and white ), insulated 
plug cap, and cord for battery (black and red).  
(Battery not included.)

You will also need to secure an ON/OFF switch  
(safety switch system). The switch must carry a  
rating of 3 amps. Be sure to mount the ignition 

system in a location near the engine and away from 
the receiver to prevent any unwanted interference.

Please refer to the diagram below. Saito  
recommends the use of a 5-cell Ni-Cd, Ni-MH 
battery with a voltage of 6V, or 2-cell Li-Po  
battery with a voltage of 7.4V and rated to a  
minimum 1000mA.

Cord for plug(mesh)

Plug cap

Sensor

Battery

Cord for 
ignition sensor

Cord for
Tachometer display

Cord for battery

Switch (capacity
more than 3A)

Unit

Battery

Voltage [6–8V]
(5-cell Ni-Cd/Ni-MH or 2-cell Li-Po)

Capacity: more than 1,000mA

Using Propeller Size to Decrease Fuel consumption

Selecting the correct propeller for your engine and 
airframe maximizes both the performance of your 
aircraft and the life of your engine.

• Select a propeller that maximizes the engine RPM 

at full throttle.

• Install the engine on an aircraft that performs at 

90% of the maximum RPM range. For example, 
select a propeller for the FG-21 that turns  
approximately 9,000 RPM at full throttle.

• Install the engine and propeller in an aircraft that 

performs at 8,100 RPM. 

If the propeller diameter or pitch is too large, you 
will need to richen the air-fuel mixture, increasing 
the fuel consumption. If the propeller diameter or 
pitch is smaller, the air-fuel mixture will be leaner, 
decreasing the fuel consumption.

Summary of Contents for FG-17

Page 1: ...Owner s Operating Instruction Manual Saito 4 Stroke Gasoline Engines Model FG 17 FG 21 Version 2012...

Page 2: ...damage to the product or other property This product is not intended for use by children without direct adult supervision Do not attempt disassemble use with incompatible components or augment produc...

Page 3: ...h as screwdrivers pencils etc in your pockets when operating your model engine These could fall into the propeller Never allow fuel to come into contact with eyes or mouth Gasoline and other fuels use...

Page 4: ...If it is damaged replace the propeller with a new one If the propeller hits something while the engine is in operation immediately stop the engine and check for damage Start the engine on a flat surf...

Page 5: ...Stroke Engines Saito four stroke gasoline engines were developed to satisfy a market need for a more cost effective and cleaner answer to glow powered engines Ever at the forefront of technology Saito...

Page 6: ...d approximately 20 subsequent flights FG 17 FG 21 14 x 8 15 x 6 15 x 10 15 x 6 16 x 6 16 x 8 16 x 6 17 x 6 3 Blade 15 x 7 15 x 9 Engine Ground RPM 8 500 9 200 Engine Ground RPM 8 300 9 000 Diameter x...

Page 7: ...tion sensor Cord for Tachometer display Cord for battery Switch capacity more than 3A Unit Battery Voltage 6 8V 5 cell Ni Cd Ni MH or 2 cell Li Po Capacity more than 1 000mA Using Propeller Size to De...

Page 8: ...the airframe Fully charge the ignition battery Be sure to use a safety on off switch from the battery to the ignition WARNING Do not let people stand in front of or to the side of the engine while at...

Page 9: ...ed and that the plug socket cap is fitted in place and fastened down properly Properly position the ignition sensor at the bottom of the engine crankcase Install the throttle servo at a distance of 8...

Page 10: ...n 3 Press the electric starter against the spinner to clear any excess fuel 4 Move the throttle to a high idle position Power the electronic ignition on and attempt to start the engine again If the en...

Page 11: ...mm FG 17 Dimensions and Specifications 25 34 23 23 5 42 6 36 68 5 161 56 127 5 71 5 2 5 40 E C E C 26 30 5 56 5 60 M12x1 0 M8x1 25 35 52 127 104 5 22 5 71 8 31 18 3 31 7 4 4 2 4 4 2 Manufacturing Code...

Page 12: ...m FG 21 Dimensions and Specifications 64 5 4 4 2 60 52 135 3 102 5 71 8 32 8 31 5 32 18 40 25 4 26 8 17 43 2 40 M8 x 1 25 76 5 178 26 2 35 8 64 5 74 5 139 50 50 25 13 7 Manufacturing Code Engine bed t...

Page 13: ...13 FG 17 FG 21 Exploded View...

Page 14: ...haft G1723 G2023 27 Taper Collet Drive Flange G1727 G2127 28 Prop Washer Nut 125A28 125A28 30 Prop Nut for Electric Starter 120S30A 120S30A 31 Crankcase Screw Set 5031 5031 32 Engine Gasket Set G1732...

Page 15: ...edle Valve Extension 5086 5086 87 Throttle Barrel Assembly G1787 G2087 88 Throttle Lever 5088B 5088B 89 Idle Needle Valve 130T809 G2089 90 Carburetor Screw Spring Set G1790 G2090 91 Carburetor Gasket...

Page 16: ...MMERCIAL LOSS IN ANY WAY REGARDLESS OF WHETHER SUCH CLAIM IS BASED IN CONTRACT WARRANTY TORT NEGLIGENCE STRICT LIABILITY OR ANY OTHER THEORY OF LIABILITY EVEN IF HORIZON HAS BEEN ADVISED OF THE POSSIB...

Page 17: ...rifying the proof of purchase date Provided warranty conditions have been met your Product will be serviced or replaced free of charge Service or replacement decisions are at the sole discretion of Ho...

Page 18: ...tings or running conditions dust insufficient cooling improper mounting improper propeller size or lack of balancing etc Damage due to improper disassembly Modifications of any kind Repair or replacem...

Page 19: ..._____ Owner s Name_ _ _______________________________________________________________ Street Address_________________________________________________________________ City State Zip_ _ ________________...

Page 20: ...2012 Horizon Hobby Inc Distributed exclusively by Horizon Hobby Inc Saito is a trademark of Saito Seisakusho Co Ltd Japan www horizonhobby com Created 02 2012 32925...

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