User Manual

Note:
●As it uses oil mixed fuel, plane sometimes may get dirty by exhaust.
●Use reliable and well balanced prop, otherwise it cause abnormal vibration and may result in serious accident.
●During operation, the screws all over the engine can be loosen by heat expansion of metal. Tighten them up
occasionally.
●When the exhaust valve gets dull by carbon or sludge especially in cold atmosphere, remove the rocker cover
and apply some anti-rust spray to the exhaust valve to help the valve to move smoothly.
●All responsibilities for the use of the engine, and other obligations and responsibilities based on laws, regula-
tions, etc. are borne by the purchaser and the user, and SAITO SEISAKUSHO CO., LTD. is exempt from any
responsibilities.
Warranty:
●If there is any deficiency from the factory concerning manufacture, please consult the shop or distributor you
bought from, so that our company will repair them with responsibility. Any failure or trouble caused by unnec-
essary disassembly, modification, or other uses than those provided in the instruction manual is not subject to
the warranty.
Φ37.2mm x 2 28mm x 2 60.9cc
D2123 x P10xP11
・Filter with weight [G36-154] ・Durable tube for Gasoline (1m) [G36-155]
・Aluminum spinner nut [57T-30] ・Tappet adjusting kit [120S-161] ・Digital tachometer [G17-167]
Bore
Main body : 2,090g / Muffler : 100g / Ignition : 170g
Stroke Disp.
Weight (Approx.） Practical speed
Approx.1,500-7,400rpm Max on ground Approx. 6,200-7,400rpm
Propeller CM-6Plug
Optional parts
Gasoline 50㏄ classApplications
Battery for ignition system Voltage:6-9V, higher then 1,000mA (2C Lipo or 5C NiMH)
・Limit gauge (0.1t) for tappet adjustment 1pc ・Spanner for tappet adjusting lock nut 1pc ・Carburetor adjustment bar 1pc
・Spark plug[CM-6](Attached to the engine) 2pcs ・Muffler set 1set ・Choke bar 1pc
・Ignition system（w/sensor） 1set ・Muffler bracket 1set ・Plug wrench 1pc
・Stand off mount 1set ・Anti-loosening nut 1pc ・Hexagonal wrench 1set
Specifications
FG-61TS Instruction Manual
4. Needle reference position (Set After Break-in)
●Main needle：Approx.2.53 turns from full close
●Slow needle：Approx.45 turns from full close（Then throttle should be fully closed）
●Actually the best condition of the needle varies depending on the prop, temperature, humidity and so
on. Please adjust seeing the engine performance during flight.
5. Tappet adjustment
The valve clearance should be checked and adjusted after Break-in and every after 2 hours while the
engine is cold. Before adjusting tappet gaps, tighten up the screws around cylinders etc.
1. Remove the spark plug
and rocker arm covers of a
cylinder. Then turn the
prop CCW by hand to
place the piston at TDC of
compression stroke.
2. Loosen the lock nut and
adjust the gap by hexago-
nal wrench until you get
the correct gap (Right pic)
for both of intake &
exhaust.
3. Once the gap is set,
tighten the lock nut and
attach the plug and
covers. Then do the same
adjustment for the other
cylinder.
4. Turn the prop by hand to
check if the compression
is enough. If the gap is less
than 0, the valve is always
opened sightly and lose
compression. Then adjust
again.
Correct Gap
Must not be inserted
Close to 0 with no limit
Limit gauge
(0.1mm)
2. Ignition
●Ignition arrangement- Place the main unit as far from other electrical devices as possible.
(1) Plug cord（meshed high tension cord)
2 cords compatibile for left/right cylinder. Insert the caps
deeply into plugs to make sure they wont come off.
(2) Sensor cord
Connect with the cord from the sensor attached to the
engine.
(3) Battery cord (black / red cord)
Use a fully charged battery that has adequate spec. (6-9V,
more than 1000mA is recommended.). Between the battery
and main unit, make sure to set a heavy duty switch whose
capacity is higher than 3A.
(4)Tachometer cord
Connect the digital tachometer (Option). Otherwise the
connector is normally vacant.
Plug cap
Switch（more than 3A）
Sensor
(2)Sensor cord
(1)Plug cord
Mail unit
(3)Battery
cord
(4)Tachometer cord
Recommended battery
Voltage : 6-9.0V
Capacity : 1,000mA
3. Method of choke（No need when you use starter）
●In advance, make a thin hole on the cowling to insert the choke bar /
slow needle adjustment bar.
●When choke, be sure to turn off the switch of the ignition system.
●As shown in the fig, pass the choke bar (with M3.5 thread on its tip)
thorough the hole on the cowling. Then turn the bar to insert into the
M3.5 internal thread at the center of the throttle lever.
●Pull the choke bar and fix it with a clip or clamp with full throttle as
shown in the fig so that it may not go back to the previous position.
●Grasp the prop by hand and turn it to the forward direction (CCW) for
several times, until the carburetor generates hissing-like sound. After
hearing this sound for about 5 times, quickly flick the prop by cracking it
some 10 times. Then choking is done.
●After that, remove the choke bar. After that, power on the ignition system and flick the prop quickly to start the engine.
If the engine doesnt start, repeat the choking procedure.
Cowling
choke bar for insert
M3.5 screw
Throttle lever
Throttle valve
（Move to the left）
Slow needle
choke bar
Temporary fixed
by a clip
For CCW
Make rich
Main
needle
For CW
Open
Throttle
lever
Slow needle
CCW
Rich
CW
Lean
Main needle
Throttle
lever
1. Fuel
●The fuel is mixture of commercial regular gasoline and reliable oil for 2-stroke engines.
●[Example of oil recommendation]
・ Klotz KL-200 Original Techniplate ・ Morgans Cool Power 'Blue' Synthetic Lubricant etc.
●Be sure to use the mixture gasoline : oil =1520 : 1 by volume ratio. (Ex. 1000ml of gasoline should be mixed
with more than 50ml of oil ).
●In Break-in process, use 15:1 mixed fuel to ensure the best lubrication for initial run.
●Any damage caused by the fuel used, in which the oil ratio is lower than 20:1 ratio, is not warranted.
●Do not use gasoline ethanol mixed. It may cause not only power loss but also corrosion inside the engine.
Firewall
Stand off mount
Cut out
Fuel tank
Fuel
level
To outside
Air inhalation pipe
To Carb nipple
Fuel feeding pipe
Air inhalation
pipe
Rubber cap for
gasoline-resistant
Gasoline-proof tube
Filter with weight
Set the canter
of the carb
slightly upper than fuel level
Close as possible
Standard
accessories
3. Break-in MOST IMPORTANT!!
●Prop-recommendation : APC-22x10 for Break-in.
●Use 15:1 oil mixed fuel for Break-in.
●Never make the fuel mixture lean during Break-in.
It could cause seizure even during idling or low speed running.
●Before start the engine, open the main needle Approx. 3 turns
open from full close.
●Start the engine (using a starter is recommended for safe).
●Run for about 10 seconds in low speed to warm up.
●Open throttle gradually up to over half open, in the meantime open the
main needle some turns. Continue to open the main needle until the
speed drop and gets dull, where the throttle opened over half.
●If it cannot make rich by opening by main needle (rpm doesnt drop),
then open slow needle too.
●Run in this very rich condition for 2 tanks.
SAITO SEISAKUSHO, CO., LTD.
www.saito-mfg.com
22-7, 3-chome, Tokagi, Ichikawa-shi, Chiba prefecture 272-0024, Japan Phone: [phone] FAX: [phone]
FG-19R3 Instruction Manual
All specifications and models are subject to change without notice.