Saito FG-33R3 User Manual

	FG-33R3 Instruction Manual										ver. Aug, 2018
Specifications
Bore		Ø27.0mm	Stroke	19.2mm		Disp.		32.98cc		Applications	2st Gas-engine 20~30cc class
Weight (Approx.		Body:1,440g / Mu ers: 90g / Ignition system: 200g				RPM Range		Approx.1,700-9,500rpm		Max on ground	Approx. 8,000-9,000rpm
Propeller		D16” x P8” ~D17” x P6”	Plug	1/4-32 spark plug		Battery for ignition system			Voltage:6-12V,greaterthan1,000mA(2-3S Li-Po or 5S NiMH)
				SP-1or SP-2
		Limit gauge (0.1t) for	tappet adjustment		1pc		Plug wrench			1pc
Standard		Spanner for tappet adjusting lock nut			1pc		Hexagonal wrench 1.5mm 1pc
accessories		Spark plug [SP-2](Attached to the engine)			3pcs		Mu er set			1set
		Ignition system w/ sensor			1set
Optional parts		Filter with weight [G36-154] Rubber tube for gasoline(1m) [G36-155]
		Aluminum spinner nut [120S-30] Tappet adjusting kit [30-161] Digital tachometer [G17-167]

1. Fuel

●The fuel is mixture of regular gasoline or high-octane gasoline and high-quality 2-stroke engine oil. ●[Example of oil recommendation]

Klotz KL-200 Original Techniplate Deluxe Materials PowerModel 2T-S 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 ). ●During the break-in process, use 15:1 mixed fuel to ensure the best lubrication for initial running.

●Any damage caused by the fuel used, in which the oil ratio is lower than 20:1 will not be covered by warranty. ●Do not use gasoline containing ethanol. It may cause not only power loss but also corrosion inside the engine.

	Fuel filler line		Vent line
		Gasoline-compatible	Fuel Level
	Vent line	tank stopper
		Fuel Tank
	Set the center of the carb
	slightly above the fuel level
	Fuel supply to carburetor
Hollow out	Gasoline-compatible tubing
	Close as possible	Filter with weight	To Outside of the plane

	2. Ignition	Plug Cap
	●Ignition arrangementPlace the main unit as far from other electrical
	devices as possible.	(1) Plug Cord	Main Unit
	(1) Plug cord(meshed high tension cord)		SwitchCapacity:3A
	Insert the plug cap of (1) Plug cord deeply into the plug of #1 cylinder
	to make sure it will not come o . The other caps and plugs should be		(2) Sensor cord
	installed by the same way. (Refer to cylinder # on the reverse side)
	(2) Sensor cord	(3) Battery Cord
	Connect with the cord from the sensor attached to the engine.
	(3) Battery cord (black / red cord)	(4) Tachometer Cord
	Use a fully charged battery that has adequate spec. (6-8.4V, more than
	1000mA is recommended.).Between the battery and main unit, make	Sensor	Battery
	sure to set a heavy duty switch whose capacity is higher than 3A.
			Voltage: 6-8.4V
	(4)Tachometer cord		Capacity: : 1,000mA
	Connect the digital tachometer (Option). Otherwise the connector is normally vacant.

3. Propeller

●Recommended propeller is APC17x6. Larger size or greater pitch can cause engine broken due to overload. ●Use a well-balanced one. Never use the propeller that has been scratched or damaged even if slightly. ●As the propeller is compressed slightly, tighten the 6 bolts every hour of operation.

4. Break-in MOST IMPORTANT!!

●Prop-recommendation : APC-17x6. ●Use 15:1 fuel:oil ratio for break-in.

●Never make the fuel mixture lean during break-in. It could cause seizure even during idling or low-speed running.

●Before starting the engine, open the main needle Approx. 1+1/2 turns from fully closed. ●Start the engine (using a starter is recommended for safety).

●Run for about 30 seconds at low speed to warm up.

●Open throttle gradually up to full. In the meantime turn the main needle CCW. Continue to turn the

main needle CCW until just before engine stops keeping the throttle opened fully. ●Run in this very rich condition for 1 liter of fuel.

●Now “initial” break-in is done.

Throttle	Main
Full open	Needle

CCW to make

rich

5. Adjustment of carburetor after initial break-in.

Needle reference position (Set after initial break-in)

●Start the engine after adjusting the needle to the following reference value.	Main needle	Slow (Idle) Needle
●Main needle Approx. 1+1/4~1+1/2 turns CCW from fully closed	CW→Lean	(Adjust with screw driver)
●Slow needle Approx. 8 turns CCW from fully closed (Then throttle valve	CCW→Rich	CW→Lean
		CCW→Rich
should be fully closed)		Slow
●Actually, the best position of the needles vary depending on the prop,	CCW→Rich
temperature, humidity and so on. Please adjust as necessary after observing
the engine performance during flight.

Peak adjustment	CC→Lean	Throttle lever	High
●After starting the engine, warm up for approx. 30 seconds at low speed.
●Achieve the peak at full throttle.

→Turn the main needle CW gradually to the position where the RPM is greatest (the peak). Continuing to turn the needle CW past the peak could lead to seizure so turn it slowly and carefully. If the RPM suddenly decreases after passing the peak, instantly turn the main needle CCW to again increase the RPM. Otherwise it could damage the engine seriously.

●Once achieving peak RPM, return the throttle to low speed. Make a note of the position of main needle at the peak at that time. ( How many turns you did CW based on the reference value. )

Slow needle Adjustment

●After achieving peak RPM, next is slow needle adjustment. Open the throttle from low RPM to full throttle quickly.

●Turn the slow needle CCW slightly if the engine hesitates for a moment or stalls before the engine reaches max RPM because the mixture is too lean.

●Turn the slow needle CW slightly if the engine is slow to reach peak RPM (full throttle set) because the mixture is too rich.

●Adjust the slow needle as above until the RPM follows the throttle movement smoothly. The important point is to adjust the slow needle AFTER the main needle has been adjusted to its peak.

●Now break-in at ground level is done. Adjust tappets by the method described later.

Pre-flight / Flight adjustment

●When the slow needle adjustment is done, check the response by revving up from low speed to full throttle quickly several times.

●Open the throttle fully and turn the main needle CCW approx. 60 90 degrees from the peak position. This is to make the fuel mixture richer in the air where the RPM get higher than on the ground.

●After all adjustments are made, fly your aircraft and fine tune the engine according to the situation. Basically tuning should be done with the main needle. Readjustment of the slow needle is rarely needed if the first adjustment of the slow needle has been done successfully.

6. Tappet adjustment

The valve clearance should be checked and adjusted after break-in and every time after two hours while the engine is cold. Before adjusting tappet gaps, tighten the screws around cylinders etc.

1. Remove the spark plug and	2. Loosen the lock nut and	3. Once the gap is set, tighten	4. Turn the prop by hand to check if
rocker arm covers of #1	adjust the gap by hexago-	the lock nut and attach the	the compression is enough. If the
cylinder. Then turn the prop	nal wrench until you get	plug and covers. Do the same	gap is less than 0, the valve is
CCW by hand to place the	the correct gap (below pic)	adjustment for the #3-#2	always opened sightly and lose
piston at TDC of compres-	for both of intake &	cylinders in order.	compression. Then adjust again.
sion stroke.	exhaust.

Top Dead Center	Loosen the lock nut	Adjust the gap turning	Tighten the lock nut
The state both valves are closed)
		the set screw	to fix the set screw

Note:

Correct Gap

Close to “0” with no limit

Limit gauge

(0.1mm)

Must not be inserted

●As it uses oil-mixed fuel, the plane may sometimes get dirty from the exhaust.

●Use a reliable and well-balanced prop. Otherwise it may cause an abnormal vibration and could result in a serious accident. ●During operation, all engine screws can loosen due to metal heat expansion. Check and tighten 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.

●Pay attention to the surroundings so as not to disturb others by noise and exhaust. ●Always keep spectators stand behind the engine when operating the engine.

●As exhaust smoke is harmful, be careful not to breathe in or otherwise expose yourself to its harmful e ects.

●Pay attention not to touch the rotating propeller when starting engine, and move to rear side of the aircraft once the engine is started. ●All responsibilities for the use of the engine, and other obligations and responsibilities based on laws, regulations, 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 with the shop or distributor you bought from. Our company will be responsible for repair. However, any failure or trouble caused by unnecessary disassembly, modification, or other uses than those provided in the instruction manual is not subject to warranty.

●Ignition system is subject to the warranty only for initial failure. Once the system has been activated successfully, it will no longer be subject to warranty.

All specifications and models are subject to change without notice.

SAITO SEISAKUSHO, CO., LTD. www.saito-mfg.com

22-7, 3-chome, Tokagi, Ichikawa-shi, Chiba prefecture 272-0024, Japan Phone: [phone] FAX: [phone]