SAITO FG-33R3 (01) PDF MANUAL

SAITO FG-33R3 (01) PDF SUMMARY:

What is the needle reference position after initial break-in?

• Main needle: Approx. 1+1/4~1+1/2 turns CCW from fully closed.
• Slow needle: Approx. 8 turns CCW from fully closed (Then throttle valve should be fully closed).

Do the needles need to be adjusted after initial break-in?

Yes. Actually, the best position of the needles vary depending on the prop, temperature, humidity and so on. Please adjust as necessary after observing the engine performance during flight.

What is the peak adjustment procedure?

• 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 the main needle at the peak at that time. ( How many turns you did CW based on the reference value).

What is the slow needle adjustment procedure?

• 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.

What is the pre-flight/flight adjustment procedure?

• 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.

What fuel should be used?

• The fuel is mixture of regular gasoline or high-octane gasoline and high-quality 2-stroke engine oil.
  • Examples of oil recommendations:
    • 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.

What is the ignition arrangement?

Place the main unit as far from other electrical devices as possible.

How do you install the plug cord?

Insert the plug cap of (1) Plug cord deeply into the plug of #1 cylinder to make sure it will not come off. The other caps and plugs should be installed by the same way. (Refer to cylinder # on the reverse side).

What should you connect the sensor cord with?

Connect with the cord from the sensor attached to the engine.

What type of battery should be used?

Use a fully charged battery that has adequate spec. (6-8.4V, 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.

What should the tachometer cord be connected to?

Connect the digital tachometer (Option). Otherwise the connector is normally vacant.

What is the recommended propeller?

APC17x6. Larger size or greater pitch can cause engine broken due to overload.

What type of propeller should be used?

Use a well-balanced one. Never use the propeller that has been scratched or damaged even if slightly.

How often should the propeller bolts be tightened?

As the propeller is compressed slightly, tighten the 6 bolts every hour of operation.

What are the steps for breaking in the engine?

• Prop-recommendation : APC-17×6.
• 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.

When should the valve clearance be checked and adjusted?

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.

What are the steps for adjusting the tappet?

1. Remove the spark plug and rocker arm covers of #1 cylinder. Then turn the prop CCW by hand to place the piston at TDC of compres-sion stroke.
2. Loosen the lock nut and adjust the gap by hexago-nal wrench until you get the correct gap (below pic) for both of intake & exhaust.
3. Once the gap is set, tighten the lock nut and attach the plug and covers. Do the same adjustment for the #3-#2 cylinders in order.
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.

What should you do if the plane gets dirty from the exhaust?

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

What could happen if you use an unreliable or unbalanced prop?

Use a reliable and well-balanced prop. Otherwise it may cause an abnormal vibration and could result in a serious accident.

Why should you check and tighten the engine screws occasionally during operation?

During operation, all engine screws can loosen due to metal heat expansion. Check and tighten occasionally.

What should you do if the exhaust valve gets dull by carbon or sludge?

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.

What precautions should you take to avoid disturbing others?

Pay attention to the surroundings so as not to disturb others by noise and exhaust.

Where should spectators stand when the engine is operating?

Always keep spectators stand behind the engine when operating the engine.

What precautions should you take to avoid breathing in exhaust smoke?

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

When should you move to the rear side of the aircraft?

Pay attention not to touch the rotating propeller when starting engine, and move to rear side of the aircraft once the engine is started.

Who is responsible for the use of the engine?

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.

What should you do if there is a deficiency from the factory concerning manufacture?

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.

What is the warranty on the ignition system?

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.