Instructions for SAITO FA-120R3 (AAC) 4-Stroke Engine
We would like to express our sincere thanks for your purchase of the SAITO FA-120R3 engine. Please read our instructions carefully and treat your engine with care. If there’re any manufacturing defects, SAITO Seisakusho co., ltd. will make necessary repairs free of charge. You are requested to strictly avoid disassembling the engine since assembled with the use of special tools and jigs to assure perfect construction.
In the case of breakage or trouble, if encountered due to crash or others, please send the engine to our service station.
Please notice that our guarantee will not cover any breakage or trouble on the engine caused by your disassembling or modification.
Please refer to the following data.
Principal outside dimensions |
Explosion order |
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(1-3-2) |
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Prop rotational direction |
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1 |
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3 |
2 |
Cylinder numbers viewed from the rear
Mechanism of 4-Stroke Engines
The 4-Stroke engine provides 4 individual piston movements as illustrated below. The “Stroke” means the piston movement from the Top Dead Center to the Bottom Dead Center. In the 4-Stroke engine, one cycle of operation in change of gas state inside the cylinder and valve movement are completed at every 4 strokes of piston that is every 2 revolutions of the crankshaft. Formally the engine is called the 4-stroke one-cycle engine.
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Bore |
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22.4mm×3 |
Weight |
Approx. 890g (with mufflers) |
Propeller |
Standard APC13"×8"-14"×6" |
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Stroke |
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16.2mm×3 |
Practical Speed |
1,800-10,000rpm max range on the ground: 8,500-9,500rpm |
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Stroke volume |
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19.18cc |
Static thrust |
Approx. 3.5kgf (by APC14"×6"prop) |
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Fuel flow |
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24cc/min (At full throttle, Fuel of synthetic oil with 15% of nitro content,APC13"×6"prop at approx 9,400rpm) |
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*Fuel flow varies depends upon prop load. More fuel flow with larger load and less fuel flow with smaller load. |
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Unique features of SAITO FA-120R3
•Optimum for small-size scaled airplane
•Low vibration (assured by constant-interval explosion)
•Real sound of the exhaust.
•The engine is designed to equalize fuel mixture and minimize misfire due to insufficient distributing at idling by means of special port type intake manifold originally developed by SAITO.
•Cylinder head: Improved semi-spherical combustion chamber assures better combustion efficiency and volumetric efficiency.
•Cylinder: The aluminum cylinder is directly hard-chrome plated on its inner surface without installing liners to reduce weight and increase durability. The monolithic structure of cylinder head and cylinder prevents distortion and improves cooling efficiency.
•Piston: The piston is made of high silicon content aluminum and attached with a compression ring to heighten engine performance.
•Crankshaft: Has a forged solid construction made of chrome molybdenum steel, and supported by two ball bearings.
•Cam: Features high cam providing longer maximum lift time.
•Carburetor: High-performance of slow throttling type.
•Propeller nut: designed to have double nuts preventing loosening and fall-off for the safety.
StandardAccessories
1. Wrench for tappet adjusting screw |
1 pc. |
5. Glow plug [SAI-GP01, P-SS] |
3 pcs. |
2. Limit gauge (0.1t) for tappet adjusting |
1 pc. |
(Attached to the engine) |
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3. Hexagonal wrench (1.5mm) |
1 pc. |
6. Plug heating connector set |
1 set |
4. Muffler complete |
1 set |
(3pcs. of red cord, 1pc. of black, 2pcs. of fixture) |
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