Saito FG-21 4-Stroke

Saito FG-21 4-Stroke

Specifications

Saito FG-21 4-Stroke 1-Cylinder Gasoline Engine
Benchmark Prop: APC 16 x 6 @ 8800 rpm
Bore: 32.0 mm
Carb Type: 2-needle Saito pumped carb
Crankshaft Threads: M8 x 1.25 mm
Cylinder Type: AAC
Cylinders: Single
Displacement: 20.52 cc
Engine (Only) Weight: 690 g
Ignition Weight: 113 g
Muffler Threads: 13mm
Muffler Type: Cast screw-on
Muffler Weight: 83 g
Plug Type: 1/4-32 Spark Plug 
Prop Range: 15 x 8 to 16 x 8 2-blade; 14 x 9 to 15 x 7 3-blade
RPM Range: 2000-9500
Recommended Fuel: Gasoline
Stroke: 26.0mm
Total Weight: 0.89 kg

 

Before starting the engine, inject a suitable amount of engine oil into the lubrication nipple on the crankcase using a syringe or pump while turning the propeller by hand and the valves clearance should be checked !!!

Oil: Stihl HP Ultra oil at a mix ratio of 15:1 - 20:1 (15:1 ratio required for break-in)

Tappet adjustment :
The valve clearance should be checked and adjusted after every after 1 hours while the engine is cold.

We tested the ignition of this engine and concluded that it is best to use max 7.4 volts ! this will allow you to keep the ignition in working condition for many years .

FG-21 Manual