Saito FA-30S (H), Instruction Manual

• Connect the heating source to the

glow plug.

• Using either the “chicken stick” or

electric starter, spin the propeller until
the engine is running.

Note:  A very common error is to
remove the glow plug igniter too early.
It is suggested that the igniter be left
attached until after the engine has been

run up and the high-speed needle valve

has been properly adjusted.

8.  Initial break-in:  

Do not exceed 4,000 rpm for the first
10 minutes of operation. This allows
all parts to mate properly with good
lubrication. 

Note:  Due to the excessively “rich”
mixture setting, it may be necessary to
leave the heat source attached to the

glow plug.

Subsequent runs may be made while
slightly leaning out the mixture with

each tank full of fuel. Forty minutes is
considered sufficient time for normal
break-in prior to the first flight.

9.  After break-in:

If a test stand was used for the break-in

procedure, the engine may now be
mounted in the aircraft using a high-
quality motor mount such as those
available from Saito specifically or for

Saito engines.

The idle needle valve (89) (or air bleed

needle valve) for the Saito .30S(H)/
GK engines) may now be refined.
Please refer to the "Carburetor
Adjustments" section on page 6 for
information on how to do so.

The valves may also be checked at this
time. Refer to the "Engine
Maintenance" section on page 8 for
information on the valve/tappet
adjustments.

The use of a tachometer is encouraged
for setting the high-speed needle valve
(85) prior to flight. The peak rpm

should be obtained and then reduced

by approximately 200 – 300 rpm by
turning the high-speed needle valve
counter-clockwise (richen). Each
engine’s peak rpm can be found on the

"Propeller Chart" on page 16. Over-
revving of a 4-stroke engine can cause

internal damage to the engine.

Carburetor
Adjustments for Two
Needle Carburetors

The low-speed, or idle needle valve
(89), is preadjusted at the factory for
best performance during break-in.

After break-in it may be necessary to

“fine tune” the low speed adjustment
using the following procedure:

1.  Start the engine and let it warm up
prior to attempting any adjustments.

6  

S  T   A  R  T   I  N  G    T  H  E    E  N  G   I  N  E

 Saito Single Cyl Manual 9-00  9/11/00  10:06 AM  Page 8