8
The function of the various tubing connected to the engine
and tank (see sketch) are as follows:
To draw fuel from tank to pump (IN)
To deliver fuel from pump to carburetor (OUT)
To pressurize fuel tank.
Air intake pipe to take air into the crankcase, not a
breather. Be careful not to let the dirt and dust in.
Tube length should be less than 150mm.
Line A:
Line B:
Line C:
Line D:
Note: Since the FS-70 ULTIMATE has a positively
pumped fuel supply, it does NOT require muffler
pressurization.
Lines B is already installed when the engine is shipped
from the factory. If any of these lines should need to be
replaced, due to damage or installation problems, be sure
to use tubing of the same dimensions and quality as the
originals. The length of Line B is approx 65mm.
Important
A
D
C
B
A
B
D
C
Make connections using a commercially available thick-
walled silicone tubing of approximately 2.5mm bore and
5.0mm outside diameter. It is suggested that tube clips be
used at all connections.
Be sure to put the end of the pipe
outside the fuselage for air intake.
9
NEEDLE-VALVE EXTENSION
THROTTLE LINKAGE
Before connecting the throttle to its servo, make sure that the
throttle arm and linkage safely clear any adjacent part of the
airframe structure, etc., as the throttle is opened and closed.
Connect the linkage so that the throttle is fully closed when
the transmitter throttle stick and its trim lever are at their
lowest settings and fully open when the throttle stick is in its
fully-open position..
Carefully align the appropriate holes in the throttle arm and
servo horn so that they move symmetrically and smoothly
through their full travel.
Install these in the following sequence.
Screw the header pipe into the cylinder head until it " bottoms
", then unscrew sufficiently to achieve the desired exhaust
angle and tighten the locknut securely with a 14mm wrench.
Screw the silencer onto the outer end of the header pipe and
tighten the other locknut.
The application of a heatproof silicone sealant to the threads of
the exhaust system is recommended to reduce the risk of joints
loosening and the leakage of exhaust gases and oil residue.
EXHAUST HEADER PIPE & SILENCER
Reminder:
Model engines generate considerable heat and contact with
the header pipe or silencer may result in a serious burn.
If you need to tighten the silencer joints, which may loosen
when they are hot, use a thick folded cloth for protection.
The needle-valve supplied with this engine is designed to
incorporate an extension so that, when the engine is enclosed
within the fuselage, the needle-valve may be adjusted from
the outside.
Cut a commercially available rod to the required length, bend
one end to an L shape, insert it into needle's center hole and
secure it by tightening the set-screw in the needle-valve knob
with 1.5mm Allen key.
Needle Valve Extension Cable Set (Code No. 72200080) is
available from O.S. as an optional part.
Note:
The engine is equipped a slide valve carburetor
which has a narrower movement between fully
closed and fully open. Secure the throttle lever
linkage so that it may not move with vibration.
