Great Planes Yak-55M 50-55cc Sport / 3D ARF - GPMA1230 - Manual (Page 18)

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end of all three tubes. Insert the tubes into the stopper with the
metal plates, and then solder a barb onto the other end of the
two short tubes. Bend the vent tube and connect the pickup
and gas compatible fueling/defueling lines (not included) to
the short tubes. Connect the clunks to the Tygon Fuel lines
(not included) and secure the lines to the clunk and brass
tubing with the included small tie straps.
❏
2. Install the fuel tank stopper assembly in the fuel tank.
Check that the clunks move around freely in the fuel tank.
Tighten the fuel tank stopper screw.
❏
3. Install fuel lines onto the brass tubes from the fuel tank.
To route the fuel lines where shown, you will need to use a
12" [305mm] length of tubing on the fi ll and vent line and a 6"
[152mm] length on the carburetor line.
❏
4. Drill a 1/4" [25mm] hole through the fi rewall in line with
the carburetor inlet.
❏
5. Install the fuel tank onto the tray in the fuselage. Secure
the tank with two large plastic tie wraps. Feed the lines through
the fi rewall. Make sure when you insert the tank that the vent
line is at the top of the tank.
❏
6. Route the carburetor line through the fi rewall, trim it as
needed and attach it to the carburetor. Drill two 1/4" [25mm]
holes through the bottom of the fi rewall box as shown. Pass
the vent and fi ll lines through the holes. To secure the fi ll and
vent line we drilled additional holes in the fuselage. You may
wish to do this or secure the lines with a method of your choice.
Plug the fi ll line with the aluminum fuel plug.
❏
7. Install the ignition battery and module following the
instructions with the engine. We have provided four hooks for
securing the module and battery. Be sure to secure all of the
electrical connections between the ignition module, battery
and switch harness. Mount the ignition switch and charge jack
to the fuselage side. We used an Ernst Futaba charge jack
(ERNM3001) for our installation.
INSTALL THE MUFFLER
This airplane is designed to allow you the fl exibility of installing
your choice of a Pitts style muffl er, canister or a tuned pipe.
For purposes of this manual we will show the full installation
of the canister muffl er system and give an overview of the
requirements to install the tuned pipe and Pitts muffl er. You
need to decide which system you will use. You might wish to
review the installation instructions before determining which
option is best for you.