inlet. It controls the fuel to air mixture of the carb. The
needle is pre-set for break-in from the factory at 1-3/4 turns
out from the fully closed position of the carb. Once the
engine is broken-in, the high-speed needle would typically
run from 3/4 to 1-1/4 turns out from closed, depending on
the weather, humidity and altitude above sea level. To
richen turn the needle counterclockwise, to lean turn the
needle clockwise.
The Low-Speed Needle
The “low-speed” needle is the screw in the middle of the
throttle arm. It controls the fuel to air mixture at low throttle
settings. There is a simple way of adjusting the low-speed
needle correctly called the “pinch test.” With the engine at
idle, pinch the fuel line and listen to how the engine speeds
up or slows down. If the engine increases its speed for
about 2 or 3 seconds and then loses speed, the needle is
set correctly. If the engine loses RPM quickly, it is set too
lean and the low-speed needle needs to be opened
(counterclockwise) to richen the mixture and pinch again
to check the mixture. If the engine takes longer than 4
seconds
to slow down, lean (clockwise) the low-speed needle and
then pinch again to check the mixture.
The Throttle Stop Screw
On the front of the carburetor, there is a black screw. This is
called the idle stop screw. This increases or decreases the
idle RPM without changing the fuel to air mixture The barrel
should be approximately 1.5mm (between 1/32" and 1/16")
from fully closed.
To insure long life and good performance from your Torq .12
engine, you MUST break-in the engine. The break-in period is
critical for long life of the internal parts of the engine. This
should be done over the first 4 or 5 tanks of fuel.
Some Things To Remember During Break-In
1. Run with the body off. This will keep the engine cooler.
2. Keep the air cleaner on at ALL times
3. Run on a smooth hard surface. An empty parking lot is
perfect.
4. Use the same fuel that you will use for normal running.
5. Resist the urge to accelerate and decelerate the truck
quickly.
6. Break-in puts stress on the glow plug and you can burn it
out during break-in. Make sure you have an extra plug or
two on hand.
7. Do NOT overheat the engine. You can check the head
temperature by using one of the temperature gauges that
are available or by putting a drop of water on the top of the
cylinder head. If the water boils away immediately, shut off
the engine and allow it to cool. If it takes more than 5
seconds to boil away, the engine is at proper running
temperature for break-in.
Before running the engine, read the manual and watch the
engine video that came with this kit.
There are several simple steps to starting the engine:
1. Install a glow plug. This threads into the top of the cylinder
head.
2. Fill the tank - Fill the tank almost to the top. Leave a little air
at the top of the tank.
3. Prime the engine - Use the primer button on the fuel tank to
force the fuel through the fuel line. Watch the fuel go
through the line and when it gets to the carburetor, press the
primer button once more to get fuel into the engine.
4. Open the high speed needle valve exactly 1-3/4 turns out
(counterclockwise) from fully closed. The high-speed
needle is sticking up from the carburetor inside the
brass housing. All of the carburetor settings are adjusted
with a flat bladed screwdriver. If you have previously run the
truck, keep the same needle valve setting that you used on
your last run.
5. Start the engine by pulling the recoil - Use short, quick pulls.
DO NOT pull the recoil starter’s string to the end. You only
need 3 to 6 inches of pull to start the engine.
Sometimes it is helpful to start the engine at around half
throttle. Have a friend pull back on the throttle some while you
start the engine. This may be an indicator that the low speed
needle setting needs to be adjusted. When the engine starts,
immediately return the throttle to idle. If this is not done the
engine can over-rev and cause engine damage. If the engine
is difficult to turn over with the recoil starter, especially if
it is brand new, loosen the glow plug a half turn before
starting the engine. This allows some compression to
escape, but the engine will still start. Make sure you
tighten the glow plug after the engine starts. If the recoil
starter is still difficult to pull, the engine is flooded – there is too
much fuel inside the engine. Remove the glow plug and air
cleaner, then turn the engine upside down and pull the recoil 5
or 6 times. This will clear the engine of fuel, and you will notice
the recoil pulls easier. Replace the glow plug and repeat the
starting procedure.
Fuels
Use fuels that are specially formulated for car and truck
engines. DuraTrax Red Alert fuel is specially formulated for
buggy engines like the Torq .12.
How To Stop Your Engine
You may have been wondering how to stop the engine. All you
have to do is pinch the fuel line that runs to the carburetor and
from the bottom of the fuel tank. Pinching this will restrict the
fuel flow and the engine will quit within a second or two.
The First Tank
Your first tank of fuel should be running the truck at a very rich
high-speed needle valve setting. This allows the fuel to carry as
much oil as possible into the engine to lubricate the internal
parts during the break-in.
1. Open the needle valve 1-3/4 turns from fully closed
(counterclockwise). This is factory set already, but check it
to make sure. When closing the high-speed needle, close
the needle until you feel some resistance. DO NOT
overtighten or you will damage the engine.
2. Start the engine.
3. Once the engine is started, open the high-speed needle
valve around 1/8 turn at a time, finding the setting where
SECTION 11: RUNNING THE ENGINE
SECTION 10: BREAKING-IN THE ENGINE
12
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