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 R/C car engines like the Velocity .15.
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 few seconds. You can also
touch the flywheel with the tip of your shoe through the
hole in the bottom of the chassis.
To insure long life and good performance from your
Velocity .15 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
5 or 6 tanks of fuel. Be sure to watch the engine tuning
video that came with this kit.
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
touring car 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.
The First Tank
Your first tank of fuel should be running the touring car
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 2-1/2 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 the engine just barely runs. This may
take a few times adjusting the needle, running the
touring car away from you and back, then adjusting
the needle. The touring car will perform sluggishly
and stall from time to time - that is normal.
4. Run the touring car back and forth at medium speeds,
slowly accelerating and decelerating the touring car,
until the tank is almost out of fuel. Do not allow the
tank to run out of fuel. This leans out the engine
and can cause overheating.
5. Stop the engine and allow the engine to cool before
the second tank. This normally takes around 10
minutes (See
How To Stop Your Engine
).
Tanks 2-6
Turn in the needle valve (clockwise) around 1/12 turn
from the previous setting. Run the touring car back
and forth. You should notice that the touring car will
perform better during each run. Stop the touring car
periodically to check for overheating. If it is too hot,
stop the engine. Wait for it to cool, then open up the
needle valve and restart. After the 6th tank, you should
be near to the peak performance of the engine.
Ten Ways To Ensure A Long Life From Your Engine:
1. Keep your engine clean. Dirt will act as insulation
on an engine. It will not be able to shed heat as
easily. Use a good air filter to keep dirt out of your
engine and clean it often.
2. Do not over-lean your engine.
3. Do not run your engine with little or no load. Don’t
throttle up the engine to full throttle when the
wheels are not in contact with the ground.
ENGINE MAINTENANCE
BREAKING-IN THE ENGINE
12
