ensure that the engine does not overheat during any run.
Looking at the smoke that comes out the exhaust is also an
indicator of how rich or lean the engine is running. If there is
a good amount of smoke coming out of the exhaust, then
chances are good that you are running rich.
❏
2. Run the touring car back and forth at a medium speed 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.
❏
3. Stop the engine and allow the engine to cool before the
second tank. This normally takes around 10 minutes.
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 line will restrict the fuel flow and the engine will quit
within a few seconds.
Tanks 3-5
Turn in the needle valve (clockwise) around 1/8 turn from
the previous setting for each additional tank. Run the car
back and forth. You should notice that the car will perform
better during each run. Stop the car periodically to check for
overheating. If it is too hot, stop the engine. Wait for it to cool,
and then turn the high speed needle valve counterclockwise
1/8 turn, and restart. After the 5th 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.
4. Do not overheat the engine. This goes along with
keeping it clean and not over-leaning the engine.
5. Do not use a fuel with a low oil content. Make sure you
use a fuel from a reputable manufacturer, such as
DuraTrax Red Alert.
6. Avoid using old fuels in the engine. Always run all of the
fuel out of the engine. After running for the day, use an
after-run oil and work it into the engine by turning the
flywheel or pulling the engine recoil slowly.
7. Do not use a fuel with a nitromethane (often called nitro)
content over 20%.
8. Do not scratch the piston or cylinder sleeve. Avoid
jamming something into the exhaust port when removing
or re-installing the clutch or flywheel. Use a special tool
called a crankshaft locking tool, which is installed in the
glow plug hole.
9. Do not use silicone sealer on the engine joints. Silicone
sealer contains acetic acid, which is corrosive if it gets
inside your engine.
10.Do not allow any water inside the engine. This sounds
easy, but temperature changes can cause condensation
inside the engine. This is a good reason to use an after-run
oil. Store your engine inside the house, not in a garage or
shed where there will be temperature extremes.
If you are having problems with your engine consult
the engine troubleshooting flow chart on page 19. The
following are some potential problems.
Glow Plug
The glow plug is an item that will wear out and need
replacement from time to time. It is a good idea to remove the
glow plug before your first run, heat it and see how well it
glows.You should see a bright orange glow from the filament.
If a coil or two will not glow or the plug will not glow at all,
replace the plug. If the engine quits when you remove the
glow starter, the plug might need to be changed, although
this may be because you are running too rich and need to
screw in your high-speed needle some. Look at the glow plug
when you are running the engine. If you see some bubbles
coming from around the plug, replace the glow plug (copper)
gasket, or both the plug and gasket. The only real way to test
a glow plug is to replace it. Make sure you have a spare plug
or two on hand every time that you run the Street Force GP2.
Fuel
Fuel can go bad. The main ingredient in model fuel is
methanol, which is basically an alcohol. Alcohols can
absorb water out of the air, so keep your fuel jug capped at
all times. Store your fuel out of the sunlight and in a cool
place. Bad fuel is one of the most difficult problems to
diagnose in engines. If you have tried everything you can
think of to remedy an engine that is not running correctly, try
using some fresh fuel.
Fuel line is susceptible to pinhole leaks. You cannot see the
hole in the fuel line, but if you see air bubbles in the line
going to the carburetor, replace the fuel line. Another
symptom of a leak in the fuel line is a surging engine. The
properly tuned engine will surge when the air bubbles hit the
carb. It is basically leaning out the mixture.
ENGINE MAINTENANCE
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