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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,
connect the plug to the glow starter 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 lean your high-
speed needle. 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. 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 Raze. We recommend
the DuraTrax Gold Plug (DTXG3005).

AIR FILTER
Dirt can get into your carburetor and engine through the air
filter. Ensure that your air filter has a good seal to the top
of the carburetor. Periodically wash the air filter foam
element (using dish soap and water) and re-oil the filter with
filter oil (DTXC2465). Any air filter that has a torn element or
a bad seal should be replaced immediately.

FUEL
Use fuels that are specially formulated for car and buggy
engines like O’Donnell 20% RTR Fuel (ODOP3520).

Fuel can go bad. The main ingredient in
model fuel is methanol, which is basically
alcohol. Alcohol will 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, off the ground away from
temperature extremes. 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 SYSTEM
The fuel line is susceptible to pinhole leaks. You usually
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.
A properly tuned engine will surge when the air bubbles hit
the carburetor. It is basically leaning out the mixture.

Dirt can get caught in the needle seat and cause an
inconsistent running engine. If you suspect that some dirt has
lodged itself in the carburetor, remove the needles and clean
the carburetor with denatured alcohol or fuel. It can help to
use compressed air to blow out the fuel passages as well.

OVERHEATING
One of the worst things you can do to your engine is
overheat it. The oils that lubricate the engine are carried in
the fuel. If your engine is set too lean, there will not be
enough oil in the engine to lubricate the internal parts. This
will cause premature wear in the engine and cause damage.
The easiest way of checking the temperature of the cylinder
head is by using one of the available temperature gauges
(we recommend the DuraTrax Flashpoint Temperature
Gauge, DTXP3100). This will give you a direct reading of the
cylinder head temperature. Hold the temperature gauge
directly on the cylinder head so the gauge is pointed directly
at the glow plug. Do not let the head temperature exceed
270° Fahrenheit (132° Celsius).

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