User Manual

6
TANK #5
1. Drive your vehicle on a large, flat, paved surface. Over
a 3-second time span gently pull the throttle trigger
tofullthrottleandbackagaintoidle.Accelerateand
decelerate as smoothly as you can.
2. Regularly check the fuel level while running. When
the fuel tank is nearly empty, shut off the engine by
touching the flywheel with a tool handle or small
block of wood. From the fifth tank on, you will not
need to let the engine cool between tanks. However
when shutting down the engine at any time, rotate
the flywheel so that the piston is at bottom dead
center (BDC).
TANK #6
1. Clean and reoil your air filter before you proceed.
During the sixth tank of fuel, you can run your vehicle
on smooth flat surfaces and off-road dirt as well.
The engine can now begin to be tuned for general
performance use.
COLD WEATHER BREAK-IN TIPS
During the break-in process, the piston and sleeve wear
into each other to form a precise fit. The engine needs to
heat up to a temperature of around 200 to 215 degrees to
relieve most of the mechanical stresses that the piston/
sleeve/rodmustendureduringinitialbreak-in.Aprecise
fit between these components is critical for proper
compression,andoptimumperformance.Iftheengine
runs too cold during break-in, the piston and sleeve will
not expand to their appropriate sizes for break-in, and this
can lead to premature wear of these components.
• Incoldweatherconditionsitisrecommendedtousea
heat gun to heat the engine to 160-180 degrees before
you start each tank of the break-in process.
• Oncetheengineisrunning,itisimportanttokeep
the temperature of the engine up around 200 to
215degreesduringbreak-in.Inweatherbelow45
degrees, the engine will tend to run at lower than
recommended temperatures of between 140 to 175
degrees (at proper break-in mixture settings). Do not
lean the fuel mixture to increase engine temperature
as this will decrease the available lubrication and
cause your piston/sleeve to wear prematurely.
• Ifneededwrapthecoolingheadwithaluminum
foil, paper towel, clean rag, or sock in order to
block some of the cooling airflow and help keep the
engine running around the recommended 200 to
215 break-in temp.
The engine can actually run too hot if too much of
the cooling airflow is blocked. Make sure that you
monitor the engine’s temp closely for the first couple
of tanks until you get the correct amount of cover for
the cooling head which will depend on your current
weather conditions.
Adjustthecoverupordowninordertoexposemore
or fewer cooling fins to regulate engine operating
temperature.
• Ifyoudonothaveatemperatureprobe,adropof
water on the cooling head (down around the glow
plug area) should slowly sizzle for about 5 to 10
secondsataround200to210degrees.Ifthewater
sizzles for only a couple of seconds, the engine is
likely over 220 degrees, and needs to be cooled down.
if water takes a long time or does not evaporate at all,
it means that the engine is running too cool.
• Itisnotrecommendedthatyouoperateyourengine
when ambient temperatures are below 35 degrees
Fahrenheit.Ifyouattempttorunyourvehiclebelow
35 degrees, your engine may become very difficult
tostartandtune.Attemperaturesbelowfreezing,
nitro fuel can begin to gel causing tuning and erratic
running issues along with being harmful to the engine.
TUNING YOUR DYNAMITE RACING ENGINE
Anitroengine’sperformancedependsonthefuelmixture.
Turning the mixture needles clockwise will lean the fuel
mixture and turning the mixture needles counterclockwise
will richen it. Leaning the fuel mixture will increase engine
power up to the point that the engine begins to starve for
fuelandbeginstooverheat.Anengineshouldneverbe
run too lean; doing so severely shortens the life of the
engine. When an engine is too lean, it will run very strong
immediately after being started but will soon begin to sag
and hesitate or stall when accelerating. The best way to
tune an engine is by using an infrared temperature gauge,
but you can use water to check the head temperature also.
TUNING THE HIGH-SPEED NEEDLE
To obtain the correct high-speed needle setting, start the
engine and drive your vehicle around for a minute or two.
Make several high-speed passes at full throttle in order to
clear out the engine. Place a drop of water on the cylinder
head.Ifthewatersizzlesaway(evaporatesimmediately),
theneedlesettingistoolean.Acorrectneedlesetting
willresultinthewaterevaporatingafter3-5seconds.If
the water does not evaporate, chances are good that the
needle setting is too rich. Lean the needle 1 hour (imagine
the slot in the needle is the hour hand on a clock and
adjust it as though you were moving the hour hand from
one hour to the next or previous one) and run the engine
again, adjusting the needle setting to get the desired
evaporation time.
Check the temperature each time you change
the needle mixture. Do not let the engine
overheat, as this will damage the engine.