1 • Turmoil ARR
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4. Fully insert the electric start shaft into the back of the engine.
Press the start button for ten seconds then stop. The engine
should turn over but likely won’t yet start. Continue these
ten-second starting attempts several times until the engine starts.
Note
: Should the engine not turnover when the starter is applied,
the engine maybe flooded (hydro-locked). Excess fuel in the
combustion chamber can prevent the piston from traveling through
its full range of compression, effectively “locking up” the engine.
Should this occur, remove the glow plug igniter from the plug and,
using a glow plug wrench (DYN2510), remove the glow plug and
turn the buggy upside down. Give the starter a few short blips to
clear the fuel from the combustion chamber then re-install the glow
plug and try again.
You may find it necessary to blip the throttle on the transmitter (applying the
throttle on/off) while trying to start the engine, as new engines are harder
to start due to the tight piston/cylinder fit. Never start an engine above 1/4
throttle or damage to your engine could occur.
Adjusting the Carburetor
Tuning Your Engine
When tuning the needle valves for maximum performance, adjust them in
small increments, 1/16 turn at a time. An engine should not be run too lean;
doing so will severely shorten the life of the engine. When an engine is set
too lean, it will run very strong at first but 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 also use water to check the head
temperature. (Refer to “Fine Tuning Your Engine”)
Fine Tuning Your Engine
As you gain experience, you will be able to tune your engine based on its
sound and feel during acceleration and at full throttle. Until you’ve developed
this skill, we recommend the following method of engine tuning. Start your
engine and drive your buggy aggressively for about two minutes. 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 slowly, in about 5–10 seconds. If the water
does not evaporate, the needle setting is too rich. Lean the high-speed
needle 1/8 of a turn and run the engine again, adjusting the needle setting to
the desired evaporation rate of 5–10 seconds. Check the temperature each
time you change the needle mixture. Do not let the engine overheat, this will
damage the engine.
Tuning the Low-Speed Needle
The low-speed needle (also referred to as the idle mixture or idle needle)
should be set after you’re satisfied with the high-speed needle setting. After
achieving the engine’s proper operating temperature, reduce the engine
throttle to idle for about 15 seconds. Now pinch the fuel line with your
fingers close to the carburetor fuel inlet nipple while carefully listening to
the engine rpm. If the engine dies immediately without an increase in rpm,
the low speed needle is set too lean. If the rpm’s increase dramatically and
then the engine dies, the setting is too rich. The ideal setting results in the
rpm’s increasing a slight amount (about 200rpm's after pinching the fuel line
before dying.