Losi LOSR2201 - Manual

Congratulations on the purchase your new Losi
product. Before installing your engine, please
read these instructions to ensure reliable and
trouble-free performance.
Using the Proper Fuel and Glow Plug
Using the proper fuel and glow plug is critical in order
to achieve maximum performance and reliability.
You must use fuel, glow plugs and air filters that
are specifically designed for model car/truck/buggy
applications. Never use any type of model airplane
glow fuel! Use of model airplane fuel can damage
your engine and immediately void any warranty.
We recommend using Losi Nitrotane
™ fuel, providing
the best combination of power and fuel economy. Losi
fuels are vigorously tested, researched and formulated
to deliver excellent power as well as engine protection.
A glow plug has been included and is ideal for
breaking in your new engine. In fact, during the
break-in procedure, it is not uncommon to go through
one or two glow plugs, as microscopic bits of metal
(from the cylinder/piston wearing in) bond themselves
to the plug element causing glow plug failure. We
recommend the Dynamite DYN2495 Glow Plug as this
is the best glow plug for this engine. The DYN2495
Plug has been designed to deliver an ideal balance of
performance and longevity.
All car engines must use a properly oiled air filter
to keep dirt out of the engine. Any dirt that enters
the carburetor can immediately destroy your engine.
We recommend LOSB5020 as an excellent choice
for a quality air cleaner. Service the air filter after
every hour of running, by washing out the foam filter
with warm water. Dry the filter then re-apply air filter
oil to the foam filter.
Carburetor Adjustments
Your Losi engine comes equipped with a precision
slide-valve carburetor. Take a moment to review the
pictures below to familiarize yourself with the various
functions of the carb. Loosening the nut located on the
side of the crankcase under the carburetor body will
allow you to rotate the carburetor to properly fit your
particular application. Make certain to mount the throttle
arm to the side required by your particular vehicle.
Although preset at the factory, some changes in the
needle setting can occur during shipping and handling.
We suggest the following settings for breaking in
your engine:
We recommend using an spin starter or starter box for
the initial starts, even with a pull-start equipped engine.
You may need to “blip” the throttle on the transmitter
(applying throttle on/off) while trying to start the engine,
as new engines are more difficult to start due to the
tight piston/cylinder fit.
Never start an engine above 1⁄4 throttle.
Immediate damage to your engine can
and will occur.
When the engine starts, the exhaust should emit lots
of blue/white smoke, indicating that the engine is
excessively rich (a good thing during break in). During
the first tank of fuel, you may wish to set a higher than
normal idle speed and/or leave the glow plug igniter
attached in order to keep the engine from stalling.
Drive your vehicle around while “blipping” the throttle
and avoid operating the engine at full throttle for
more than 2–3 seconds at a time. Consume the entire
first two tanks of fuel in this manner. After the first two
tanks of fuel, begin leaning out the high-speed needle
valve 1/8 turn at a time. It generally takes about 5
or 6 tanks of fuel before you’d want to start tuning
for “maximum” power.
454 Standard
Owner’s Manual
LOSR 2201
High-Speed Needle: 2 1 /
2
turns out (counterclockwise)
from closed.
Low-Speed Needle: 2 1 /
2
turns out (counterclockwise)
from closed.
When checking the adjustment of the low-
speed needle, it is crucial that the throttle
slide is closed completely when turning the
needle and that you do not over-tighten the
needle. Use an engine tuning screwdriver
(LOSA99176) to make this job easier. When
you feel resistance in the needle, immediately
stop turning and begin turning the needles
counterclockwise, counting the number of
turns from “closed.”
Starting Your Engine
for the First Time
The first start of your engine is the most critical time of
the engine’s life, dictating how well it will perform. After
installing the engine in your model and inserting the
glow plug, turn on your radio system and attach a glow
igniter to the glow plug. Place your finger over over the
exhaust and turn the engine over with the starter for
2–3 seconds to prime the fuel line.(This should only
be necessary when the engine is cold, do not touch
the exhaust pipe when the engine is warm. )
Should the engine become difficult for the spin start to
turn over, the engine may be flooded (hydro-locked).
Excess fuel between the cylinder head and piston will
not allow the piston to travel through its full range
of compression, effectively “locking up” the engine.
Should this occur, immediately remove the glow igniter
from the plug. Using a glow plug wrench (LOSB4603),
remove the glow plug and turn the model upside down
and rotate the flywheel to clear out the fuel, re-install the
glow plug and start again.
You may need to “blip” the throttle on the transmitter
(applying throttle on/off) while trying to start the engine,
as new engines are more difficult to start due to the
tight piston/cylinder fit.
High-Speed
Needle Valve
Fuel Inlet
(Adjustable)
Idle Stop
Adjustment
Leaner
Faster Idle
(clockwise)
Slower Idle
(counterclockwise)
Fuel Inlet
(Adjustable)
Low-Speed
Needle Valve
Low-Speed
Needle Valve
Leaner