Losi LOSR1001 - Manual

Congratulations on your purchase of a Losi Sport Mach
26SS engine. Precision manufactured and assembled,
your engine will provide you with trouble-free
performance if you read and follow these instructions.
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 Team Losi
® Nitrotane ™ fuel with
20% nitro, providing the best combination of power
and fuel economy. Team 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 MC-59 glow
plug (DYN2508) as the absolute best glow plug for this
engine. This glow 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.
Carburetor Adjustments
Your 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. 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:
High-Speed Needle: 3 turns out (counterclockwise)
from closed.
Low-Speed Needle: 2 1 /
4
turns out (counterclockwise)
from closed.
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.
Do not skip this process of breaking in a new
engine! Should you choose not to follow these
procedures, you risk damaging your engine
during the first tank of fuel.
Your patience during these procedures will be rewarded
by an engine that performs reliably and to its maximum
power potential. First run attempts can be more
frustrating than with other (less powerful) sport engines,
so take your time—it will be worth the wait. Glow
plug failure is a common occurrence when breaking
in a new engine. To test your plug, let the engine idle
at a properly adjusted low-speed needle setting with
the glow igniter attached. Then, remove the igniter. If
you hear no appreciable change in engine rpm, the
plug is still good. If the engine loads up and the rpm’s
decrease, it’s time to replace the glow plug.
Setting the Needle Valves
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
severely shortens the life of the engine. When an
engine is set too lean, it will run very strong at
first 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 also use water to check
the head temperature (Refer to “Tuning the High-Speed
Needle”).
Owner’s Manual
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 such
as SWK9912 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.
When using a recoil starter, never pull the rope out to its
full length, as doing so may cause damage and recoil
starter failure. Quick, short pulls of the recoil starter
are the best technique to use. Never extend the starter
rope more than 12 inches. Should the pull-starter be
extremely difficult to pull (will not extend out of the
assembly), 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 good quality glow plug wrench,
remove the glow plug and turn the model upside down.
Give the recoil starter a few short pulls to clear out
the fuel, re-install the glow plug and start again. We
recommend using an electric starter or starter box for
the initial starts, even with a pull-start equipped engine.
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
High-Speed
Needle Valve
Leaner
Low-Speed
Needle Valve
Fuel Inlet
(Adjustable)
Idle Stop
Adjustment
Leaner
Faster Idle
(clockwise)
Slower Idle
(counterclockwise)