User Manual
2
ENGINE BREAK-IN
Dynamite racing engines are manufactured to exacting
tolerances and require a special break-in procedure in
order to accomplish the final precise fitting of the internal
enginecomponents.Itisveryimportantthatyoufollow
the break-in procedure as closely as possible in order to
achieve the best performance and longest life from your
Dynamite engine. Engine break-in will take between one
and two hours.
DynamiteenginesaremanufacturedwithanABCpiston/
sleeveconstruction.ABCstandsforaluminumpiston,and
a brass sleeve that is chrome plated. This type of engine
design relies on a very precise running fit between the
piston and sleeve for proper cylinder sealing and is vital to
achieving reliable long lasting engine performance.
People have differing opinions on what is the proper
procedure to break in a model engine. Old style break-in
procedures, such as idling the engine at low operating
temperatures on the bench for several tanks of fuel or
simply running the engine with a very rich fuel mixture for
the first 4 tanks of fuel, will not achieve the best results.
Only use the Dynamite break-in procedure. Other break-in
procedures could result in a weak, damaged, or otherwise
poorly performing engine.
The procedure outlined here was extensively tested and
proven to yield better performing engines than other
“common” break-in methods.
Allowyourselfplentyoftimeinordertoproperlybreak-
in your engine. The engine break-in period will take a
minimum of 5 tanks of fuel. Do not use the break-in time
to impress your friends with your new engine. Patiently
wait until the engine is fully broken in before attempting
continued high-speed running.
During break-in, your engine may appear to be
malfunctioning with symptoms like stalling, unpredictable
performance, and fouled glow plugs. These are simply the
normal “break-in pains” engines sometimes go through.
They will disappear once your engine is fully broken in.
BREAK-IN PROCEDURES AND TIPS
Break-in will be accomplished by accelerating, slowing,
and accelerating again at different rates for the first 5
tanks of fuel. Once the engine begins to break in, the
length and amount of the acceleration will progressively
increase. Continued high-speed running is not acceptable
during the first 5 tanks of fuel.
Perform the initial break-in on a large, flat, paved surface.
Smoothly apply all accelerating and decelerating action.
Avoidrapidaccelerationanddeceleratingasthiscould
cause the engine to stall.
• Specialbreak-infuelsarenotrecommended.Break-in
should be performed using the same fuel you plan to
use daily.
• Avoidbreakingintheengineinextremelyhotorcold
conditions.
• Avoidallowingthefueltanktoruncompletelyempty.
Low fuel levels cause the mixture to run too lean
possibly resulting in a burned glow plug or higher
than recommended engine temperature.
• Donotbreakintheenginebysimplyidlingitona
stand. This will not achieve the best results.
• Aglowplughasbeenincludedandisidealfor
breaking in your new engine. During the break-in
procedure it is not uncommon to go through one
or two plugs as microscopic bits of metal (from the
piston/sleeve wearing in) bond themselves to the plug
element causing glow plug failure. Keep extra glow
plugs handy.
• Changeorcleanyourairfilterafterthebreak-in
procedure is complete.
• Followtheinstructionsexactlyforeachofthefirst5
tanks of fuel.
• Neverrunyourengineindoors.Theexhaustfumesare
very harmful so always run your model outdoors, in a
well-ventilated area.
CARBURETOR ADJUSTMENTS
Your Dynamite engine comes equipped with one of a
number of available carburetors. Engines such as the .12,
.15, and .18 are equipped with either a 2-needle rotary
or 2-needle slide valve carburetor. Engines .21 and larger
are equipped with either a 2-needle or 3-needle slide
valve carburetor. Below are illustrations of each. Please
take a moment to review the pictures below in order to
familiarize yourself with the various functions that apply
to the particular carburetor that was supplied with your
engine.
Note: The carburetor’s initial startup fuel mixture
settings have been preset at the factory. Do not change
the settings.
High-Speed Needle
Fuel Inlet
Idle Adjustment
Rich
Lean
.21 and larger 2- and 3-needle slide valve carburetor