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Mach .28

Owner's Manual

Congratulations on your purchase of a Mach .28 engine!

Precision manufactured and assembled, your Mach .28

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 will damage your engine and

immediately void any warranty.

We recommend using Blue Thunder

or Blue Thunder

™

Race Formula blend fuels with 20% nitro, providing the

best combination of power and fuel economy. Dynamite

Blue Thunder 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 McCoy

Power Plug (DYN2508) as the absolute best glow plug for

this engine. Delivering an ideal balance of performance

and longevity, this is the same glow plug that continues to

win races at every level of competition, from local events to

World Championships.

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

DYN2814 as an excellent choice for a quality air cleaner.

8002_DYN_mach28_manual.indd 1

Carburetor Adjustments

Your Mach .28 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.

High-Speed Needle Valve

Low-Speed

Needle Valve

Leaner

Slower Idle

Faster Idle

(counterclockwise)

(clockwise)

Idle Stop Adjustment

Leaner

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 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 a Dynamite

engine-tuning screwdriver (DYN2775) 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 quality glow plug wrench

(DYN2510), 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.

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

⁄

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. Do not skip this

process of breaking in a new or rebuilt 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 frustrat-

ing 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 break-

ing 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, then 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 is small increments,

⁄

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" below.)

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, applying full throttle for periods of 5 seconds or

more. 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 1/8 of a turn 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!

Tuning the Low-Speed Needle

The low-speed needle (also referred to as the idle mix-

ture or idle needle) should be set after you're satisfied

with the high-speed needle setting. After achieving the

proper operating temperature, reduce the engine throttle

to idle and pinch the fuel line for 3–5 seconds with your

fingers close to the carb fuel inlet nipple. If the engine

dies immediately, the low-speed needle is set too lean.

If the rpm's increase dramatically, the setting is too rich.

The ideal setting results in the rpm's increasing just

a slight amount after pinching the fuel line.

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