User Manual

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Congratulations on your purchase of a Dynamite

Platinum Series (DPS

™

) .21 racing engine! Precision

manufactured and assembled, your DPS 21 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 Dynamite Blue Thunder

™

Race Formula fuel 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 McCoy MC59 Glow Plug

(DYN2508) as the absolute best glow plug for this

engine. The MC59 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 DYN2614 as an excellent choice for a

quality air cleaner.

Carburetor Adjustments

Your DPS 21 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 turns out (counterclockwise) from

closed.

Mid-Range Needle: Screw should be flush with the face

of the carburetor.

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”).

Platinum .21XP

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 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 vehicle on

top of your starter box and engage the flywheel to your

starter wheel. Should the engine become difficult for

your starter box 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

(DYN2510), remove the glow plug, turn the model

upside down and rotate the flywheel to clear out the

fuel, re-install the glow plug and start again.

We recommend using the (DYN5625) Torque Start

HD Starter Box to handle the high compression of the

DPS 21. 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.

High-Speed

Needle Valve

Mid-Range

Needle Valve

Fuel Inlet

(Adjustable)

Idle Stop

Adjustment

Leaner

Faster Idle

(clockwise)

Slower Idle

(counterclockwise)

Idle Stop

Adjustment

Low-Speed

Needle Valve

Low-Speed

Needle Valve

Summary of content (4 pages)

PAGE 1
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 DYN2614 as an excellent choice for a quality air cleaner. Carburetor Adjustments Platinum .21XP Owner’s Manual Congratulations on your purchase of a Dynamite® Platinum Series (DPS™) .
PAGE 2
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 frequently. 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.
PAGE 3
Warranty Limited Warranty Period Horizon Hobby, Inc. guarantees this product to be free from defects in both material and workmanship at the date of purchase. Limited Warranty & Limits of Liability Pursuant to this Limited Warranty, Horizon Hobby, Inc. will, at its option, (i) repair or (ii) replace, any product determined by Horizon Hobby, Inc. to be defective. In the event of a defect, these are your exclusive remedies.
PAGE 4
Spare Parts Listing DYNP5332 DPS .21XP REAR EXHAUST DYNP5321 DYNP5379 DYNP5322 DYNP5379 DYNP5325 DYNP5387 DYNP5379 DYNP5386 DYNP5379 DYNP5379 DYNP5377 DYNP5379 DYNP5371 DYNP5302 DYNP5303 DYNP5304 DYNP5388 DYNP5389 DYNP5375 DYNP5378 DYNP5390 DYNP5379 DYNP5324 DYNP5331 DYNP5306 DYNP5307 DYNP5308 DYNP5331 DYNP5331 DYNP5376 DYNP5379 DYNP5313 DYNP5334 DYNP5380 DYNP5381 DYNP5383 DYNP5385 DYNP5384 DYNP5333 DYNP5315 DYNP5382 Stock # Description DYNP5302 HEAD BUTTON: DPS 21XP/21 DYNP5303 HEAD SHIM .