User Manual

ManualsBrandsDynamite ManualsCars & Trucks21 Mach 2 Buggy Engine with Pull/Spin Start

Congratulations on your purchase of a Dynamite

.21

racing engine. Precision manufactured and assembled,

your Dynamite .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 Platinum

#3 glow plug (DYNP5603) as the absolute best glow plug

for this engine. The Dynamite Platinum #3 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 Dynamite .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.

Pull-start/Spin-start engines:

When using a recoil starter, never pull the rope out it’s full

length. 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. Use a glow plug wrench

(DYN2510) to 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 a 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.

.21 SG

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

Non-pull-start engines:

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

and 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 (DYNP5300) Quickfire Starter

Box to handle the high compression of the Dynamite

.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.

High-Speed

Needle Valve

Fuel Inlet

(Adjustable)

Idle Stop

Adjustment

Leaner

Faster Idle

(clockwise)

Slower Idle

(counterclockwise)

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. 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.
PAGE 2
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.
PAGE 3
Warranty Period: Exclusive Warranty- Horizon Hobby, Inc., (Horizon) warranties that the Products purchased (the “Product”) will be free from defects in materials and workmanship at the date of purchase by the Purchaser. Limited Warranty (a) This warranty is limited to the original Purchaser (“Purchaser”) and is not transferable. REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS WARRANTY IS THE EXCLUSIVE REMEDY OF THE PURCHASER.
PAGE 4
DYN6000 DYN6001 .