OFNA Racing Dirt Oval User Manual

MODEL SHOWN MAY BE PROTOTYPE AND MAY VERY SLIGHTLY FROM KIT. SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE.

OFNA RACING
7 VANDERBILT
IRVINE, CA 92618
PHONE: [phone]
FAX: [phone]

MUST READ THIS BEFORE RUNNING

Running a nitro kit is fun and easy, but to make this a safe • Clean oil and dirt from chassis with a degreaser like
and good experience you must observe a few rules. This
kit is extremely fast, easily over 40MPH, and can seriously
injure someone if you are not careful.

Where to run car?

• Any running area you choose must be dry. Do not run
car near any water or wet dirt.

• Do not run on public streets. It is very easy to have the
car run over or damaged by hitting the curb.

• Do not operate car in tight confined places. The car is
very fast and will easily hit something.

• Do not run near people or animals.
and will too easily hit someone.

• Due to noise, you will want to consider the surrounding
area when operating the car.

• Do not operate the car at night. You will not be able to
drive it without hitting something.

• Do not operate the car indoors. Engine exhaust is not
healthy.

Glow Fuel

• Glow fuel is poisonous!

• Glow fuel is flammable!

• Do not leave in fuel bottle with lid off at any time. label for additional precautions.

• Do not use any fuel other than glow fuel in this engine.

First Time Starting the Engine

Caution! When starting engine make sure the following is
observed. • Always turn off the car BEFORE turning off radio.

• Set engine Master needle to 3 turns (rich setting)

• Do not do this alone, get an experienced friend to help at • DAMAGE DUE CAR RUN AWAY IS NOT A WARRANTY
first. ISSUE.

• Fill fuel tank, try not to spill fuel. Do not spill fuel on
receiver

• Hold car off the ground, so it will not runaway when first
starts

• Turn on Radio and check the linkage before starting
engine.

• Turn on car receiver battery switch.

• Always have an air filter on the carburetor to keep dirt
out of engine.

Engine Break-in

• See Engine Page.

The car is very fast

Simple Green.

Precautions

• This kit is not a toy. Always run car with a second
person as a spotter and pitman.

• Hot Parts - The pipe, manifold, engine and head are very
hot and will cause burns.

• Rotating Parts - Keep hands away from the drive train,
wheels, and engine when engine is running.

• Radio - Check batteries life before running the car. If
radio does not have full control of the car with steering
and/or throttle/brake do not run until corrected. Failure to
correct this will result in possible injury and damage to the
car or property.

• Glow fuel - Do not leave the glow fuel unattended with
the lid off. Fuel contains Methanol and Nitro Methane
both are flammable and poisonous.

•Store fuel in cool ventilated location. Refer the glow fuel

• Car Fuel tank - Never store fuel in car tank, it will ruin the
engine if left in tank.

IF YOU DO NOT BREAK-IN ENGINE
CORRECTLY, MAINLY AT LOW RPM,
YOU WILL BREAK THE CONNECTING
ROD!

FAILURE TO NOT READ AND
FOLLOW BREAK-IN ENGINE

Emergency Stopping Engine When Running

• Remove air filter and cover carb. intake.

• Squeeze fuel line and hold until engine stops.

• With a rag, cover exhaust outlet.

Storing Car After Running

• Remove fuel from tank and fuel lines

• Turn off radio in car

• Put a few drops of after run in engine to keep it from
rusting.

INSTRUCTIONS WILL VOID
WARRANTY!

CHECK RADIO SETTING,
LINKAGE BEFORE STARTING.

THINGS NEED BESIDES THE KIT

3.5 cc (21 Class) ENGINE
REAR EXHAUST

OFNA/Picco
P-9R EVO

#51219

REQUIRED FOR OPERATION

Glow Fuel

20%

Bottle’s with spout
# 10160 - large 500cc
# 10161 - large 500 ccAuto Stop
# 10162 - small 250cc
# 10164 - CNC spout 500CC
# 10167 - CNC spout 800CC

Glow Plug Long Heat with Battery & Charger

# 10215....$27.95

(please note OFNA Glow Heats available)

Note: Pro kit does not include engine!

RADIO CONTROL UNIT

Note: Carefully read the instruction manual of your
2 channel radio controller before using.

SUITABLE SERVO SIZE

m

m

1

mm-4

36

15mm - 21mm

29mm - 42mm

Off-Road Starter Box, 12V motor
# 10250 - 1/8 scale Starter Box
# 10253 - 1/8 scale Starter Box w/ Panel
Off-Road Starter Box, two 550 motors
# 10248 - 1/8 scale Starter Box
# 10249 - 1/8 scale Starter Box,RTR
Optional Parts
# 92571 - Power Panel Glow Heater
# 92572 - Cable for Glow Plug

Radio must be set at neutral position
before installing in the kit.

SEQUENCE TO SET NEUTRAL

Install AA batteries in Radio.

Extend the antenna.(Transmitter)

Install batteries into Car receiver .

After installing the battery, connect the
battery box.

Extend the antenna. (Receiver)

Set the trim-lever at center.

Turn on the switch. (Transmitter)

Turn on the switch. (Receiver)

Make sure the servos are in command.

When the operation stick is in neutral,
servo horns must be in neutral as will.
*Adjustment can be made by re­ installing the servo horn.

Turn off the switch. (Receiver)

111111

Turn off the switch. (Transmitter)

12

Retract the antenna. (Transmitter)

13

12V Battery for Starter Box
(must have)

AA Batteries ( 12 pcs ) for radio

More Optional Parts . . .

#10202 NiHm Battery Hump

Pack .. $34.95

# 10214 NiHm Battery Pack
Charger.. $7.95

# 51007 OFNA/Picoo Glow
Plug .. $13.95

TOOLS NOT INCLUDED IN KIT

Phillips Type Screw Drivers ( L )

Phillips Type Screw Drivers ( S )

Needle Nose Pliers

Knife

Cutter

Curved Scissors

Precision Caliper

Brush

Cross Wrench

Instant Cemment

Masking Tape

Paints

INCLUDED WITH KIT

1.5mm Allen Wrench

2mm Allen Wrench

2.5mm Allen Wrench

4mm'5mm Allen Wrench

1

ASSEMBLY OF THE FRONT AND REAR DIFF.

Builds two differentials for front and rear.

Step 1

94034
4x4mm
Set Screw

30777
P5 O-Ring

30780
2x12.8mm Pin

30620
7x19x6mm Ball Bearing

2

ASSEMBLY OF THE FRONT AND REAR DIFF.

.....x2

.....x4

Oil

.....x4

30901

.....x4

Step 1 Step 2

30620

30773

30769

30751

30776

30777

30780

30769

30779

Step 2

30769

30777

Tighten

3x12mm

30751

30901

Oil

30620

30780

4X4mm

*Fill the diff oil just level with the
top of the satellite gears.

80%

30776
4x10mm Washer

94004
3x12mm
Hex Screw

30773
4mm
Cross Pin

3

ASSEMBLY OF THE FRONT AND REAR BEVEL GEARS

30121
4x3x3mm
Chromed Tube

30121
3x5mm Screw

.....x8

.....x8

.....x4

.....x8

.....x8

Step 1 Step 2

*Push 3mm tubes into the
holes of the diff. Case.

i

fD

f

.

Oil

* Use #100000 diff. oil for front
and grease for the rear.

*Tight the diff screws in this order.

1

4

31010

3

2

30121

30121
3x5mm

1

4

ASSEMBLY OF THE GEAR BOX AND FRONT SHOCK STAY

Step 1 Step 2

94036
5x4mm
Set Screw

30631
6x13x5mm
Ball Bearing

94009
4x10mm
Hex Screw

94023
3x25mm
Flat Head Screw

94029
4x25mm
Flat Head Screw

5

ASSEMBLY OF THE FRONT LOWER ARMS

90021
3mm
E-Ring

36870
4x10mm
Set Screw

.....x4

.....x2

.....x1

.....x2

.....x2

.....x2

.....x2

Apply
Grease

36890

Ensure
Free
Movement

30130

30010

30631

*A 4x10mm set screw is
used to adjust ride-height.

4x10mm

3x25mm

2.0mm Tool

30631

Approx. 3mm

36171

5x4mm

Screw

C

30082

30010

4x25mm

t

men

e

4x10mm

34043

3mm

94011
4x16mm
Hex Screw

6

ASSEMBLY OF THE FRONT UPPER ARMS

90021
3mm
E-Ring

94010
4x12mm
Hex Screw

.....x2

3mm

4x16mm

.....x2

36900

.....x2

36905

3mm

30160

Ensure
Free
Movement

36640

36905

36890

Ensure
Free
Movement

Caster Adjuster

3mm

4x12mm

30654

Ensure
Free
Movement

2

*Caster angle will
become bigger.

*Caster angle will
become less.

7

ASSEMBLY OF THE FRONT KNUCKLE ARMS

Assembly for both right and left side.

*Notice the direction of the
plastic washer.

94036
5x5mm
Set Screw

36055

2.5x16.8mm Pin

36053
8x16x5mm
Ball Bearing

8

ASSEMBLY OF THE FRONT KNUCKLE AND FRONT SUSPENSION ARMS

.....x2

.....x2

.....x4

5mm Tool

Do Not
Over Tighten

36904

36905

36905

Do Not
Over Tighten

36903

36903

36901

Cement

36053

30656

c e

r

w S

5x5mm

Step 2Step 1

* "L" for left side.

L

36055

36053

36052

Make steering
ball move
smooth.

Assembly for both right and left side.

Approx. 4mm

9

ASSEMBLY OF THE FRONT STABILIZER

94035
3x8mm
Set Screw

30403
6mm Ball

94005
3x16mm
Hex Screw

.....x2

.....x2

.....x2

*Insert the drive shaft
before assembly.

3x16mm

Approx. 3mm

Assembly for both right and left side.

Makes two rods for left and right
hand-side.

30341

30403

2.5mm
Hex Wrench

40029

3x8mm

40199

3

10

ASSEMBLY OF THE FRONT STABILIZER

3x3mm

Screw
Cement

94040
3x8x0.8mm
Washer

3x3mm
Set Screw

94002
3x8mm
Hex Screw

11

ASSEMBLY OF THE SERVO SAVER

94041
M3
Nylon Nut

.....x2

.....x2

.....x2

.....x2

Step 1 Step 2 Step 3

6mm

3x8x0.8mm

3x8mm

Ensure
Free
Movement

30273

36740

36740

6mm

36740

36740

S

C me

e

cr

ew

3x3mm

nt

3x16mm

36742

6mm
E-Ring

94005
3x16mm
Hex Screw

12

ASSEMBLY OF THE SERVO SAVER AND THE STEERING TIE-ROD

94003
3x10mm
Hex Screw

94021
3x16mm
Flat Head Screw

.....x4

.....x2

Step 1

30272

.....x3

.....x2

36741

8x12x1mm

30361

6mm

6mm

3x10mm

3x10mm

34014

Step 2

40038

36700

36740

30361

36790

3x16mm

36850

Ensure
Free
Movement

30658

3mm

3x16mm

30380

1:1

*Approx. 33.5mm

4

13

ASSEMBLY OF THE SERVO SAVER ONTO THE FRONT GEAR BOX

94041
M3
Nylon Nut

.....x2

3x18mm

94003
3x10mm
Hex Screw

94022
3x18mm
Flat Head Screw

14

ASSEMBLY OF THE GEAR BOX AND REAR SHOCK STAY

94036
5x5mm
Set Screw

30631
6x13x5mm
Ball Bearing

.....x2

.....x2

.....x1

.....x2

3mm

Step 1 Step 2

30010

Apply
Grease

3X18mm

40039

S

Cemen

30631

cr

ew

t

30082

5x4mm

3x16mm

3mm

3x10mm

34044

40039

3mm

94005
3x16mm
Hex Screw

94022
3x18mm
Flat Head Screw

94029
4x25mm
Flat Head Screw

15

ASSEMBLY OF THE REAR LOWER ARMS

90021
3mm
E-Ring

36870
4x10mm
Set Screw

94027
4x16mm
Flat Head Screw

.....x2

.....x2

.....x2

.....x4

.....x2

.....x2

3mm

Ensure
Free
Movement

30351

30130

30631

3x18mm

*A 4x10mm set screw is
used to adjust ride-height.

2.0mm
Hex Wrench

4x10mm

30010

4x25mm

Approx. 3mm

36171

Ensure
Free
Movement

3mm

Set triangle marks in
the direction shown
in Fig.(1)

4x16mm

30351

31303

31303

5