Ofna Racing 1/8 SCALE OFF-ROAD BUGGY Instruction Manual

Strong Front and Rear chassis braces.
Tuned Polished Dual Chamber racing pipe.
Unique adjustable chassis width of 310mm or 330mm.
High performance .26 engine with Shaft Start Motor handle.
Full race Offset King Pin aluminum steering knuckle.
Three sealed differentials with 6 steel gears.
Racing X-Equal tires and V-spoke wheels.
Adjustable Front and Rear roll bars.
Multi disc brakes with adjustable bias.
Hard Coated Threaded body oil fill shocks.
5 Degree hard coated 3mm chassis.
Racing 3 shoe clutch with Aluminum CNC flywheel.
Steel main spur gear and center differential.
Adjustable servo saver.
Front CVA joint and 8mm axles.
140+cc fuel tank with inside stone filter.

INSTRUCTION MANUAL

RTR KITS - REQUIRED FOR OPERATION

THINGS NEEDED

Glow Fuel

20%

AA Batteries ( 12 pcs )

You will need to buy a few items to start the engine and run the car.

• Use 20% nitro CAR fuel. Do not use airplane or heli fuels, they will
over heat engine.

• Buy LONG glow plugs, like OFNA/PICCO Plug (#51007 or 51008).
Use plugs without idle bar. Do NOT use plugs, like the MC-59 or OS-8

In your box you will find..

• #10163 - Bottle, spout top

• #10219 - Red “D” size glow heater

You need to get batteries for the radio transmitter and the car receiver packs.

• Radio TX needs (8) eight AA batteries.

• Car needs (4) four AA Ni-cad batteries 2000Mah OFNA #10196 or (4) Alkaline.,
Alkaline type batteries will work, but braking will be reduced and 30 minute life. The
best for car, is to use a 5 cell hump receiver pack for increased voltage and longer
life..

Recommended Option:
You may want to upgrade the car battery pack to a Ni-Cad or NiHm 5 cell
type(600AE). This will give more run time. OFNA #10212 1200NiMh Hump Pack and

#10212 NiHm Hump Pack,
see charger 10214.

NiHm Battery Charger #10214

TOOLS NOT INCLUDED IN KIT,
BUT NEEDED TO MAINTAIN YOUR CAR.

Phillips Type Screw Drivers ( L )

Phillips Type Screw Drivers ( S )

10214
Over-nite
Charger

Instant Cement

Cutter

Curved Scissors
#91009 $5.95

Grease

Cross Wrench
#17109 $3.95

Needle Nose Pliers

Knife

Glow Plug & 17MM Cross Wrench
#10801 $6.95

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.
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 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! label for additional precautions.

• Do not leave in fuel bottle with lid off at any time.

• Do not use any fuel other than glow fuel in this engine. • Car Fuel tank - Never store fuel in car tank, it will ruin the

First Time Starting the Engine

Caution! When starting engine make sure the following is
observed.

• Set engine Master needle to 3 turns (rich setting) • DAMAGE DUE CAR RUN AWAY IS NOT A WARRANTY

• Do not do this alone, get an experienced friend to help at
first.

• 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.

The car is very fast

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 leave the glow fuel unattended with the lid
off. Fuel contains Methanol and Nitro Methane and is
flammable and poisonous.

Store fuel in cool ventilated location. Refer the glow fuel

engine if left in tank.

• Always turn off the car BEFORE turning off radio.

ISSUE.

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

FAILURE TO NOT READ AND

Engine Break-in

• See Engine Page.

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.

FOLLOW BREAK-IN ENGINE
INSTRUCTIONS WILL VOID
WARRANTY!

NON-RTR OR PRO KITS - REQUIRED FOR OPERATION

THINGS NEED BESIDES THE KIT

3.5 cc (21 Class) ENGINE
REAR EXHAUST

OFNA/Picco
O-1 bp
#51217

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 Heat with Battery & Charger

# 10227....$$19.95

(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

36mm-41mm

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)

1111

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 . . .

#10211 NiHm Battery Flat
Pack .. $29.95

# 10214 NiHm Battery Pack
Charger.. $7.95

# 51007 or 08 OFNA/Picoo
Glow Plug .. $4.95

TOOLS NOT INCLUDED IN KIT

Cutter

Phillips Type Screw Drivers ( L )

Curved Scissors

Brush

Phillips Type Screw Drivers ( S )

Needle Nose Pliers

Glow Plug & 17MM Cross Wrench

Knife

#10801 $6.95

Cross Wrench
#17109 $3.95

Instant Cement

Masking Tape

Paints

Grease

7mm and 5.5mm
Hex Wrench

INCLUDED WITH KIT

Shock Oil

Grease Box

5mm
Hex Wrench

3mm
Hex Wrench

2.5mm
Hex Wrench

1.5mm
Hex Wrench

40017
GEAR BOX PLASTIC PARTS

40015
ARM HOLDER PLASTIC PARTS

PLASTIC PARTS

40003
DIFF. CASE
PLASTIC PARTS

2

1

40027
WING SUPPORT PLASTIC PARTS

3

40013 & 40048
FRONT BUMPER & BATTERY HOLDER
PLASTIC PARTS

40031
SERVO SAVER PLASTIC PARTS

40040
CENTER DIFF. MOUNT PLASTIC PARTS

PLASTIC PARTS

40047
RECEIVER BOX PLASTIC PARTS

40018/40029
CHASSIS BRACE PLASTIC PARTS

40029

40065

40019

40018

40056
SHOCK ABSORBER PLASTIC PARTS

40046
STONE GUARD PLASTIC PARTS

40029

40065

ASSEMBLY OF THE THROTTLE LINKAGE SYSTEM

#30800
Plastic Throttle
kit

Throttle
Spring

Plastic Collar

* Take the plastic collar
from brake system plastic
parts.

3X3mm
Set Screw

#30530

2mm Rod

3X3mm
Set Screw

Plastic Throttle
Ball Joint

* Snap On.

#10300
Alum.Stopper

Note:

Battery life is short when using Alkaline batteries. For safety, we recommend using
Alkaline batteries for only 30 minutes before testing.. Battery strength affects braking
power and radio range. If voltage drops while running the car, you will loose control and
destroy your car! This is NOT covered under warranty.

To increase run time, upgrade receiver battery to a 5-cell hump pack. But, the most
important step you can make, “is to always use fully charged or fresh batteries when
running your car”. Another choice is to use OFNA #10196 2000 mAh NiMh AA batteries in
car and radio.

Brake

Idle Position

Full Throttle

3X3mm
Set Screw

#10300
Alum.Stopper

Fuel
Tube
( 6mm )

* Align throttle servo same
as shown.

CHECKING ENGINE THROTTLE

A

1. Insert AA batteries into
transmitter (8 Pcs).

2.Turn on transmitter.

3.Turn on receiver.

4.Center throttle trims as
shown .

IMPORTANT
CHECK RADIO THROTTLE
AND STEERING SWITCHES
BEFORE RUNNING CAR

* Insert into transmitter.

1. Pull Full Throttle.

B

C

1. Push trigger to full
brake position.

2. Adjust alum. Stopper to
increase or decrease
the brake.

B

A

* Align throttle servo same
as shown.

Brake (C)

A

Idle Position (A)

Full Throttle (B)

• Full throttle arm position.
Spring rod pulls throttle
barrel open and brake
rods release pressure on
brake cams.

C

C

B

• Full brake arm position.
Spring compresses
forward and brake rods
pull brake levers.

ASSEMBLY OF THE DIFFERENTIAL GEAR

4x4mm

40006
Cap Joint

Set Screw

40010

2.5x13.8mm
Pin

40003
Diff. Case

30779
4 x 10mm
washer

40004
Diff. Gear
(Small)

30773
4mm
Cross pin

40004
Diff. Gear
(Small)

30779
4 x 10mm
washer

36053
8x16mm
Ball bearing

(Builds one differential for Center)

40005
Break
Cap Joint

36053
8x16mm
Ball bearing

OPTION: #49001 HD STEEL GEAR SET,
INSIDE DIFF.

4x4mm
Set Screw

40003
Diff. Case

40010

2.5x13.8mm
Pin

ASSEMBLY OF THE DIFFERENTIAL CASE

40010

2.5x13.8mm
Pin

40004
Diff. Gear
(Large)

40012
6x15mm
Washer

*Use 6x15mm washer
to adjust the gear mesh.

( Builds two differentials for front and rear.)

40009
P6
O-Ring

40002
41T Large
Bevel Gear

40009
P6 O-Ring

40004
Diff. Gear
(Large)

40009
P6
O-Ring

49032
41T Large
HD Bevel Gear

36053
8x16mm
Ball bearing

40012
6x15mm
Washer

40012
6x15mm
Washer

40004
Diff. Gear
(Large)

40006
Cap Joint

30779
4 x 10mm
washer

40004
Diff. Gear
(Small)

40011
Diff. Gasket

30773
4mm
Cross pin

OPTION:
49032
43T Large
Bevel Gear
(must use 13t pinion)

40002
41T Large
Bevel Gear

40004
Diff. Gear
(Small)

30779
4 x 10mm
washer

Note: It is very important to add
or remove the #30779 washer if
the gear mesh is too tight or
too lose.

* Apply diff. gear grease to the
differential during assembly.
* Fill the diff. the case to
approx 70% with grease.

40010

2.5x13.8mm
Pin

(Builds one differential for Center)

40012
6x15mm
Washer

40004
Diff. Gear
(Large)

*Use 6x15mm washer
to adjust the gear mesh.

OPTION:
#49016 SPUR GEAR 50T
#49031 SPUR GEAR 50T, HD SPECIAL

40009
P6
O-Ring

40001
47T
Spur Gear

36053
8x16mm
Ball bearing

40005
Break
Cap Joint

40011
Diff. Gasket

40001
47T
Spur Gear

3x12mm
Flat Head
Tapping Screw

3x12mm
Flat Head
Tapping Screw

ASSEMBLY OF THE FRONT GEAR BOX

36053
8X16mm
Ball bearing

36053
8X16mm

Ball bearing....4

40024
13x16x0.2mm

Shim..............2

40024
13x16x0.2mm
Shim

40017
Gear Box

36053
8X16mm
Ball bearing

40021
14TSmall
Bevel Gear

OPTION: #49012 PINION GEAR
13TOOTH

40017
Gear Box

40021
14T Small

Bevel Gear..............1

ASSEMBLY OF THE FRONT ARMS HOLDER

94011
4x15mm
Tapping Screw
(Small Head)

MISC. SCREW BAG

40067

4x15mm

Tapping Screw........................2

90026
5x5mm

Set Screw......1

40022
Front Lower Arm
Holder (Front)

Use shims to adjust gear
mesh.

94014
4x45mm
Tapping Screw
(Small Head)

40015
Front Lower arm
Holder (Rear/Plastic)

ment

Screw

Ce

90026
5x5mm
Set Screw

36730
Cap Joint

4x16mm
Flat Head
Tapping Screw

36730

Cap Joint................................1

4 x 16mm
Flat Head

Tapping Screw.......................4

4x45mm

Tapping Screw........................2

40015
Front Upper arm
Holder (Rear/Plastic)

OPTION: #49002 CNC 7075
FRONT LOWER ARM HOLDER

94027
4x16mm
Flat Head
Tapping Screw

ASSEMBLY OF THE FRONT SHOCK TOWER

4mm
Nylon Nut

40014
Front
Shock Tower

M4x15
TP Screw

94004
M3x12
TP Screw

OPTION: 49003
CNC 7075 Alum. Shock Tower

ASSEMBLY OF THE FRONT KNUCKLE ARMS

40103
Front
Knuckle Arm

* "R" for right hand
side.

36055

2.5x17mm
Pin

Sc

Ce

rew

ment

36054
Alum.

90026
5mm
Set Screw

Wheel Hub 8mm

36053
8x16x5mm
Bal lbearing

ASSEMBLY OF THE FRONT LOWER ARMS

36870

*Notice the direction
of the steering ball.

4014
10mm
Steering Ball

4X10mm
Set Screw

40105
8mm CVA Joint
(Long/Front)

36053
8x16x5mm
Ball bearing

* A 4 x 10mm set screw is used
to adjust the ride height.

2mm

36870
4X10mm
Set Screw

40105
8mm CVA Joint
(Long/Front)

40104
10mm
Steering Ball

40103
Front
Knuckle Arm

LL

36053
8x16x5mm
Bal lbearing

Assembly of the left and gight hand side
are the same.

36055

2.5x17mm
Pin

36054
Alum.

36053
8x16x5mm
Bal lbearing

Assembly of the left and gight hand side
are the same.

40101
Upper Arm
Ball End

40104
10mm
Steering Ball

Wheel Hub 8mm

*Notice the direction
of the steering ball.

40101
Upper Arm
Ball End

ent

m

crew

e

S

C

90026
5mm
Set Screw

40102
Front
Lower Arm

40102
Front
Lower Arm

40104
10mm
Steering Ball

ASSEMBLY OF THE FRONT UPPER ARMS

40101
Front
Upper Arm

(Right)

40101
36860
5x40mm
Turnbuckle

Front

Upper Arm

Ball End

ASSEMBLY OF THE FRONT LOWER ARMS

90020

2.5mm
E-Ring

90021
3mm
E-Ring

36170
Arm Shalf
3mmt

(Left)

10mm

0 10 20 30 40 50

Assembly of the right and left hand side
are the same.

90020

2.5mm
E-Ring

mm

ASSEMBLY OF THE FRONT SUSPENSION ARMS

Caster

* Insert the caster adjuster

into upper arm.
40104
4x16mm
Cap Screw

Adjuster

rew

Sc

Cement

40023
Lower Arm Shaft (4mm)

90021
3mm
E-Ring

Assembly of the right and left hand side
are the same.

Sc

Ceme

nt

rew

* Insert the drive shaft
into cap joint before assembly.

40104
4x16mm
Cap Screw