OFNA Racing Worlds II User Manual

1/8 Scale
Gas Powered Off-Road Buggy

The body shown is slightly different in the U.S. kits

PURE COMPETITION...........

INSTRUCTION MANUAL

OFNA Racing
22692 Granite Way, Ste. B
Laguna Hills, Ca. 92653
[phone]
Www.ofna.com

THINGS NEED BESIDES THE KIT

3.5 cc (21 Class) ENGINE
REAR EXHAUST

Note: The engine may not include in kit.

REQUIRED FOR OPERATION

Glow Fuel

20%

Fuel Bottle
# 10160 - large 16oz
# 10161 - large AutoStop
# 10162 - small 8oz

Off-Road Starter Box
# 10250 - 1/8 scale Starter Box
# 10253 - 1/8 scale Starter Box w/ Panel
Add-on
# 92571 - Power Panel Glow Heater
# 92572 - Cable for Glow Plug

Glow Plug Heat with Battery & Charger

# 10227....$$19.95

(please note OFNA Glow Heats available)

12V Battery for Starter Box
(must have)

AA Batteries ( 12 pcs ) for radio

RADIO CONTROL UNIT

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

SUITABLE SERVO SIZE

36mm-41mm

TOOLS NOT INCLUDED IN KIT

Phillips Type Screw Drivers ( L )

15mm - 21mm

29mm - 42mm

Cutter

Curved Scissors

Super Glue

Masking Tape

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-leved 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.

1111

Turn off the switch. (Receiver)

Turn off the switch. (Transmitter)

12

Retract the antenna. (Transmitter)

13

INCLUDED WITH KIT

Shock Oil

Phillips Type Screw Drivers ( S )

Needle Nose Pliers

Knife

Precision Caliper

Brush

Cross Wrench

1.5mm Allen Wrench

2.5mm Allen Wrench

Paints

Grease Box

PLASTIC PARTS USED

#30010
Main Gear Box

#36010 Lower arm, Rear (K)

#36030 lower arm, Front (K)

#30750 - Frt & Rr Cases
#30760 - Center Case

#30770 Bevel Gear
Set

#30200 Center Diff Mounts

#36060 C Hubs (K)

#36081 Rear Uprights
8mm (K & M)

#36020 Upper

«e¤WÂ\Áu

Arm, frt (K)

#36051 Knuckles, 8mm
(K)

#36710 Rear Support
bracket

#36690 Rear Upper Arm Ball
Ends 7mm

#36740 Servo Saver setr

#36780 Battery & Receiver Box

Plastic Post

Servo Mount

Radio Tray Post

#36700 Steering Ball Ends, 7mm

#30270 Rear Wing Support set7

#30800 Linkage, throttle (98)

Plastic Collar

Plastic Bearing

#36820 Chassis Stone Guards

SHOCK ASSEMBLY

1mm
Washer

2mm
Washer

#32237

O-Ring, rebuild
7mm
E-Ring

* E-Ring must
fit into groove as shown.

E-Ring

( Make 2 for front.)

Hard Coated Shocks:
Front Super Shock, 3.2mm

# 32290

Rear Super Shock, 3.2mm

# 32230

Shock Cylinder

* Assembly 4 pieces of the
shock Shaft .

#32051

6mm Ball End,
Plastic parts bag

* Fit into groove.

Oil Seal

#32203

Dust Pusher
(Yellow Rubber)

* Short shaft for front.

*Push Onto Shock
Cylinder

#32291

Front, Short(w-gt) Shaft, 3.2mm

Shock Shaft

#32236
Rear, Long Shaft, 3.2mm

2.6 x 5mm
Washer

Piston

Option:

#32039

O-ring Pistons

2.6mm Nut

( Make 2 for rear. )

#32051

6mm Ball End,
Plastic parts bag

FILLING THE SHOCKS WITH OIL

1. Pull down piston and pour oil into
shock cylinder. Remove air bubbles
by slowly moving piston up and down.

OIL

*Pull down.

2. Pull down piston, attach pressure top
and shock oil overflow with tissue
paper.

*Leave 3mm.

*Move Slowly.

* Long shaft for rear.

#32044

Shock Cap, Hard Coated

# 32033

Pressure Top

Fit into groove.

*

* Be careful not to damage shock shaft.

3. Tighten up shock cap.

* Screw down cap.

ASSEMBLY OF THE SPRING

#32051

All Plastic shock
parts bag

* Push 6mm ball joint
into ball end.

#37380

6mm
Ball Joint

Spring Holder

Optional:

#32330

Red Spring set

#32340

Yellow Spring Set

¼u®

*Slide spring collar into Shock.

Spring Collar

#32204

Spring Spacer Clips Set

1mm

3mm

5mm

*Spring Tension adjust .er

ASSEMBLY OF THE DIFFERENTIAL GEAR

#31322

Diff. Case ( Front/Rear )

#31323

Diff. Case (Center )

3 x 30mm
Cap Screw

* Fill diff. Case with grease
during assembly.

Optional Silicone Oil:
#10231 - 1,000 wtg
#10232 - 3,000 wtg
#10233 - 5,000 wtg
#10234 - 7,000 wtg
#10235 - 10,000 wtg
#10236 - 30,000 wtg
#10237 - 50,000 wtg

Grease

or

Silicone Oil

* Position the O-ring as shown.

#30779

0.5 x 26mm
O-Ring

#30779

O-Ring

#30771

Diff. Shaft

* Follow the number to tighten up
the screw.

1

#30779

2 x 12.8mm
Pin

#30779

4 x 10mm
Washer

#30770

Diff. Bevel Gear, Set

#30770

Diff. Bevel Gear, Set

#30779

4 x 10mm
Washer

#30770

Diff. Bevel Gear, Set

#30772

3.5mm
Cross Pin

#30779

2 x 12.8mm
Pin

#30779

4 x 10mm
Washer

#30779

4 x 10mm
Washer

* Fill the diff. Case to approx 80% with
grease.

Building Notes:

• Set gear mesh in differential by tightening all four screws
until diff locks. Then loosen each screw ¼ turn. Diff should
still be hard to turn, but will smooth out after running.

If diff is too loose, the internal gears will quickly ware out

• When tightening the four screws, look for one thread
coming out of diff cover.

ASSEMBLY OF THE BEVEL GEAR

( Build two differentials for front and rear. )

Screw
Cement

#90026

5 x 5mm
Set Screw

4

2

3

#30770

Diff. Bevel Gear, Set

#30120

Bevel Gear, 44T

Option:

#31010

HD Steel Bevel Gear, 44T

3mm
Tube

* Notice the diff case with the
straight holes are for front & rear.

#30121

Mounting Hardware
3 x 5mm Screw & tube

* Tighten the Diff. Screws

to the end of the case
with 1 or 2 threads

#90026

5 x 5mm
Set Screw

#30322

Diff Case, front / rear Complete

#30620

7 x 19x 5mm

#30082

Cap Joint, Long

Ballbearings

5 x 5mm Set Screw

3 x 5mm Screw

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

3mm
Tube

#30750

Diff Case, Bevel Gear

3 x 5mm
Screw

#30620

7 x 19x 5mm
Ballbearings

#30082

Cap Joint, Long

Screw
Cement

ASSEMBLY OF THE SPUR GEAR

#30111

3 x 10mm
Flat Head Screw & Nut

M3
Nylon Nut

#31323

Diff Unit, Center, Complete

#31040

Steel Spur Gear

#30760

Diff Case, Center

* Notice the tapered holes
are for the center diff. Only.

3 x 10 mm Flat Head
Screw

ASSEMBLY OF THE CENTER DIFF. MOUNT
U.S. Revision has Quad Brakes

#30170

Brake Joint

Screw
Cement

5 x 5mm
Set Screw

Installing Quad Brakes, requires
an 3x20mm screws

#30200

Center Diff. Housing
( Rear )

#30620

7 x 19x 5mm
Ballbearings

#36650

Brake Disk, Stainless

#30111

3 x 10mm
Flat Head Screw & Nut

#30620

7 x 19x 5mm
Ballbearings

#30200

Center Diff. Housing
( Rear )

5 x 5mm

#36650

Brake Disk, Stainless

Set Screw

Screw
Cement

#30170

Brake Joint

3 x 20mm
Screw

Quad Brakes

5 x 5mm Set Screw

3 x 20mm Screw

* Apply instant cement to glue brake pad and packing.

#36660

Brake Pad

#36661

Brake Pad
Packing

ASSEMBLY OF THE CENTER DIFF. AND BRAKE CAM

Screw

3 x 3mm
Set Screw

#30210

Brake Cam

Cement

#30171

Brake Lever, Lower

* Notice: The direction of the
brake cam.

#30210

Brake Cam

#30220

Center Plate

3 x 10mm
Tapping Screw

TO
FRONT

3mm

* Leave 3mm distance between
brake cam and nut.

TO
REAR

#30212

Bearing, Brake Cam
4X8mm Flanged

#30171

Brake Lever, Upper

Screw

Cement

3 x 3mm
Set Screw

#30212

Bearing, Brake Cam
4X8mm Flanged

0.5mm

Adjust brake pad spacing.

3 x 3mm Set Screw

3 x 10mm
Tapping Screw

ASSEMBLY OF THE GEAR BOX

( Assemble two gear boxes for front and rear. )

Step 1

* Insert two ball bearings
as shown.

#30630

6 x 13 x 5mm
Ball Bearing

Screw
Cement

#36730

Cap Joint

#30630

6 x 13 x 5mm
Ball Bearing

5 x 5mm
Set Screw

Step 2

* Place set screw on flat
of gear shaft.

GEAR
GREASE

#30130

Bevel Gear

You can use a shim
here if gear mesh
needs to be tighter.

#30779
Misc. Hardware

GEAR
GREASE

3 x 20mm Flat Head
Tapping Screw

#30010

Main Gear Box

#30010

Main Gear Box

* Make two gear boxes for front and
rear.

4 x 20mm
Flat Head
Tapping Screw

ASSEMBLY OF THE FRONT SHOCK TOWER

#36670

Alum. Blue Front
Upper Arm Holder

4 x 10mm
Tapping Screw

4 x 10mm
Tapping Screw

#36620

Front Shock Tower

#30340

Anti-roll Bar Kit

* Insert front stabilizer before
assembly shock tower.

ASSEMBLY OF PIVOT BALL TYPE (M STYLE) SUSPENSION

#36903

13.8mm Steering Ball x 4

#36901
Ball Type Knuckle Arm

( Right )

#36904
14mm Alum. Nut x 4

( Left )

#36905
Plastic Washer & Arm Adjusters

#36900
Front Upper Arm

#36890
Front Lower Arm

ASSEMBLY OF THE FRONT
SUSPENSION ARMS, M STYLE

Step 1

* Use 5mm
hex wrench.

#36903

13.8mm
Steering Ball

#36904

14mm
Alum. Nut

#36905

Steering Ball
Washer

#36901

Ball Type
Knuckle Arm
( Right and Left )

R

#36053

8x16mm
Ball Bearing

* Note the "R" mark
are for rightside.

R

* Adjusr alum. Nut to
keep steering ball
smoot.

#36902
Rear Lower Arm

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

#36052

CVA,
Constant Velocity Axle, 8mm

#36053

8x16mm
Ball Bearing

ASSEMBLY OF THE FRONT SUSPENSION ARMS, M STYLE

Step 2

#36055

2.5 x 17mm
Pin

5 x 5mm
Set Screw

#36054

Wheel Hub
( Alum. )

R

* Use 2.5mm
Hex Wrench.

5x5mm
Set Screw

Assembly of the right and left hand side

#36870

#36890

Front
Lower Arm

RR

4x10mm
Set Screw

are the same.

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

#36900

Front
Upper Arm

3mm

* Approx 3mm.

* Do not over tighten
5x5mm set screw.

4 x 10 mm
Set Screw

5 x 5mm
Set Screw

ASSEMBLY OF THE FRONT
SUSPENSION ARMS, M STYLE

Step 3

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

* Insert drive shaft
before assembly.

RR

3mm
E-Ring

#36720

Lower Arm
Stiffener
(Alum.)

3mm

4 x 10mm
Tapping Screw

3 mm E-Ring

4 x 10mm

1
0

Tapping Screw

#36630

Lower Arm Shaft

3mm
E-Ring

Step 4

ASSEMBLY OF THE FRONT SUSPENSION ARMS, M STYLE

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

3 x 3mm
Set Screw

#30340

6mm
Stabilizer
Ball End

RR

3mm
E-Ring

#30102

Front Body
Post

11

00

3x8mm
Tapping Screw

#36640

Upper arm Shaft

3mm
E-Ring

* Cut the sharded area
as shown.

3 x 3mm Set Screw

3 mm E-Ring

3 x 8mm
Tapping Screw

Step 5

#30401

6mm
Stabilizer
Ball End

#30411

6mm
Ball Joint

#30402

3 X 30mm
Tie Rod

#30401

6mm
Stabilizer
Ball End

3 x 15mm
Screw

* Insert stabilizer rod
through upper arm.

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

#36905

Arm Adjusters

1mm

RR

3mm

2mm

* Insert caster angle adjuster onto the
upper arm shaft.

* Change the position of the adjuster
to will change the caster angle.

11

00

18mm

0 10 20 30 40 50

mm

ASSEMBLY OF THE REAR SUSPENSION ARMS, M STYLE

* Follow the main instruction manual to assembly the rear lower arm M parts instead of K parts.

3 x 15mm Screw