OFNA Racing LD3 Pro User Manual

LD-3 PRO VERSIONLD-3 PRO VERSION

REQUIRED FOR OPERATION

THINGS NEEDED

Glow Fuel

20%

AA Batteries ( 12 pcs )

#10211 NiHm Flat Pack,
see charger 10214.

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.

• Rear Exhaust .12 engine with SG crankshaft and Slide Carb.

• Buy SHORT glow plugs, OFNA/PICCO Plug (#51007) are long
therefore use two copper washers. Use plugs without idle bar. Always
use two copper washers with Picco glow plugs.

I

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, Alkaline type batteries will work, but
braking will be reduced. The best is to use a 5 cell hump pack for increased
voltage..

Recommended Option:
You may want to upgrade the car battery pack to a Ni-Cad or NiHm 5 cell

#10212 NiHm Hump Pack,
see charger 10214.

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

Phillips Type Screw Drivers ( L )

Phillips Type Screw Drivers ( S )

Needle Nose Pliers

type(600AE). This will give more run time. OFNA # 10211 or 10212 1000NiMh
Hump Pack and NiHm Battery Charger #10214

Cutter

Curved Scissors

Instant Cement

Cross Wrench
#17109 $3.95

10214
Over-nite
Charger

Diff Oil ­Silicone

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 Precautions
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 car or property.
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 flammable and poisonous.
healthy.

Glow Fuel label for additional precautions.

• Glow fuel is poisonous!

• Glow fuel is flammable! • Car Fuel tank - Never store fuel in car tank, it will ruin the

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

• 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.

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

• 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

• 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

• Glow fuel - Do leave the glow fuel unattended with the lid
off. Fuel contains Methanol and Nitro Methane and is

Store fuel in cool ventilated location. Refer the glow fuel

engine if left in tank.

• Always turn off the car BEFORE turning off radio.

• DAMAGE DUE CAR RUN AWAY IS NOT A WARRANTY
ISSUE.

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.

• Clean oil and dirt from chassis with a degreaser.

INSTRUCTIONS WILL VOID
WARRANTY!

CHECK RADIO SETTING AND
LINKAGE BEFORE STARTING

THE NEXT 3 PAGES ARE THE ADDENDUM
INSTRUCTION FOR THE LD-3 PRO KIT

Front Diff

Parts Upgrade

38410 - Front One-Way

PRO FRONT ONE WAY ASSEMBLY

37967
O-Ring

38413
CAP JOINT

37450
10x15x4mm

Ball Bearing

38411
One Way

38412
Large
Bevel Gear
(steel)

94052
M2x6mm
Flat Head
Screw

37450
10x15x4mm
Ball Bearing

38413
CAP JOINT

Standard 4 Diff. Gear

13T

13T

Parts Upgrade

38403 - 6 Gears Diff. Set

Must 12T gear with 6 gear setup.

12T

12T

94052
M2x6mm
Flat Head
Screw

PRO ASSEMBLY OF THE REAR DIFFERENTIAL

Step 1

Step 3

Step 4

Step 1

38255
Cap Joint

37450

10x15mm

Bearing

38252
Diff.Case

38278
5x8x1.5mm

O-Ring

38256
10T Diff.Gear
(small)

38404
3x17.8mm
Cross Pin

38256
10T Diff.Gear
(small)

Step 2

94045
2mm

E-Ring

38278
5x10mm
Washer

38402
12T Diff.Gear
(Large)

94045
2mm

E-Ring

Put the grease into the diff.
case before assembly.

38278
5x10mm
Washer

Step 5

38402
12T Diff.Gear
(Large)

38278
5x8x1.5mm

O-Ring

38416
Large Bevel Gear
(Steel)

37450
10x15mm
Bearing

38287
Diff.Gasket

37967
O-Ring

38255
Cap Joint

94051
M2x6mm

Flat Head
Tapping Screw

39053 Upper & Lower Arms

Parts Upgrade

38399 Upper & Lower Arms (F&R)

38256
10TDiff.Gear

38256
10T Diff.Gear
(small)

38404
3x17.8mm

Cross Pin

(small)

PRO ASSEMBLY OF THE FRONT SUSPENSION

*For the Front knuckle assembly,
please use page 6 of 1.

Front knuckle
arm Assembly

94035
3x8 mm
Set Screw

38399
Front Lower Arm

38399
Front Upper Arm

M2x6mm
Flat Head
Tapping Screw

38268 - Rear Drive Shaft

PRO ASSEMBLY OF THE REAR HUB

Parts Upgrade

CVA Joint

38405

Rear Upper Arms

Parts Upgrade

38399 - Rear Upper Arms

39150
10mm Alum.
Set Screw

39140
8mm
Steering Ball

38266
8mm
Steering Ball
Washer

*Notice the direction
of the steering ball washer.

37430
5x11x4mm
Ball Bearing

38266
Rear Wheel
Hub

PRO ASSEMBLY OF THE REAR SUSPENSION ARMS

Step 1

38399
Rear Lower Arm

Step 2

37450
10x15x4mm
Ball Bearing

38405
CVA Joint

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

38399 Rear Upper Arm
Ball End

38399 Rear Upper Arm
Ball End

38398
3x20mm
Turnbuckle

Rear Lower Arms

Parts Upgrade

38399 - Rear Lower Arms

Step 3Step 3

37370
6mm
Ball&Socket

94004
M3x12mm
Screw

Insert the upper arm shaft after assembly the shock tower.

38270

90020

2.5mm
E-Ring

Shock Tower

Step 4

94019
M3x10mm
Flat Head
Hex Screw

38419
Lower Arm Shaft

For assembly front roll bar:

* Use a 3mm drill to drill
a hole in the arm holder
before assembly.

* Use the 0 degree
for rear arm holder.

38263
Arm Holder
(Rear / Rear)

38261
Rear Upper shaft

90020

2.5mm
E-Ring

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

38417 - Blade Swaybar Set

38319 - CHASSIS 2.5mm

Parts Upgrade

38489 - CHASSIS 3.0 mm Ld3 Pro

3 Shoes Flywheel 34mm, Pull Start

38284 -

Parts Upgrade

PRO ASSEMBLY OF THE STABILIZER INTO ARM BLOCK

* Assembly the rear anti-roll bar same as the front.

94033

Step3

M3x3mm
Set Screw

38419
3x55mm
Lower Arm
Shaft

Step1

M3x15mm
Screw

38418rs
Mount

38418
Stabilizers
Balance
Adjuster

94033
M3x3mm
Set Screw

* Keep stabilizer ball in the center.

94033
M3x3mm
Set Screw

Step2

38418
Stabilizers
Mount

94005
M3x15mm
Screw

38420
Stabilizers
blades

ASSEMBLY OF THE FLYWHEEL

SG Type Engine

10330
Split Cone

38285
3 Shoes Flywheel
(Small/30mm)

10100

Clutch Spring

10010
Clutch Shoes

Center

* Turn stabilizer balance adjuster to
adjust the stabilizer to the same angle.

* Place the clutch shoes
with the clutch springs
over the 3 pins of the
flywheel.

Using a small screw driver
or needle nose pliers and push
the small end of the clutch
spring behind the pilot shaft
nut and down.

If installed correctly, the shoes
will be held in with spring
tension.

- 3 Shoes Flywheel, non-pull Start

38285

(Small/30mm)

10063 - polished 6 Ring Pipe

38286 - Side Exht Manifold

Parts Upgrade

38475 - Polished
IN-LINE REAR EXHAUST PIPE

Pull Start Engine Mounts
#38150
Non-Pull Start Engine Mounts
#38453

10098
SG
Clutch Nut

PRO ASSEMBLY OF THE MANIFOLD AND MUFFLER

38477 - Manifold
In-Line Rear Exhaust Manifold
Polished

97501
Manifold Spring

* Put the clutch spring into the groove
of the clutch shoesbefore assembly.

10121
Manifold Spring

38476 - Pipe
In-Line Rear Exhaust Manifold
Polished

FOLLOWING PAGES INCLUDE ASSEMBLY
FOR LD-3 RTR AND LD-3 PRO

ASSEMBLY OF THE 4 GEAR DIFFERENTIAL

(Build two differentials for front and rear.)

Step 1

Step 3

38255
Cap Joint

37450
10x15x4mm
Ball Bearing

94051
M2x6mm

Flat Head
Tapping
Screw

2mm
E-Ring

O-Ring
5x8x1.5mm

38252
Diff.Case

38278

5x8x1.5mm

O

38278

38253

3x17.8mm
Pin

5x8x0.8mm

5x10mm

Washer

Washer

Step 2

5x10mm
Washer

38256
10T Diff.Gear
(small)

Put the grease into the diff. case
before assembly.

38256

10T Diff. Gear

(small)

2mm

E-Ring

37771
13T
Diff. Gear

2mm
E-Ring

37771
13T
Diff. Gear

(Large)

37771
13T Diff. Gear
(Large))

(Large)

5x10mm
Washer

Step 4

37450
10x15x4mm
Bearing

O--RRiinngg

38278
5x8x1.5mm

38255
Cap Joint

38257
Large
Bevel Gear

38257
Large
Bevel Gear

37450
10x15x4mm
Ball Bearing

38287
Diff.Gasket

Note: Peel off backing

38253
3x17.8mm
Pin

38255

Cap Joint

M2x6mm
Flat Head
Tapping Screw

38256
10T Diff.Gear
(small)

ASSEMBLY OF THE FRONT GEAR BOX

(Build a gear box for front.)

NOTE: DIFF GEARS AND PINION WILL
FEEL ROUGH UNTIL YOU RUN CAR. DO
NOT SHIM GEAR CASE FOR
SMOOTHNESS OTHERWISE GEAR WILL
STRIP.

38251

Step 1

Gear case

3x3mm
Set Screw
94033

90020

2.5mm
E-Ring

38254
12x15x0.25mm
Shim

38258

37430

16T
5x11x4mm
Ball Bearing

*Adjust the backlash

Bevel Gear
(small)

*Use 2 pcs in this side.

with the shim*

E-Ring

16T

90020

2.5mm

38259

16T

5x8x0.8mm
Washer (important)

38258

Bevel Gear
(small)

Bevel Gear

(small)

Shaft

16T

38259

3x3mm
Set Screw

Bevel Gear

(small)

Shaft

* Put the gear in the
right position.

37430
5x11x4mm
Ball Bearing

37430
5x11x4mm
Ball Bearing

M2x6mm
Flat Head
Tapping Screw

38260
Bevel Gear

16T

Cap Joint

*Check the right space
between two ball bearings.

ASSEMBLY OF THE FRONT GEAR BOX

(Build a gear box for front.)

Step 2

* The gear box after assembly.

38251
Gear Case

38251

Gear Case

M2.6X10mm
Screw
94050

M3X12mm
Screw
94004

M2.6X10mm
Screw
94050

M2.6X10mm
Screw
94050

38321

M3X12mm

Screw
94004

ASSEMBLY OF 2-SPEED CLUTCH TRIGGER DISC

SCREW AS SHOWN,
LEVEL WITH HOLE EDGE

SCREW AS SHOWN,
LEVEL WITH HOLE EDGE

SET BALL TO REST ON CAM, NOT PUSHING. IF
TOO TIGHT, THE BALL WILL PUSH ON CAM
SPREADING SHOE DISC AND WILL NOT FIT
INTO ALUM. CLUTCH BELL #38296

CARE MUST BE TAKEN TO BUILD
THIS ASSEMBLY CORRECTLY,
OTHERWISE 2-SPEED WILL NOT
ADJUST AND MAY NOT WORK AT ALL.
IN FACT, IF 2-SPEED DOES NOT
SHIFT, CHECK OUT THIS ASSEMBLY!.

Step 2

M2x10mm

Screw

3x3mm

38313

Spring

Set Screw

38312

Clutch Shoe

M2x10mm
Screw

ASSEMBLY OF THE TWO SPEED GEAR

Step 1

4x4mm

Set Screw

38323

2 Speed Main Shaft

94034
4x4mm

Set Screw

Note: Must use Locktite

38316

Clutch Shoe
Carrier

38312

Clutch Shoe

38315

Metal Ball

94033
3x3mm

Set Screw

38315

Metal Ball

38313

Spring

94033
3x3mm

Set Screw

38313

Spring

3x3mm
Set Screw

M2x10mm

Screw

ASSEMBLY OF THE TWO SPEED GEAR

Step 3

38300
38T
Spur Gear

38T

Step 4

M3x4mm
screw

37400
2x8.8mm
Pin

38295
1 st Gear Carrier

38279
3x14.8mm
Pin

38296

2nd Gear
Clutch Bell
(Ball Bearing)

(One-Way)

37430
5x11x4mm
Ball Bearing

38301

42T
Spur Gear

42T

38258
16T
Bevel Gear
(Small)

90020

2.5mm

E-Ring

38297
Retaining Ring

38297

Retaining Ring

38258

16T
Bevel Gear
(Small)

90020

2.5mm
E-Ring

*Insert the 382790 into
Break disc mount.

38279
3x14.8mm
Pin

38289
Brake Disc

Mount

38321
M3x4mm

screw

Note: Must use Locktite

37430

5x8mm
Washer

5x11x4mm
Ball Bearing

40042
Brake Disk

*Put the brake disk on
before assembly

37400
2x8.8mm
Pin

38289
5x8mm
Plastic

37430

5x11x4mm
Ball Bearing

5x8x0.8mm
Washer

37430
5x11x4mm

Ball Bearing