OFNA Racing MBX R2 Plus User Manual

RTR Instruction

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

Manual

LIMITED EDITION
OFNA/PICCO .21
& BLUE BLAZER
RADIO

WITH

SERIALIZED CHASSIS

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

PRE-ASSEMBLED

ASSEMBLED CHASSIS WITH RADIO AND ENGINE

REQUIRED FOR OPERATION

THINGS NEEDED

Glow Fuel

20%

#10211 Battery Pack 1000 NiMh

5cell, flat............... $29.95

#10214 Battery Charger, Overnite
$7.95

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 fuels, they will over
heat engine.

• Buy long glow plugs, like OFNA/PICCO P-7 (#51007). Use plugs
without idle bar. Do NOT buy hot plugs, like the MC-59.

In your box you will find..

• #10218 - Red “C” size glow heater

51007

P-7S

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 batteries.

AA Batteries ( 12 pcs )

Recommendation:
You may want to upgrade the car battery pack to a Ni-Mh 5 cell Flat
type. This will give more run time.

TOOLS NOT INCLUDED IN KIT

Phillips Type Screw Drivers ( L )

Phillips Type Screw Drivers ( S )

Needle Nose Pliers

Instant Cemment

Cutter

Curved Scissors

Masking Tape

Brush

Cross Wrench
#17109 $3.95

Paints

Knife

Glow Plug & 17MM Cross Wrench
#10801 $6.95

READ THIS BEFORE RUNNING

Running a nitro kit is fun and easy, but to make this a safe • Clear 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.

• Don 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.

• Oil the air filter FOAM Element! OFNA #10015.. $9.95

• Set engine Master needle to 4 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.

Engine Break-in

• See Engine Page.

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.

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
INSTRUCTIONS WILL VOID
WARRANTY!

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.

CHECKING ENGINE THROTTLE

* Align throttle servo same
as shown.

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

1. Push trigger to full
brake position.

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

C

Brake ©

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.

B

C

B

A

C

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

ASSEMBLY OF THE AIR FILTER

#10016

Air Filter
Sponge
Refills

3 x 10mm
Tapping Screw

#10021 - Black
#10027 - Yellow
#10028 - Pink

Nylon Strap
( Small )

#10029 - Blue

Air Filter Connector

Nylon Strap
( Small )

#10017 - Blue
#10018 - Yellow
#10019 - Rose

Foam Air filters Unit

You must oil foam filter before use.

#10015, Foam
Filter oil, Very

Sticky....$9.95

Filter will not work if not oiled.

Clean with soap and water only.
You will damage foam if washed
if fuel!

PLASTIC PARTS USED

#30010
Main Gear Box

#30751 - Frt & Rr Cases
#30761 - Center Case
(K type cases)

#36902 Lower arm, Rear (K), Straight type

#36011 lower arm, Front (K), Straight type

#30769 Bevel Gear
Set, for K type case.

#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 set

#36780 Battery & Receiver Box

Plastic Post

Servo Mount

Radio Tray Post

#36700 Steering Ball Ends, 7mm

#30270 Rear Wing Support set

#30800 Linkage, throttle kit

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, 3.5mm

# 32290

Rear Super Shock, 3.5mm

# 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

#32235

Teflon Piston Set

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 NEW “K” STYLE DIFFERENTIAL CASE AND GEARS

#31324 - FRONT OR REAR DIFF UNIT
#31325 - CENTER DIFF UNIT

30779
2 x 12.8mm
Pin

* Position the O-ring
as shown.

30751 Diff. Case ( Front/Rear )
30761 Diff. Case (Center )

30779
2 x 12.8mm
Pin

30771
Diff. Shaft

30779
P5 O-Ring
( Orange )

30779

0.5 x 26mm
O-Ring

30769
Diff. Bevel Gear
( Large )

30779
4 x 10mm
Washer

* Apply diff. Gear grease to the
differential, during assembly.

* Fill the diff. Case to
approx 70% with grease.

Grease

30769
Diff.
Bevel Gear
( Small )

30773
4mm
Cross Pin

30769
Diff.
Bevel Gear
( Small )

30773
4mm
Cross Pin

30779
4 x 10mm
Washer

30769
Diff.
Bevel Gear
( Small )

30779
4 x 10mm
Washer

NB. It is very important to remove
the 30779 shim if the mesh
is too tight.

30771
Diff. Shaft

30769

Diff.

Bevel Gear

( Large )

ASSEMBLY OF THE BEVEL GEAR

( Builds two differentials for front and rear. )

30120
Bevel Gear
(Large/Metal)

31010
Optional - Bevel Gear
(Harden Steel)

30121
3mm
Tube

30779
P5 O-Ring
( Orange )

30121
3 x 5mm
Screw

30751 Diff. Case ( Front/Rear )
30761 Diff. Case (Center )

Scre

Ce

w

ment

36730
Cap Joint

90026
5 x 5mm
Set Screw

30620
7 x 19mm
Bal lbearings

90026
5 x 5mm
Set Screw

3x10mm
Tapping Screw

3x10mm
Tapping Screw

Scre

w

t

en

m

Ce

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

* Notice the straight holes
are for front and rear.

30121
3mm
Tube

30121
3 x 5mm
Screw
(Small Head)

5 x 5mm
Set Screw

3 x 5mm
Screw

30620
7 x 19mm
Ball bearings

39730
Cap Joint

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

#30201

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

#30201

Center Diff. Housing
( Rear )

5 x 5mm

#36650

Brake Disk, Stainless

Set Screw

Screw
Cement

#30170

Brake Joint

3 x 20mm
Screw

* Apply instant cement to glue brake pad and packing.

#36660

Brake Pad

#36661

Brake Pad
Packing

5 x 5mm Set Screw

3 x 20mm Screw

ASSEMBLY OF THE CENTER DIFF. AND BRAKE CAM

Screw

3 x 3mm
Set Screw

#30213

Brake Cam

Cement

#30171

Brake Lever, Lower

* Notice: The direction of the
brake cam.

#30213

Brake Cam

#30652

Center Plate

3 x 10mm
Tapping Screw

TO
FRONT

3mm

Parts drawn are not shown correctly.
A few parts have been changed and may
look different, but part numbers reflect the
new parts.

* 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