OFNA Racing Mutilator User Manual

REV 5-7-07

WWW.OFNA.COM

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!

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..

• #10162- Bottle, 250cc

• #10219 - Red “D” size glow heater

10195

7.2 Volt
Over-nite
Charger

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

• Radio TX needs (8) eight AA batteries.

• Shaft Starter requires a 7.2Volt battery pack and charger OFNA #10195

• Car needs (4) four AA Ni-cad batteries 2000Mah or higher 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..

10214
Rec’v Bat.
Over-nite
Charger

#10212 Rec’v Bat.
NiHm Hump Pack,
see charger 10214.

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 1400NiMh Hump Pack and NiHm Battery Charger #10214

TOOLS NOT INCLUDED IN KIT

Cross Wrench
#17109 $3.95

Phillips Type Screw Drivers ( L )

Phillips Type Screw Drivers ( S )

Glow Plug & 17MM Cross Wrench
#10801 $6.95

Cutter

Curved Scissors

Precision Caliper

INCLUDED WITH KIT

Diff. Oil

Instant Cemment

Shock Oil

1000 3000 5000

Masking Tape

1.5mm Allen Wrench

2mm Allen Wrench

Needle Nose Pliers

Knife

Brush

Paints

2.5mm Allen Wrench

4mm'5mm Allen Wrench

1

ASSEMBLY OF THE FRONT AND REAR DIFF.

Step1

40006
Cap Joint

36053
8X16mm
Ball Bearing

40003
Diff. Case

Step2

40004Diff. Gear
(Large)

Builds two differentials for front and rear.

400102.5X13.8mmPin

40009P6-Oring

49032
43T Large
Bevel Gear

40010 .......X2

2.5X13.8mm
Pin

94034

4X4mm ........X1

Set Screw

40009 ........X2

P6 O-Ring

30779 ........X4

4X10mm
Washer

94020

3X12mm ........X4

Flat Head
Hex Screw

940344x4mmSet Screw

400102.5X13.8mmPin

Step3

30779
4X10mm
Washer

40004
Diff. Gear
(Small)

40009
P6-Oring

40004Diff. Gear
(Large)

30773
4mm
Cross Pin

*Apply diff. gear grease
to the differential, during
assembly .
*Fill the diff. case to
approx. 80% with grease.

Step4

40011
Diff. Gasket

36053
8X16mm
Ball Bearing

94020
3X12mm
Flat Head
Hex Screw

40006
Cap Joint

2

ASSEMBLY OF THE CENTER DIFF.

40005

Step1

40010 .......X2

2.5X13.8mm
Pin

94034

4X4mm .......X1

Set Screw

40009 .......X2

P6 O-Ring

30779 ........X4

4X10mm
Washer

Break
Cap Joint

Step3

94034
4x4mm
Set Screw

40004
Diff. Gear
(Small)

36053
8X16mm
Ball Bearing

40010

2.5X13.8mm

Pin

307794X10mmWasher

40003Diff. Case

30773
4mm
Cross Pin

40009P6-Oring

Step2

40004
Diff. Gear
(Large)

40004Diff. Gear
(Large)

40010

2.5X13.8mm
Pin

Step4

40009P6-Oring

40011
Diff. Gasket

40134
62T
Spur Gear

360538X16mmBall Bearing

40005
Break
Cap Joint

94020

3X12mm ........X4

Flat Head
Hex Screw

*Apply diff. gear grease
to the differential, during
assembly.
*Fill the diff. case to
approx. 80% with grease.

1

94020
3X12mm
Flat Head
Hex Screw

3

ASSEMBLY OF THE FRONT GEAR CASE

94036

5X4mm ......X1

Set Screw

94011

4X16mm ......X2

Hex Screw

40024 ......X2

13X16X0.2mm
Shin

40024
13X16X0.2mm
Shim

94011
4x16
Hex Screw

Adjust the backlash
with the shims.

40017
Gear Case

49012
13T Small
Bevel Gear

36053
8X16mm
Ball Bearing

40024
13X16X0.2mm
Shim

36053
8X16mm
Ball Bearing

40017
Gear Case

94036
5X4mm

S

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Set Screw

36730
Cap Joint

4

ASSEMBLY OF THE FRONT ARMS HOLDER

40015
Front Lower Arm
Holder(Rear/Plastic)

40015
Front Upper Arm
Holder
(Rear/Plastic)

94027
4X16mm
Flat Head
Hex Screw

94027

4X16mm ......X4

Flat Head
Hex Screw

94014

4X45mm .... ..X2

Hex Screw

94014
4X45mm
Hex Screw

40022
Front Lower
Arm Holder

2

5

ASSEMBLY OF THE FRONT SHOCK STAY

40117
Body Post

94004

3X12mm .......X4

Hex Screw

94010

4X12mm .......X4

Hex Screw

94012

4X20mm .......X2

Hex Screw

35313

M 3 ........X2

Nylon Nut

35314

M4 ........X2

Nylon Nut

35313
3mm
Nylon Nut

40117
Body Post
Mount

94010
4X12mm
Hex Screw

94010
4X12mm
Hex Screw

94012
4X20mm
Hex Screw

40116
Alum Front
Shock Stay

40531
Shock Ball
End Post

94004
3X12mm
Hex Screw

90018
3X25mm
Screw

35314
4mm
Nylon Nut

90018

3X25mm ........X2

Screw

ASSEMBLY OF THE FRONT KNUCKLE ARMS

6

40135
Universal Joint
(Front)

40103
Alloy front
Knuckle Arm

36055 .......X2

2.5X17mm
Pin

94036

5X4mm .......X2

Set Screw

7

ASSEMBLY OF THE FRONT LOWER ARMS

(Left)

36053
8X16X5mm
Ball bearing

94004
3X12mm
Hex Screw

36055

2.5X17mm
Pin

94036
5X4mm
Set Screw

36053
8X16X5mm
Ball bearing

36054
Alum.
Wheel Hub 8mm

36054
Alum.
Wheel Hub 8mm

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Sc

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C

94010
4X12mm
Hex Screw

w

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S

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Ce

36053
8X16X5mm
Ball bearing

94036
5X4mm
Set Screw

36055

2.5X17mm
Pin

t

40103
Alloy front
Knuckle Arm
(Right)

40135
Universal Joint
(Front)

36870

4X10mm .......X2

Set Screw

40104
10mm
Ball and Socket

40102
Front Lower Arm
(Right)

36870
4X10mm
Set Screw

3

36870
4X10mm
Set Screw

40102
Front Lower Arm
(Left)

40104
10mm
Ball and Socket

36870
4x10mm
Set Screw

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

8

ASSEMBLY OF THE FRONT UPPER ARMS

Approx. 11mm

36860 .......x2

5X35mm
Turnbuckle

9

ASSEMBLY OF THE FRONT SUSPENSION ARMS

40101
Front Upper
Arm(Left)

36860
5X35mm
Turnbuckle

40101
Front Upper
Arm Ball End

40104
10mm
Ball and Socket

40101
Front Upper
Arm Ball End

40104
10mm
Ball and Socket

36860
5X35mm
Turnbuckle

40101
Front Upper
Arm(Right)

Assembly for both right and left side

90021
3mm
E-Ring

90020

2.5mm .......X4

E-Ring

40104

4X16mm .......X2

Cap Screw

40023
Lower Arm
Shaft(4mm)

90021
3mm
E-Ring

Insert the front drive shaft into
cap joint before assembly
the front lower arm.

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C

40104
4X16mm
Cap Screw

90020

2.5mm
E-Ring

36170
Arm Shaft(3mm)

90020

2.5mm
E-Ring

40104
4X16mm
Cap Screw

w

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S

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C

10

CLIP IN THE CASTER ADJUSTER

40101
Caster Adjuster

Assembly for both right and left side

*Use adjuster to change
the caster angle.

A

B

Caster Adjuster

*Caster angle will
become bigger.

A

B

*Caster angle will
become less.

A B

4

11

ASSEMBLY OF THE FRONT STABILIZER

* Makes two stabilizer rods for use.

30341
Stabilizer Ball

40029
Stabilizer
Ball End

94035
3X8mm
Set Screw

40199
Stabilizer
Ball End

Assembly for both right and left side

30403
6mm
Ball End

94035
3X8mm
Set Screw

94033
3X3mm
Set Screw

94003
3X10mm
Hex Screw

94005
3X16mm
Hex Screw

24

12

ASSEMBLY OF THE SERVO SAVER

* Take the plastic bushing
from servo saver plastic
parts tree.

......X2

......X2

......X4

......X2

40032
Servo Saver
Connecting Plate

40037
Steering Plat
Hex Screw

40017
Stabilizer
Mount Plastic

94003
3X10mm
Hex Screw

*Do not tighten 40037
Hex Screw too tight.

40031
4X8mm
Plastic Flange
Bushing

40037Steering Plat
Hex Screw

40017
Stabilizer
Mount Plastic

94005
3X16mm
Hex Screw

40019
Stabilizer

40035
Servo Saver
Alum. Tube

40031
Servo Saver
Horn A

40031Servo Saver
Horn B

94033
M3X3
Set Screw

94009
4X10mm
Hex Screw

94033
M3X3
Set Screw

94004
3X12mm
Hex Screw

940094X10mmHex Screw

40030
Front plate

94004

3X12mm .........X1

Hex Screw

94009

4X10mm .........X2

Hex Screw

40031PlasticBushing

40031Servo Saver
Horn C

40031PlasticBushing

40033
Servo Saver
Spring(Black)

40034
Servo Saver
Spring Tension
Adjuster

40036
Servo Saver
Post

40018
Center Chassis
Bracer (Front)

5

13

ASSEMBLY OF THE STEERING RODS

40038
7mm Ball

94021

3X15mm ........X2

Flat head Hex Screw

94022

3X18mm ........X2

Flat head Hex Screw

94009

4X10mm ........X2

Hex Screw

94041

3mm ........X2

Nylon Nut

ASSEMBLY OF THE FRONT BUMPER

14

94004
3X12mm
Hex Screw

36700
7mm Steering
Ball End

40006
Turnbuckle

36700
7mm Steering
Ball End

40137
Front
Bumper(B)

40039
3mm
Tapper Washer

Approx 34.8mm

94041
3mm
Nylon Nut

40038
7mm Ball

94022
3X18mm
Flat head
Hex Screw

40137

Front Bumper(D)

94021
3X15mm
Flat head
Hex Screw

40039
3mm
Tapper Washer

Front Bumper(C)

40137

94009
4X10mm
Hex Screw

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S

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C

94021
3X15mm
Flat head
Hex Screw

Screw

Cement

40039
3mm
Tapper
Washer

94003
3X10mm
Hex Screw

94003

3X10mm ........X6

Hex Screw

94004

3X12mm ........X3

Hex Screw

ASSEMBLY OF THE REAR GEAR CASE

15

94011

4X15mm .......X2

Hex Screw

94011
4X15mm
Hex Screw

40024
13X16X0.2mm
Shim

94004

Hex Screw

3X12mm

40137Front Bumper(A)

40137

Front Bumper(D)

40676
Bumper
Washer

49012
Small
Bevel Gear

36053
8X16mm
Ball Bearing

40017
Gear Case

94004
3X12mm
Hex Screw

36053
8X16mm
Ball Bearing

40024 ........X2

13X16X0.2mm
Shim

4002413X16X0.2mmShim

40017Gear Case

6

ASSEMBLY OF THE REAR ARMS HOLDER

16

94036

5X4mm .......X1

Set Screw

40025

94011
4X15mm
Hex Screw

Rear Lower
Arm Holder

94003

3X10mm .......X1

Hex Screw

94009

4X10mm .......X2

Hex Screw

94011

4X15mm .......X2

Hex Screw

.......X2

94030
4X45mm
Flat Head
Hex Screw

17

ASSEMBLY OF THE REAR SHOCK STAY

94036
5X4mm
Set Screw

36730
Cap Joint

S
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ne

94030
4X45mm
Flat Head
Hex Screw

40015
Rear Arm
Holder

90018
3X25mm
Cap Screw

S

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C

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en

t

94003
3X10mm
Hex Screw

40027
Win Stay
Mount

94009
4X10mm
Hex Screw

40137
Body Post
Plastic

94003

3X10mm .......X1

Hex Screw

94004

3X12mm .......X2

Hex Screw

90018

3X25mm .......X2

Cap Screw

40027
Rear Body
Post

94003
3X10
Flat Head
Hex Screw

40531
Shock Ball End
Post

94004
3X12mm
Hex Screw

94003
3X10mm
Hex Screw

40531
Shock Ball End
Post

S

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C

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t

40026
Rear Shock Stay

90018
3X25mm
Cap Screw

94019

3X10 .......X2

Flat Head
Hex Screw

7

18

ASSEMBLY OF THE WING STAY

40027
Wing Stay

Step1

Post

40027
Wing Stay(Left)

40027
Wing Mount

94007
3X20mm
Hex Screw

Step2

40027
Wing Stay(Right)

40027
Wing Mount

94005
3X16mm
Hex Screw

94007
3X20mm
Hex Screw

94005

3X16mm .......X2

Hex Screw

.......X5

94007
3X20mm
Hex Screw

94011

4X16mm .......X6

Hex Screw

94042

4mm .......X2

Nylon Nut

94011
4X16mm
Hex Screw

Step3

94005
3X16mm
Hex Screw

40018
Center Chassis
Bracer(Rear)

94007
3X20mm
Hex Screw

94042
4mm
Nylon Nut

94011
4X16mm
Hex Screw

94042
4mm
Nylon Nut

Step4

94011
4X16mm
Hex Screw

19

ASSEMBLY OF THE REAR WHEEL HUBS

94036

5X4mm .....X1

Set Screw

36870

4X10mm .....X1

Set Screw

90020

2.5mm ......X2

E-Ring

36055 ......X1

2.5X16.8mm
Pin

36053
8X16X5mm
ball baring

36082
Rear Wheel
Axis Shaft

36055

2.5X16.8mm
Pin

36081
Wheel
Rear Hub

94036
5X4mm
Set Screw

36054
CNC Alum.
Wheel Hub 8mm

36053
8X16X5mm
ball baring

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

8

36870
4x10mm
Set Screw

90020

2.5mm
E-Ring

36870
4X10mm
Set Screw

36170
3mm Arm Shaft

Assembly for both right and left side

40102
Rear Lower Arm

36081
3mm
Plastic Washer

90020

2.5mm
E-Ring

36081
3mm
Plastic Washer

20

ASSEMBLY OF THE REAR SUSPENSION ARMS

90021
3mm
E-Ring

90021
3mm
E-Ring

Assembly for both right and left side

90021

3mm .......X4

E-Ring

21

ASSEMBLY OF THE REAR SUSPENSION ARMS

Step1

40065
Upper Arm
Plastic Rod End

94041

3mm .......X4

Nylon Nut

94006

3X18mm .......X2

Cap Screw

94008

3X25mm .......X2

Cap Screw

ASSEMBLY OF THE REAR STABILIZER

22

36850
7mm Ball

36861
Turnbuckle

Approx. 32.2mm

40023
4mm
Lower Arm Shaft

40065
Upper Arm
Plastic Rod End

36850
7mm Ball

Step2

30341
Stabilizer

94006
3X18mm
Cap Screw

40029
Stabilizer
Ball End

40107
Rear Driver
Shaft(104mm)

94008
3X25mm
Cap Screw

Assembly for both right and left side

94041
3mm
Nylon Nut

94041
3mm
Nylon Nut

Assembly for both right and left side

94033

3X3mm ........X2

Set Screw

94035

3X8mm ........X2

Set Screw

94003

3X10mm ........X4

Hex Screw

94005

3X16mm ........X2

Hex Screw

94005
3X16mm
Hex Screw

94003
3X10mm
Hex Screw

40017
Stabilizer
Mount Plastic

9

94035
3x8mm
Set Screw

30403
6mm
Ball End

40029
Stabilizer

94033
3X3mm
Set Screw

40199
Stabilizer

94033
3X3mm
Set Screw