Ultra MBX R2 User manual

THINGS NEED BESIDES THE KIT
RADIO CONTROL UNIT
12V Battery for Starter Box
(must have)
Glow Plug Heat with Battery & Charger
# 10227....$$19.95
(please note OFNA Glow Heats available)
AA Batteries ( 12 pcs ) for radio
Note: Careful read the instruction manual of your
2 channel radio controller before using.
Radio must be set at neutral position
before installing in the kit.
SEQUENCE TO SET NEUTRAL
Note: The engine may not include in kit.
Glow Fuel
20%
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.
Turn off the switch. (Receiver)
Turn off the switch. (Transmitter)
Retract the antenna. (Transmitter)
1111
12
13
REQUIRED FOR OPERATION
Bottle’s with spout
# 10160 - large 500cc
# 10161 - large 500 ccAuto Stop
# 10162 - small 250cc
# 10164 - CNC spout 500CC
INCLUDED WITH KIT
Shock Oil
1.5mm Allen Wrench
2.5mm Allen Wrench
Grease Box
SUITABLE SERVO SIZE
29mm - 42mm
15mm - 21mm
36mm-41mm
3.5 cc (21 Class) ENGINE
REAR EXHAUST
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
TOOLS NOT INCLUDED IN KIT
Phillips Type Screw Drivers ( L )
Phillips Type Screw Drivers ( S )
Needle Nose Pliers
Cutter
Curved Scissors
Knife
Instant Cement
Cross Wrench
#17109 $3.95
Glow Plug & 17MM Cross Wrench
#10801 $6.95
Masking Tape
Paints
Grease
Brush
More Optional Parts . . .
#10211 NiHm Battery Flat
Pack .. $29.95
# 10214 NiHm Battery Pack
Charger.. $7.95
OFNA/Picoo Glow Plug ..
$4.95

READ THIS BEFORE RUNNING
Running a nitro kit is fun and easy, but to make this a safe rusting.
• 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 Precautions
injure someone if you are not careful. • This kit is not a toy. Always run car with a second
person as a spotter and pitman.
Where to run car?
• Any running area you choose must be dry. Do not run • Hot Parts - The pipe, manifold, engine and head are very
car near any water or wet dirt. hot and will cause burns.
• Do not run on public streets. It is very easy to have the
car run over or damaged by hitting the curb. • Rotating Parts - Keep hands away from the drive train,
• Do not operate car in tight confined places. The car is wheels, and engine when engine is running.
very fast and will easily hit something.
• Do not run near people or animals. • Radio - Check batteries life before running the car. If
radio does not have full control of the car with steering
• Due noise, you will want to consider the surrounding and/or throttle/brake do not run until corrected. Failure to
area when operating the car. correct this will result in possible injury and damage to the
• Do not operate the car at night. You will not be able to car or property.
drive it without hitting something.
• Do not operate the car indoors. Engine exhaust is not • Glow fuel - Do leave the glow fuel unattended with the lid
healthy. off. Fuel contains Methanol and Nitro Methane and is
flammable and poisonous.
Glow Fuel
• Glow fuel is poisonous! Store fuel in cool ventilated location. Refer the glow fuel
• Glow fuel is flammable!
• Do not leave in fuel bottle with lid off at any time. label for additional precautions.
• 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 engine if left in tank.
Caution! When starting engine make sure the following is
observed. • Always turn off the car BEFORE turning off radio.
• Set engine Master needle to 3 turns (rich setting)
• Do not do this alone, get an experienced friend to help at • DAMAGE DUE CAR RUN AWAY IS NOTA WARRANTY
first. ISSUE.
• 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 IF YOU DO NOT BREAK-IN ENGINE
starts
• Turn on Radio and check the linkage before starting CORRECTLY, MAINLY AT LOW RPM,
engine.
• Turn on car receiver battery switch. YOU WILL BREAK THE CONNECTING
• Always have an air filter on the carburetor to keep dirt ROD!
out.
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
The car is very fast
and will too easily hit someone.

32237
Rebuild
Kit
2. Pull down piston, attach pressure top
and shock oil overflow with tissue
paper.
SHOCK ASSEMBLY
FILLING THE SHOCKS WITH OIL
ASSEMBLY OF THE SPRING
1. Pull down piston and pour oil into
shock cylinder. Remove air bubbles
by slowly moving piston up and down.
3. Tighten up shock cap.
*Move Slowly.
*Leave 3mm.
*Push onto shock
cylinder.
Shock Shaft
Piston
Silicone
Oil
Dust Pusher, Short
(Yellow Rubber)
Option:
32205
Dust & Shaft
Protector, long
Oil Seal
* Fit into groove.
2mm
Washer
1mm
Washer
7mm
E-Ring
* Note the E-Ring must
fit into groove as shown.
32051
6mm Ball End
32051
6mm Ball End
* Long shaft
for rear.
2.6mm Nut
* Push 6mm ball joint
into ball end.
2.6 x 5mm
Washer
Spring Collar
Spring Holder *Slide spring collar into Shock.
5mm
3mm
1mm
*Spring Tension adjust .er
(Standard)
30403
6mm
Ball Joint
Optional...
32330
Set, Red Springs, Front & Rear
32340
Set, Yellow Springs, Front & Rear
* Screw down cap.
32033
Pressure Top
32043
Cap, blue
*Fit into groove.
* Assembly 4 pieces of the
shock shaft .
32292
Front, 3.5mm
Short Shaft 30671
Front Shaft, 3.5mm
with Piston
30672
Rear Shaft, 3.5mm
with Piston
32236
Rear, 3.5mm
Long Shaft
32203
E-Ring
* Be careful not to damage shock shaft.
Screw
Cement
* Short shaft
for front.
down.
UP
( Make 2 for front.)
( Make 2 for rear. )
32051
Misc. Plastic Shock Parts
32051
Misc. Plastic Shock Parts

30121
3 x 5mm
Screw
(Small Head)
ASSEMBLY OF NEW “K” STYLE DIFFERENTIAL CASE AND GEARS
30751 Diff. Case ( Front/Rear )
30761 Diff. Case (Center )
30751 Diff. Case ( Front/Rear )
30761 Diff. Case (Center )
30779
P5 O-Ring
( Orange )
30779
P5 O-Ring
( Orange )
30779
0.5 x 26mm
O-Ring
30779
2 x 12.8mm
Pin
30779
2 x 12.8mm
Pin
30779
4 x 10mm
Washer
30779
4 x 10mm
Washer
30779
4 x 10mm
Washer
30769
Diff.
Bevel Gear
( Small )
30769
Diff.
Bevel Gear
( Small )
30769
Diff.
Bevel Gear
( Small )
30769
Diff. Bevel Gear
( Large )
30769
Diff.
Bevel Gear
( Large )
Grease
* Position the O-ring
as shown.
* Apply diff. Gear grease to the
differential, during assembly.
ASSEMBLYOF THE BEVEL GEAR
( Builds two differentials for front and rear. )
5 x 5mm
Set Screw
3 x 5mm
Screw
* Fill the diff. Case to
approx 70% with grease.
NB. It is very important to remove
the 30779 shim if the mesh
is too tight.
30773
4mm
Cross Pin
30773
4mm
Cross Pin
30771
Diff. Shaft
30771
Diff. Shaft
3x10mm
Tapping Screw
3x10mm
Tapping Screw
* Notice the straight holes
are for front and rear.
90026
5 x 5mm
Set Screw
90026
5 x 5mm
Set Screw
39730
Cap Joint
36730
Cap Joint 30620
7 x 19mm
Bal lbearings
30620
7 x 19mm
Ball bearings
Screw
Cement
Screw
Cement
31010
Optional - Bevel Gear
(Harden Steel)
30121
3mm
Tube
30121
3mm
Tube
30121
3 x 5mm
Screw
* Push 3mm tubes into
holes of the diff. Case.
30120
Bevel Gear
(Large/Metal)
31324 - FRONT OR REAR DIFF UNIT
31325 - CENTER DIFF UNIT

Screw
Cement
Screw
Cement
5 x 5mm
Set Screw
31040
30170
Brake Cap Joint
30170
Brake Cap Joint
30620
7x19x5mm
Ball Bearing
30620
7x19x5mm
Ball Bearing
90026
90026
30213
Brake Cam,
New
30211 30211
30171
Brake Lever Arm
Optinal:
30212
5x8x2.5mm
Flange Bearing

30201
Center Diff. Mount, new
30201
Center Diff. Mount, new
30180
Brake Pads
30180
Brake Pads
30180
Brake Pads
30180
Brake Pads
30190
Brake Disk
30190
Brake Disk
30652
Center Top Plate
(new)
30171
Brake Lever Arm

ASSEMBLY OF THE GEAR BOX
( Assemble two gear boxes for front and rear. )
5 x 5mm
Set Screw
30130
Bevel Gear
* Place set screw in D cut.
2
30630
6 x 13 x 5mm
Ball Bearing
* Insert two ball bearings
as shown.
36730
Cap Joint
Screw
Cement
1
30630
6 x 13 x 5mm
Ball Bearing
30010
Gear Box
3
* Make two gear boxes for front and
rear.
30010
Gear Box
Cover
30010
Gear Box
4 x 20mm
Flat Head
Tapping Screw
3 x 20mm Flat Head
Tapping Screw
30100
Front Shock Tower
4 x 10mm
Tapping Screw
ASSEMBLY OF THE FRONT SHOCK TOWER
4 x 10mm
Tapping Screw
Front Diff. Assembly
Note direction when installing!
30160
Front Arm Pin
Holder
Tower mounting
screws.

3 x 20mm
Flat Head
Tapping Screw
30160
Front Lower
Arm Holder
4 x 15mm
Tapping Screw
( Small Head )
0
1
0
1
Assembly of the right and left hand side
are the same.
Assembly of the right and left hand side
are the same.
36901
Ball Type
Knuckle Arm
( Right and Left )
R
* Use 5mm
hex wrench.
36903
13.8mm
Steering Ball
36905
Steering Ball
Washer
36904
14mm
Alum. Nut
* Adjust alum. Nut to
keep steering ball
smoot.
* Note the "R" mark
is for righthand side.
R
36053
8x16mm
Ball Bearing
36053
8x16mm
Ball Bearing 36052
CVA
Constsnt Velocity Axle
36870
4 x 10 mm
Set Screw
* A 4 x 10mm set screw is used
to adjust the ride height.
* Approx 3mm.
36870
4x4mm
Set Screw
36890
Front
Lower Arm
36900
Front
Upper Arm
3mm
3.5mm
R
36055
2.5 x 17mm
Pin
36054
Wheel Hub
( Alum. )
* Use 2.5mm
Hex Wrench.
ASSEMBLY OF THE FRONT ARM HOLDER
ASSEMBLY OF THE FRONT
PIVOT BALL KNUCKLE ARM
ASSEMBLY OF THE FRONT KNUCKLE ARM
INTO FRONT ARM
The gear box after assembled.
4 x 15mm
Tapping Screw
( Small Head )
4 x 10mm
Tapping Screw
( Small Head )
4x10mm
Tapping Screw

0
1
Assembly of the right and left hand side
are the same.
30151
Lower Arm Shaft
3mm
E-Ring
4 x 10mm
Tapping Screw
3mm
E-Ring
RR
* Insert drive shaft
before assembly.
4 x 10mm
Tapping Screw
3 mm E-Ring
5 x 5mm
Set Screw
* Do not over tighten
5x5mm set screw.
5x5mm
Set Screw
30152
Upper arm Shaft
3mm
E-Ring
90021
3mm
E-Ring
30102
Front Body
Post
3x8mm
Tapping Screw
0
1
RR
3 x 8mm
Tapping Screw
30701
3 x 3mm Set Screw
90021
3 mm E-Ring
3x25mm
Cap Screw 3mm
Flange Nut
0
1
36905
Caster Angle
Adjuster
* o change
the caster angle .
use adjuster t
Caster angle will
become bigger. Caster angle will become less.
ASSEMBLY OF THE FRONT ARM ONTO GEAR BOX
ASSEMBLY OF THE CASTER ADJUSTER

0 10 20 30 40 50
mm
* Adjust the upper rods length according
to the holes chose for attachment.
30330
Rear Tower
30340
Roll Bar Kit
30350
Rear Lower
Arm Holder & Cam
36082
Rear Wheel
Axle Shaft
36503
8x16mm
Ball Bearing
36503
8x16mm
Ball Bearing
31304
Rear Hub,
Pivot Type
31305
Ball Washer,
Plastic
31307
11mm
Pivot Ball, Screw
31306
12mm
Hex Nut
31303
Rear Lower Arm
30093
9mm Upper
Arm Ball End 30093
9mm Upper
Arm Ball End
36880
5x60mm
Turnbuckle 36880
5x60mm
Turnbuckle
36690
7mm Ball End 36690
7mm Ball End
36850
7mm Ball
36850
7mm Ball
30092
9mm
Ball with collar 30092
9mm
Ball with collar

1
Degree 1.5
Degree
Fig.1
* Set triangle marks in
the direction shown
in Fig.1.
Assembly of the right and left hand side
are the same.
0 10 20 30 40 50
mm
15mm
Screw
Cement
Screw
Cement
36054
Wheel Drive
Nut, 8mm axles
36055
Drive Pin
Multiple spacers are needed to
fit Kyosho and OFNA
cars using the same arms.
30351
30151, Long,
30320
30403
6mm Ball
30340
Roll Bar Parts Kit 30340

ASSEMBLY OF THE WING SUPPORT
3 x25mm
Flat Head
Tapping Screw
3 x25mm
Flat Head
Tapping Screw
3 x 20mm
Flat Head
Tapping screw
3 x 20mm
Flat Head
Tapping screw
30270
Wing Mount Kit
( Right )
30270
Wing Mount Kit
( Left )
30270
Wing Stay
30271
Wing Stay,
Replacements
30270
Plastic Post
3 x 25mm
Flat Head
Tapping Screw
3 x 20mm
Flat Head
Tapping Screw
(30270 Wing Supporter)
10290
3mm
Alum. Washer
10290
3mm
Alum. Washer
10290
3mm
Alum. Washer
30270
Rear Wing Support
30700 Misc. Screws
ASSEMBLY OF THE REAR WING MOUNT

ASSEMBLY OF THE SERVO SAVER
3 x 15mm
Screw
36742
Servo Saver
Bushing
36742
Servo Saver
Bushing
36750
Servo Saver
Connector
3mm
Nylon Lock Nut
3mm
Nylon Lock Nut
6 mm E-Ring
M3 Nylon Locknut
3 x 15mm Screw
30370
Servo Saver
Plastic parts
36743
6mm
E-Ring
36743
6mm
E-Ring
36743
6mm
E-Ring
36743
6mm
E-Ring
30370Servo Saver
Horn B
30370
Servo Saver
Horn B
30370
Servo Saver
Horn A
30370
Servo Saver
Top Adapter
36741
Servo Saver
Spring
36740
Servo Saver
Shaft
(Brass)
36740
Servo Saver
Shaft
(Brass)
30370
Plastic Tube
36741
8x12mm
Washer
ASSEMBLY OF THE FRONT PLATE AND
STEERING ROD
3 X 10mm
Screw
30540
Front Plate
30380
Servo Saver
Post
0 10 20 30 40 50
mm
* Made two steering rods for left and right-side.
30410
6mm Steering
Ball End
30410
6mm Steering
Ball End
30410
6mm
Ball & Socket
30410
6mm
Ball & Socket
30400
3 x 46mm
Turnbuckle
35mm
35mm
* Anticlockwise mark.
( Left-Side )
( Right-Side)

ASSEMBLY OF THE FRONT PLATE AND
STEERING ROD
3 x 15mm Flat Head
Screw
3 x 20mm Flat Head
Screw
3mm nylon
Lock Nut
3 x 15mm
Flat Head Screw
3 x 20mm
Flat Head Screw
3 x 20mm
Flat Head Screw
Front Steering Rod
( Right )
Front Steering Rod
( Left )
R
0
1
3mm
Nylon Lock Nut
3mm
Nylon Lock Nut
Knuckle Arm
( Left-Side )
3x10mm
Tapping Screw
3 x 10mm
Tapping Screw
ASSEMBLY OF THE FRONT PLATE
ONTO THE FRONT GEAR BOX

4 x 16mm
Flat Head
Tapping Screw
34040
Chassis, Ultra
No Kick-up
34040
Chassis, Ultra
No Kick-up
30240
34110
30700 Misc. Screws

34050
Center Drive
Shaft (Rear)
* Insert drive shaft into cap joint.
4 x 16mm
Flat Head
Tapping Screw
4 x 16mm
Flat Head
Tapping Screw
RR
3 x 25mm
Flat Head
Tapping Screw
( 2 Pcs )
4 x 16mm
Flat Head
Tapping Screw
3 x 25mm Flat Head
Tapping Screw
3 x 10mm
Flat Head Screw
( 3 Pcs)
34080
Nylon
Stone Guard
(Right-Side)
34080
Nylon
Stone Guard
(Left-Side)
ASSEMBLY OF THE GEAR BOX ONTO CHASSIS
ASSEMBLY OF THE STONE GUARD Assembly of the right and left hand side
are the same.

3 X 8mm
Washer
3mm Nylon
Locknut
3 x 5mm Screw
3 x 20mm
Cap Screw
* Place the clutch shoes
with the clutch springs
over the 3 pins of the
flywheel.
Using a screw driver as a lever,
bend the small end of the
clutch spring behind the
clutch nut and press
down to snap shoe in
place.
* Fit the flywheel using a cross
wrench or deep socket.
If engine turns when tightening,
hold piston with large thick tie-wraps
and hard wood in exhaust port.
Do not use metal, it will
damage engine.
#10098
SG Nut & Shim kit
Engines with ground shafts and few threads
are called SG Shaft. A special clutch nut is needed.
The stock flywheel (#10040) is fine.
ASSEMBLY OF THE CLUTCH INTO ENGINE
3 x 10mm
Tapping Screw
#10016
Air Filter
Sponge
Refills
#10017 - Blue
#10018 - Yellow
#10019 - Rose
#10031 - Filter Cover
Foam Air filters
#10021 - Black
#10027 - Yellow
#10028 - Pink
#10029 - Blue
Air Filter Connector Nylon Strap
( Small )
Nylon Strap
( Small )
You must oil foam filter before use.
Filter will not work if not oiled.
Clean with soap and water only.
You will damage foam if washed
if fuel!
ASSEMBLY OF THE AIR FILTER
#10100
Clutch Spring
#10010
Clutch Shoes
Black Type
* Shoes are
trailing.
3 x 8mm
Washer
Misc. Hardware
#10099
#34110
5x10x4mm
Ball Bearing
#34110
5x10x4mm
Ball Bearing
#10040 (stock)
3 Pin
Flywheel, Taper
#10041
3 Pin
Flywheel, Hole
#10091
Clutch Nut
screw type
3 x 5mm
Screw
#10330
Brass, Corn (big hole)
#10329
Brass, Corn (sml hole)
3mm
Nylon Lock
Nut
3mm
Nylon Lock
Nut
3 x 20mm
Hex Screw
3 x 20mm
Hex Screw
#30480
Engine Mount
#10398 - 12T
#10399 - 13T
#10400 - 14T (stock)
#10401 - 15T
#10402 - 16T
#10403 - 17T
#10404 - 18T
Clutch Bells
SEE NOTES ABOVE
Notes:
Non-Pull Start Engines...
• Alum. Washer behind the flywheel is not needed when using Force engines or similar types. O.S. Engines will
require washer spacer.
• To check!..place the brass corn #10330 (big hole) against the engine bearing, then flywheel. You should be
covering one or two thread of the engine shaft. If this is the case, you do not need an additional washer behind the
flywheel.
You must cut the engine shaft if too long. Count 6 threads in front of the flywheel and mark. This is all you need to
tighten the clutch nut and mount the flywheel.
Force Pull Start Engine...
• Force Pull Start Engines required NO additional spacer and no shaft cutting. The Force engines comes with an
alum. cast driver washer, you use this part as the spacer, not the alum. washer shown for O.S. installs
But, you must find the #10329 brass corn (sml hole) for Flywheel. This special corn fits the smaller thread
diameter of the engine shaft. It will center the flywheel when tightening the clutch nut.

INSTALLATION OF THE FUEL TANK
AND ENGINE ONTO CHASSIS Note Book Paper
*Use note book paper to set
gear backlash between spur gear
and clutch bell gear.
If the space is not correct the spur gear
will be damaged.
3 X 20mm
Cap Screw
Spur Gear
Clutch Bell
* Loose or tighten 3x20mm cap screw
and 5x10mm hex screw to align
spur gear and clutch bell gear to 90
degree.
10111
5x12mm
Washer
( 4 pcs )
5x10mm
Hex Screw
( 4 pcs )
3 x 10mm
Tapping Screw
3 x 10mm
Tapping Screw
30288
Plastic Post
30288
Plastic Post
3 x 15mm
Screw
3 x 15mm
Screw
Pressure Nipple
Fuel Nipple
*Tighten the strap
and cut off the excess.
10180
Silicone Tube
10068
Manifold Adapter
( Red Silicone )
10120
Manifold
Spring
5x5mm
Set Screw
4x1omm
Flat Head
Screw
30491
Muffler Wire
4mm
Nylon
Lock Nut
ASSEMBLY OF THE MANIFOLD AND
MUFFLER
Nylon Strap
( middle )
10060
Manifold
10079
Pressure Nipple
30490
Muffler
* Drill a hole (Size 3.5mm)
in the place and align as shown.
Use a two part epoxy glue to
full seal the nipple base to the
nipple.
30280
Fuel Tank
90 degree
* Read this page with very carefully.

ASSEMBLY OF THE FUEL TUBE
* Connect to
fuel nipple.
* Connect to
carburetor.
* Connect to fuel tank
pressure nipple.
ASSEMBLY OF THE RADIO TRAY AND SERVO
* Connect to
press nipple.
3 x 10mm
Tapping Screw
ASSEMBLY OF THE BRAKE SYSTEM
3X3mm
Set Screw
A-80B
2mm
Adjust Nut
Servo Mount 2x25mm
Screw
( Use #30800 brake system plastic parts set. )
Adjust
Mount
3mm
Nut
Slider
3x12mm
Screw
2x8mm
Screw
2mm Nut 2mm
Tie-Rod End
2mm
Tie-Rod End
2x6mm
Washer
2x6mm
Washer
2x4mm
Screw
2x4mm
Screw
Screw
Cement
Servo Horn
3 x 10mm
Tapping Screw
3 x 10mm
Tapping Screw
30520
Radio Tray
Post, Aluminum
34031
Radio Tray
Post, Nylon
Radio Tray
Post
3 x 10 mm
Flat Head
Screw
3406
Radio Tray
Fuel Tube