Ofna Racing 9.5 RTR, ultra mbx r2 plus Instruction Manual
OFNA Racing
22692 Granite Way, Ste. B
Laguna Hills, Ca. 92653
(949) 586-2910
Www.ofna.com
RTR Instruction
Manual
PURE COMPETITION...........
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!
3 x 5mm Screw
3 X 8mm
Washer
3 x 20mm
Cap Screw
3mm Nylon
Locknut
#10398 - 12T
#10399 - 13T
#10400 - 14T (stock)
#10401 - 15T
#10402 - 16T
#10403 - 17T
#10404 - 18T
Clutch Bells
#34110
5x10x4mm
Ball Bearing
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.
#10010
#10100
Clutch Spring
#34110
5x10x4mm
Ball Bearing
Clutch Shoes
Black Type
ASSEMBLY OF THE CLUTCH INTO ENGINE
#10330
Brass, Corn (big hole)
#10329
Brass, Corn (sml hole)
SEE NOTES ABOVE
3 x 20mm
Hex Screw
3 x 20mm
Hex Screw
3mm
Nylon Lock
Nut
3 x 8mm
Washer
3 x 5mm
Screw
Misc. Hardware
#10099
* 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.
* 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.
ASSEMBLY OF THE MANIFOLD AND
MUFFLER
#10091
Clutch Nut
screw type
* Shoes are
trailing.
#10040 (stock)
3 Pin
Flywheel, Taper
#10041
3 Pin
Flywheel, Hole
#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.
#10069
Manifold Adapter
( Red Silicone )
#30480
Engine Mount
#31991
Manifold, Polished
3mm
Nylon Lock
Nut
#10079
Alum. CNC
Pressure Nipple
* Drill a hole (Size 3.5mm)
in the place and align as shown.
Use a two part high temp. epoxy glue to
#31992
Dual Chamber, Polished
fully seal the nipple base.
#10120
Manifold
Spring
*Tighten the strap
and cut off the excess.
#10184
Blue, Silicone Tube
Nylon Strap
( Large )
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