FIALA MOTORS Valach Motors VM R5-250 User manual

Manual for motor FM_VM R5_R7 ( Date of publication 01/2018)
FIALA PROP s.r.o, Vysoká 56, 75641 LEŠNÁ , Czech Republic , e-mail: [email protected]
www.fialaprop.com Page 1
250 R5 420 R5 800 R7
Volume: 250 ccm Volume: 420 ccm Volume: 800 ccm
Bore: 42 mm Bore: 47 mm Bore: 52 mm
Stroke: 32 mm Stroke: 48,5 mm Stroke: 52 mm
Weight: 5,6 kg Weight: 11,8 kg Weight: 28,2 kg
Manual for radial motors VM R5-250, R5-420, R7-800 produced by
Fiala Prop, s.r.o. company
Safety instructions.
It is imperative that you read before handling and using the motor this notice and study
the motor manual. If you not find answers to your questions, consult with a more
experienced colleague, contact your dealer engine or contact the manufacturer directly.
Remember that engine, what you bought is not a toy and is designed only to drive the
airplane models under the terms of the instructions for assembly and use. In the case of
our products, it is a big volume motors and performance, thus this requirement is more
important.

Manual for motor FM_VM R5_R7 ( Date of publication 01/2018)
FIALA PROP s.r.o, Vysoká 56, 75641 LEŠNÁ , Czech Republic , e-mail: [email protected]
www.fialaprop.com Page 2
If the motor or the whole model with this motor provide another person, tell him safety
instructions and operating instructions. If you do these guidelines and / or instructions lost
or destroyed, you can re-download them from our website.
Please take great care in securing the motor in model and check it regularly. Likewise,
check the propeler mounting screw.
It is not allowed to move when the engine is running in the plane of rotation of the
propeller and in front of it (in the case of classical, towing arrangement - CW). Attention to
touch the spinning propeller! When you start your model and warming up the motor well
secured against rolling away, preferably with qualified persons.
Do not allowed to play near the running motor small children and bad moving people also
make sure pets.
Before every start, pay attention to the condition of the propeller. Damaged, chipped or
unbalanced propeller can dismantle the entire model, motor pull from model, no matter
how well done by you and even fatally injure persons standing nearby. Do not attempt to
repair a damaged propeller, it is very dangerous and it always prefer to immediately
replace for the same type and parameters. Use a good quality propeller manufacturers,
designed for petrol motors. We recommend using propellers Fiala, which is developed and
produced by ourselves.
Do not start the engine in an enclosed space, but only in open spaces.
After stoping the motor, keep in mind that the whole motor including muffler is very hot
and can cause burns. Therefore let the motor before checking or servicing to cool down
completely.
Follow the rules of fire safety, smoke, etc., model and motor is full of petrol. Likewise,
please protect your eyes and mucous membranes before the petrol.
Please follow the general rules for your own safety and also for bystanders and use your
own common sense according to the principle - what could theoretically happen, will also
one day become.
Note .: Our advice to the conclusion - many modelers have for complex, large and
expensive models prepared their own list of performing pre and control operations, so-
called - Check List. It can still be advantageously incorporate a list of specific control
operations on the motor and drive unit as a whole.

Manual for motor FM_VM R5_R7 ( Date of publication 01/2018)
FIALA PROP s.r.o, Vysoká 56, 75641 LEŠNÁ , Czech Republic , e-mail: [email protected]
www.fialaprop.com Page 3
1. Motor aplication
Motors VM R5-250, VM R5-420 a VM R7-800 are 4-stroke gasoline motor with volume 250, 420 and
800 ccm and are designed for use in model aircraft. They are not designed or recommended for any
other use.
2. Description of the motor
They are a 4-stroke motor with OHV and 2 valves per cylinder. Microprocessor ignition for easy
starting and smooth running in all modes of engine speed. Dimensions and more information you can
also see on our web www.fialaprop.com
On FB Fiala Prop and You Tube channel Fiala Prop you can see many informations including video
manual how to start 4-stroke motors VM / FM, which is different from similiar 2-stroke motor
starting.
The Common instructions for the FM / VM 4-stroke engines, Attachement to manuals for radial 5-
cyl. and 7-cyl. petrol engines FM / VM, PowerFuel RX electric fuel pump Fiala is also annexed to
this manual.
3. Fuel
Use unleaded gasoline with a minimum octane 95 mixed with synthetic oil designed for two-stroke
engines.
For running we recommend 1:25, after running 1:30. Run-in should take about 2 hours of operation.
We recommend Valvoline oil - SynPower 2T - Full Synthetic, Mobil 1 - Racing 2T - Full Synthetic or
Repsol - Moto2T Racing. If you are not sure about the suitability of oil, which is going to use, contact
authorized service center or the manufacturer directly.
4. Propeller
For these motors we recomended following Fiala propellers:
VM R5 - 250 –2-blade : 32/20; 34/16; 34/18
3-blade: 30/18
VM R5 –420 –2-blade: 38/24; 40/20; 42/20
3-blade: 38/20; 40/20
VM R7 –800 –2-blade: 48/22 –59/20
3-blade: 45/24 - 50/20
Best results you get with Fiala propellers.

Manual for motor FM_VM R5_R7 ( Date of publication 01/2018)
FIALA PROP s.r.o, Vysoká 56, 75641 LEŠNÁ , Czech Republic , e-mail: [email protected]
www.fialaprop.com Page 4
With these propellers motor should be measured on the ground to achieve optimum speed, for :
VM R5 –250 approx. 3900 - 4400 RPM
VM R5 - 420 approx. 3700 - 4200 RPM
VM R5 - 800 approx. 2800 - 3200 RPM
When installing and using the propeller observe strictly all safety recommendations propeller
manufacturer. Propeller is mounted on motor by a central bolt M10x 1 and six screws around the
perimeter of the flange.
5. First start of the motor
Properly attach the motor to the model or the test stand using all four screws. We don´t recomended
long running on stand due to vibrations, which is another than in case of mounting in the fuselage. If
you use testing stand, do not screw the engine hard, for example on a steel weldment, but always
use at least a wooden board, etc., but not the silentblocks! Connect the ignition source (4.8 - 9V, min.
capacity of 1500 mAh). Connect the fuel tank.
Make sure that the ignition is switched off
-close the choke
-5-6 x crank the motor in order to suck fuel
-open the choke
-adjust slightly increased idle speed cca 10%
-turn on the ignition
-start the motor
If after about 5 attempts, the engine does not start, repeat the procedure again
Note : ignition is equipped with a security protection function, because if it is turned on and the
motor is more than a minute at rest, the ignition is switched off. In this case, it is only the ignition off
and on again. For more information see the instructions of electronic ignition.
6. Starting the motor
Cold motor
Make sure that the ignition is switched off
-close the choke
-3-4 times to spin the engine, in order to draw fuel
-open the choke and set the full throttle
-1 x spin the motor

Manual for motor FM_VM R5_R7 ( Date of publication 01/2018)
FIALA PROP s.r.o, Vysoká 56, 75641 LEŠNÁ , Czech Republic , e-mail: [email protected]
www.fialaprop.com Page 5
-set a slightly increased idle speed of about 3-8% (must be tested on a specific motor)
-turn the ignition
-start the motor
Warm motor - up to 4 minutes of engine styling
-turn the ignition
-set a slightly increased idle speed of about 3-8% (must be tested on a specific motor)
-start the motor
Warm motor - five minutes after the engine stalling
Make sure that the ignition is switched off
-close the choke
-1 x spin the motor
-open the choke
-set a slightly increased idle speed of about 3-8% (must be tested on a specific motor)
-turn the ignition
-start the motor
If a situation arises that the engine will not start, there was either a glut motor fuel, or vice versa
engine is lean.
Because these conditions can be difficult to detect, we recommend the following procedure:
-check the fuel system (leaks, throughput, level of fuel etc.).
-make sure that the ignition is switched off
-set full throttle
-10 x spin the motor
-turn the ignition
-set a slightly increased idle speed of about 3-8% (must be tested on a specific motor)
-start the motor
If the engine can no longer run, we recommend:
Make sure that the ignition is switched off
-close the choke
-3-4 times to spin the motor, in order to draw fuel
-open the choke and set the throttle
-1 x spin the motor
-set a slightly increased idle speed of about 3-8% (must be tested on a specific motor)
-turn the ignition
-start the motor

Manual for motor FM_VM R5_R7 ( Date of publication 01/2018)
FIALA PROP s.r.o, Vysoká 56, 75641 LEŠNÁ , Czech Republic , e-mail: [email protected]
www.fialaprop.com Page 6
If the engine still does not start, it is necessary to contact an authorized service center or the
manufacturer directly.
7. Running motor
Each motor is factory-tested and adjusted to the basic setting. Use a fuel with a higher ratio of oil
(see section 3 of this manual), ie. 1:25. While running is not recommended long term exceed the
motor speed 2500 / min while controlling the temperature of the engine. Do not keep a constant
speed but motor flush with the occasional addition / slow down the gas. This mode observe about
the first 30 minutes of operation. After a short time, you can gradually increase the speed up to
higher allowed RPM . Total time of run is about 2 hours.
8. Install the motor inside the model
When thinking about the placement of the engine into the model, keep in mind that it is absolutely
necessary to ensure proper cooling. Use all screws to attach the motor to the motor mount. Engine
mount directly without dampers. Use self-locking nuts and / or thread adhesive of medium strength.
9. Transport status of motor
The 250 R5 is delivered due to transport and the risk of damage with the dismantled carburettor.
Preparation of the carburettor for assembly, step 1 to 3.

Manual for motor FM_VM R5_R7 ( Date of publication 01/2018)
FIALA PROP s.r.o, Vysoká 56, 75641 LEŠNÁ , Czech Republic , e-mail: [email protected]
www.fialaprop.com Page 7
Position of the carburetor on the engine, Figures 1 and 2.
Alternative possible position of the carburetor (180 Degrees), Figures 1 and 2.
10. Motor maitenance
The engine is designed and constructed to require minimal maintenance. The valve clearance is
checked every 3 hours of engine operation and the valves are lubricated at the same time. Under this
maintenance, the status of the battery for the ignition is checked. Check spark plugs as needed, we
recommend it after approx. 10 hours of operation. Spark plug for the VM 250 R5 is NGK CM 6, for the
VM 420 R5 is NGK CM 6 and the VM R7-800 is used with the DENSO W 14MPR-U10, the M14x1,25
thread (electrode distance 0.4mm) or the Bosch CM-6RO 088 , thread M14x1,25 (electrode distance
0,4mm) or NGK BPMR7A, thread M14x1,25.
The numbering / order of cylinders is from cylinder 1 (upper) to the left - CCW- No.2, 3,4,5 (6,7).
Please use high quality tools for adjusting and maintaining the engine, and do not use "ball" types for
allen wrenches.
Please take extra care when tightening / loosening the M3 screws on the 250 R5 valve cover !
10.1. Adjusting valve clearances –only on cold motor!

Manual for motor FM_VM R5_R7 ( Date of publication 01/2018)
FIALA PROP s.r.o, Vysoká 56, 75641 LEŠNÁ , Czech Republic , e-mail: [email protected]
www.fialaprop.com Page 8
The correct valve clearance is cold engine 0.1 mm. Is set with the gauge and tools attached.
Adjustment procedure: Loosen the nut, place the gauge between the rod and the rocker arm and
adjust gradually screwing the clearance so that the gauge was sliding grip. Then tighten the nut
again. After tightening, check the valve clearance again. The following pictures will tell you more. We
set the cylinder in front of and behind the cutting machine.
10.2. Lubrication rockers
Always when checking / adjusting valve lash perform simultaneously lubricate the rocker. We
recommend oil Motul Chain lube Off road or similar quality oil for lubrication of motorcycle chains
with temperature determining to 150 ° C. How and where to apply grease is seen in the photograph.
At the same time, or at least from time to time it is necessary to check the cleanliness of the motor,
status / battery condition for ignition and the gap between the spark plug electrodes. This should be
set to 0.4 mm. When the electrodes are burnt, replace the spark plug.

Manual for motor FM_VM R5_R7 ( Date of publication 01/2018)
FIALA PROP s.r.o, Vysoká 56, 75641 LEŠNÁ , Czech Republic , e-mail: [email protected]
www.fialaprop.com Page 9
11. Carburetor
The engine is supplied with a Fiala electric fuel pump. The instruction is included, please follow the
installation instructions. As a standard, Walbro carburetors are fitted to the engines. These
carburettors are equipped with two adjusting rotating needles marked H (high) and L (low). The H-
needle is used to adjust the carburettor / engine at the highest speed, and the L-needle, on the other
hand, affects low speeds and transitions up to medium speeds. The basic setting of the two needles
is 2 revolutions, calculated from the tightened needle. Fine tuning and tuning of the engine should
only be done after mounting into the model.
12. List of common spare parts and accessories
Find the www.fialaprop.com, or to inform on e-mail: [e-mail]
13. Motor repair
If, during the warranty period there is a problem or failure, please contact your dealer, who will help
you solve the problem, or contact the manufacturer.
We wish you a lot of satisfaction with our product!
FIALA PROP s.r.o
Vysoká 56
75641 LEŠNÁ
Czech Republic
e-mail: [e-mail]
www.fialaprop.com