ADJUSTMENT AND MAINTENANCE OF THE JIKOV ENGINE
1. PREPARATION
a) Fuel: Use only automobile petrols of which the best is currently available Czech petrol grade SPECIAL 91. Two-
stroke engine are lubricated with a fuel mixture consisting of petrol blended with oil at a recommended ratio.
For lubrication of this two-stroke engine the manufacturer recommends a mixture of petrol and oil. Use oil "MOGUL
TS " or “MOGUL TSF” designed for heavy-duty engines, with excellent lubricating properties, at the use of which a
well-set engine exhibits lower values of emissions and smoke density. Blending ratio of the mixture (petrol : oil) is 50 :
1. For the time of running in the engine (ca. 10 hours) it is advisable to reduce the ratio to 33 : 1 .
The mentioned oils are currently available in the network of petrol stations.
Adhere to safety regulations when refuelling. Do not refuel the machine in enclosed spaces, do not smoke and do
not do refuelling in a vicinity of open fire.
Fuel tank should be filled only up to 2.5 cm below the upper edge of the tank neck. Fuel tank volume is 3 litres.
b) Air cleaner: For the correct functioning of the oil air cleaner the body of the air cleaner must be filled with engine
oil. Remove the lower part of oil air cleaner by releasing the tightening sleeve and fill it with engine oil which is
normally used for petrol/oil mixture.
Oil surface is to be max. 0.5 cm above the bottom of the lower part of the oil air cleaner.
It is advisable to make regular checks of oil for its contamination in the lower part of the cleaner. If so, replace it with
new oil without delay.
In the dry season (summer months and at cutting), check the air cleaner every day, otherwise once a week. Practical
results from the machine use indicate that oil must be exchanged after about 30 hours of operation.
Air cleaner should be checked with the engine switched off !
Air cleaner insert wash out in technical petrol –when dirty- and before mounting it back, let it dry properly. The check
is to be made along with the check of oil volume in the oil air cleaner.
2. STARTING THE ENGINE
Start the engine only when it is coupled to a gearbox or another aggregate of the VARI-System!
Do not start the engine in enclosed rooms. Gases generated at fuel combustion are dangerous to life!
When starting the engine, shift the gear to neutral or disengage the travel clutch. Be very careful in aggregates
without a possibility of disconnecting the drive from the machine since the machine may get into motion at
increased starting rotations.
Start is to be made so that you will stand behind the machine in the direction of the starting cord, holding the
handlebars and controlling the accelerator lever with your left hand and making start with your right hand by using
the grip on the starter cord. Engine rotations should be reduced immediately after the start. Safety ignition switch
is in Position 1 at starting.
a) Cold motor:
Open the fuel cock, shut the starting throttle (lever must point upwards) and set the accelerator lever to about a 1/3 of
lever step. Put the starter gearing into engagement by slightly pulling the handle out and start the engine by a rapid pull
on the handle of the self-returning starter. Right after start, open the starting throttle (lever in horizontal position), but
do not load the engine with high rotations.
If the engine does not start at a second try, the starting throttle must be opened, accelerator lever set to full opening and
the start should be repeated.
b) Warmed-up engine:
Open the fuel cock. Set the accelerator lever to about a 1/2 of lever step and start the engine.
It is recommended that the fuel cock on the carburetter is closed even at a shorter break in machine operation.
3. OPERATION
After having been started, the engine can be fully loaded after about a minute. Speed limit governor on the rear face of
the tank serves to set engine rotations according to the used machines or implements or works to be carried out (see
instructions for use of respective implements and machines of the VARI-System).
4. STOPPING THE ENGINE
If you wish to stop the machine, shift the accelerator lever into Position "MIN", the centrifugal clutch will be
disconnected and the machine will come to a stop.
If you wish to switch off the engine, release the lever of safety ignition switch on the left handlebar and the engine will
switch off. This switch will provide for engine switch-off and machine stop in critical situations with danger of collision
or injury to operator.
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General