Instruction manual to use the engi
ne VM 120i2-4T
VM 120
i2
-4T
1. Use of the engine
The engine VM 120
i
2
– 4T is a four-stroke spark-ignition petrol engine of the
volume of cylinder equal to 120 cm
3
and is designed exclusively to propel model
airplanes. Any other use is not permitted.
2. Description of the engine
It is a four-stroke boxer engine with valve-operating mechanism OHV and 2 valves in
one cylinder. Processor-controlled combustion enables calm operation of the engine
within the whole range of use and comfortable start.
3. Fuel used
We prescribe the use of unleaded gasoline of octane rating 95 mixed with a fully
synthetic two-stroke oil in a ratio of 1:25 for running-in (the first two hours of use) and
1:30 for normal operation.
We recommend to use the oil - brand
Valvoline - SynPower 2T - Full Synthetic
.
(Europe)
or
Mobil 1
– Racing 2T – Fully Synthetic – 2 Stroke Engine Oil or
Repsol
– Moto 2T Racing.
We do not recommend to use the oil
– brand Castrol due
to high number of carbon.
4. Recommended propellers
We recommend to use the following propellers:
The engine reaches optimum number of revolutions - approximately 5,000
revolutions/minute with these propellers.
While using propellers, safety has to be observed and all recommendations of
manufacturers have to be adhered to. The propeller has to be fastened with one
central bolt M10x1 and with six auxiliary bolts M5 which are included in the delivery.
5. Engine running-in
The engine has been tested and preliminarily adjusted in the manufacturing plant.
The fuel mixture 1:25 described in the section 3 has to be used for engine running-in.
We recommend not to exceed 3,000 revolutions / minute on long-term basis for the
running-in period and engine temperature has to be checked at the same time. This
mode of operation has to be kept for at least 30 minutes. After this period of time,
number of revolutions / minute may be increased to 5,000 for a short time.
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