Operating instructions - petrol engine • Ord.No. 1023 / Ord.No. 1030
02/06
If you are one of those specialists who never read instructions, please note these two important points at
the outset:
1. Don’t over-tighten the fan screw 90200!
2. Before starting the engine for the first time, unscrew the sparkplug and inject about 1 cc of two-stroke
oil directly into the combustion chamber.
Fuel
The recommended fuel is a normal two-stroke mixture consisting of standard unleaded petrol mixed with a good
fully synthetic high-performance two-stroke oil at a ratio of 1:40. For helicopter use we recommend VARIO two-
stroke oil, Ord.No. 1022/2 or 1022/4. Add the oil to standard petrol and invert the container repeatedly to mix the
components. Be sure to use only special petrol-proof hoses.
Great care must be exercised at all times when handling petrol.
Use strong, absolutely leakproof fuel containers exclusively, and
don’t smoke
!
Carburettor adjustment
Remove the throttle flap stop-screw and spring, to allow the carburettor to close fully. The carburettor is factory-
adjusted, and the engine will start with the default setting.
To adjust the engine and helicopter to obtain the correct system rotational speed and the optimum carburettor
setting, work gradually towards the correct settings, always moving „from below“ in small increments, i.e. engine
rich, flat throttle curve with 50% maximum value (carburettor half-open). There is good sense behind this
procedure: petrol engines feature „forced ignition“, and will continue to run even when leaned out severely. Under
these conditions they become very hot, and the result is: engine damage! For this reason it is always best to start
by setting the engine „rich“, so that it hardly produces any power. From this point work gradually towards the
setting which gives smooth, powerful running by adjusting the full-throttle needle in increments of 1/8 turn. Once
this is established, don’t lean the mixture out further - not even experimentally. The full-throttle needle is marked
„H“ (high) and the idle needle „L“ (low). Screwing the screw in gives a leaner setting, unscrewing it gives a richer
setting.
Starting the engine
To start the engine first press the pump bell repeatedly to force fuel out of the tank to the carburettor, until excess
fuel runs out of the overflow.
Always remember: throttle flap at idle! Close the carburettor opening with your finger or the choke, and pull the pull-
cord starter 1 or 2 times. This sucks in adequate fuel. The engine can now be started by pulling the pull-cord
starter.
Running-in ...
... is not necessary. Far more important is to select a slightly rich setting at all times. For the first few hours run the
engine on a slightly more oil-rich fuel mixture than normal: 1:25 instead of 1:40.
Sparkplug
Please use only original resistance sparkplugs, Ord.No. 1022/3.
Ignition-induced radio interference
For helicopter use you should always use the special suppressed sparkplug cap, Ord.No. 4321, and carry out a
range check before the first flight. Check first with the engine stopped, then with it running. The difference in range
compared with the engine stopped should be insignificant.
Petrol engine accessories
Petrol-proof and methanol-proof quick-fill station
A ball valve system is used in the manual pump, i.e. the pump does not pressurise the container in the usual way.
Just ten turns of the manual pump are enough to fill a 500 cc fueltank. The gravity-controlled valves allow you to
drain the tank simply by turning the manual pump through 180°. Even quite small quantities can be pumped
accurately. The container is very strong and has a capacity of 3 litres. Ord.No. 3720.
Fuel tubing
, 4 mm Ø, Ord.No. 830/83
Sparkplug
, Ord.No. 1022/3
Clunk felt filter for tank installation
, Ord.No. 26/30
Exhaust gasket, heat-resistant
, Ord.No. 115/29
Geared pump
, Ord.No. 3721
Copper exhaust gasket
, Ord.No. 115/30
Fine-mesh filter
, Ord.No. 830/68
3-part combi-gasket, copper core
, Ord.No. 115/74
Petrol mechanics fueltank
, 540 ml, Ord.No. 830/26
Carburettor intake trumpet
, Ord.No. 1022/13
Synthetic two-stroke oil
, 1 l, Ord.No. 1022/2
Suppressed plug cap
, Ord.No. 4321
Zenoah-oil,
1 l, Ord.No. 1022/4
VARIO Helicopter Uli Streich GmbH & Co. KG • Geschäftsführer Kirsten Zodtner
Seewiesenstr. 7 • 97782 Gräfendorf •
0 93 57.97 10-0 • Fax 0 93 57. 97 10 10
