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Video Two stroke engine 1
Video Two stroke engine 2
Video Two stroke engine 3
Video Two stroke engine 4

Video Two-stroke for chainsaw
Video Cyl. loop scavenging

Video Trabant engine
Video DKW F1 from 1930

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  Two-stroke engine for a chainsaw

Two-stroke chainsaw engine
EngineSingle cylinder
Displacement76,5 cm³
Bore * stroke52 * 36 mm
Mixture preparationMembrane carburetor
Lubrication1 : 50
Performance4,4 kW (6 HP)
Idling RPM2.500 rpm
Maximum RPM13.500 rpm
Oil tank0,325 liters
Tank capacity0,8 liters
Weight6,5 kg

This is really a little, lightweight power-house. In the past, saws like this had to be guided and held by two men. You can find your way around this machine pretty quickly, if you have a look at the centrally placed engine, surrounded by the air filter on the upper right hand side, the exhaust on the upper left, the fuel tank at the bottom right and the oil tank at the bottom left.

Let's start with the air-filter, which in this case, because of the cut-away view, lacks it's contents, e.g., a foam-rubber mat. Directly behind it, is the hardly visible choke-flap, which can be closed from the outside by moving the opening- and closing lever (at the bottom). This reduces the air-intake and increases the amount of fuel taken in by more effective vacuum.

The membrane carburetor, which we'll now discuss, can supply the engine with a certain amount of fuel-air mixture, regardless of the engine's position. Thereby, the membrane, which can be seen below the throttle-flap, is moved alternatively by pressure and by vacuum, thus functioning almost like a fuel pump.

The fuel-line can be easily recognised by it's corrugated rubber casing, the suction opening right at the bottom in the fuel tank, can also be seen. This means, that this particular chain saw will not function when turned upside down. The following path of the inlet port leads to an opening in the cylinder where the piston opens the way to the crankcase.

The upper opening of the overflow port can only just be seen directly above the piston. A second port, on the opposite side can't be seen because of the cut-away. On the left then, is the exhaust port, which leads to a rather large silencer. There are by the way, also chain saws which have a catalytic converter here.

We can deal with the rest quite quickly. The drive for the chain is on the rear side of the crankshaft, on the front side is the start mechanism. The starting occurs either by pulling on the pull-rope or a spring is wound up and after pressing a release button, it's torque turns the engine over. 11/13               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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