The main element of the fuel system is the carburetor or injection system, which are tested and adjusted at the factory for a specific engine and fuel grade. Increased fuel consumption and reduced engine power are usually not a defect in the fuel system, but have other causes, among which driving style and driving conditions play a particularly important role. Therefore, in carburetors, it is only necessary to carefully adjust the idle system. Correct adjustment of the idle system has a significant effect on engine operation in transient modes up to medium engine speeds.
Fuel
The vehicle must be filled with the appropriate petrol only. When filling the vehicle with unleaded fuel, the valve seats must be made of hardened material and the initial ignition advance angle must be shifted to a later ignition position. All vehicles manufactured since February 1986 (except LPA engines) can be operated on unleaded fuel.
Engines with a displacement of 1.3 dm³/ 69 hp and 1.6 dm³/ 79 and 105 hp can be operated on unleaded fuel since September 1984. However, when using unleaded fuel, every 4th refill must be made with leaded fuel, and for the OHV engine, a precise valve clearance value is required.
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