22CLEANING OF FUEL FILTERWARNING: INFLAMMABLES STRICTLY PROHIBITEDInterval of Cleaning and Inspection: Monthly (every 50 operating hours)Suction head in the fuel tank– The fuel filter (1) of the suction head is used to filler the fuel required by thecarburetor.– A periodical visual inspection of the fuel filter is to be conducted. For thatpurpose open the tank cap, use a wire hook and pull out the suction headthrough the tank opening. Filters found to have hardened, been polluted orclogged up are to be replaced.– Insufficient fuel supply can result in the admissible maximum speed beingexceeded. It is therefore important to replace the fuel filter at least quarterly toensure satisfactory fuel supply to the carburetor.Fuel pipeHouse clampFuel filter (1)Fuel pipeINSPECTION OF BOLTS, NUTS AND SCREWS– Retighten loose bolts, nuts, etc.– Check for fuel and oil leakage.– Replace damaged parts with new ones for safety operation.CLEANING OF PARTS– Keep the engine always clean.– Keep the cylinder fins free of dust or dirt. Dust or dirt adhering to the fins will cause piston seizure.REPLACEMENT OF GASKETS AND PACKINGSIn reassembling after the engine is dismounted, be sure to replace the gaskets and packings with new ones.Any maintenance of adjustment work that is not included and described in this manual is only to be performed by Authorized Service Agents.REPLACEMENT OF FUEL PIPECAUTION: INFLAMMABLES STRICTLY PROHIBITEDInterval of Cleaning and Inspection: Daily (every 10 operating hours)Replacement: Annually (every 200 operating hours)Replace the fuel pipe every year, regardless of operating frequency. Fuelleakage may lead to fire.If any leakage is detected during inspection, replace the oil pipe immediately.