21CLEANING OF FUEL FILTERWARNING: INFLAMMABLES STRICTLY PROHIBITEDInterval of cleaning and inspection: Monthly (every 50 operating hours)Suction head in the fuel tankCheck the fuel filter (A) periodically. To check the fuel filter, follow the stepsbelow:(1) Remove the fuel tank cap, drain the fuel to empty the tank. Check the tankinside for any foreign materials. If any, remove them.(2) Pull out the suction head by using a wire hook through the tank opening.(3) If the fuel filter clogged slightly, clean it. To clean it, gently shake and tapit in fuel. To avoid damage, do not squeeze or rub it. The fuel used for thecleaning must be disposed in accordance with the method specified byregulations in your country.If the fuel filter became hard or heavily clogged up, replace it.(4) After checking, cleaning or replacing, insert the fuel filter into the fuel pipe(B) and fix it by the hose clamp (C). Push the fuel filter in all the way to thebottom of the fuel tank.Clogged or damaged fuel filter can cause insufficient fuel supply and reduceengine power. Replace the fuel filter at least quarterly to ensure satisfactory fuelsupply to the carburetor.CLEANING OF PARTSKeep 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.BCAAREPLACEMENT 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 (A) every year, regardless of operating frequency. Fuelleakage may lead to fire.If any leakage is detected during inspection, replace the fuel pipe immediately.INSPECTION OF BOLTS, NUTS AND SCREWSRetighten loose bolts, nuts, etc.-Check for fuel and oil leakage.-Replace damaged parts with new ones for safety operation.-INSPECTING SPROCKETCheck the sprocket for wear every 50 hours of use. Replace it if the wear marksbecomes 0.3 mm or deeper.0.3 mm