30Trouble shootingMalfunction System Observation CauseChain does not run Chain brake Engine runs Chain brake actuated.Engine does not start or Ignition system Ignition spark Malfunction in fuel supply system, com-only with difficulty pression system, mechanical malfunction.No ignition spark Switch on STOP, fault or short-circuit in thewiring, plug cap or spark plug defective.Fuel supply Fuel tank is filled Combination switch in Choke position,carburetor defective, suction head dirty, fuelline bent or interrupted.Compression Inside Cylinder base packing ring defective, radialsystem shaft packings defective, cylinder or pistonrings defectiveOutside Spark plug does not seal.Mechanical Starter does not engage Spring in starter broken, broken partsmalfunction inside the engine.Warm start difficulties Carburetor Fuel tank is filled Wrong carburetor adjustment.Ignition sparkEngine starts, but Fuel supply Fuel tank is filled Wrong idling adjustment, suction head ordies immediately carburetor dirty.Tank venting defective, fuel line interrupted,cable defective, Combination switch defective,Decompression valve dirtyInsufficient power Several systems Engine is idling Air filter dirty, wrong carburetor adjustment,may be involved muffler clogged, exhaust channel in cylindersimultaneously clogged, spark arrester screen clogged.No chain lubrication Oil tank/pump No oil on the chain Oil tank empty.Oil guide groove dirty.Oil-pump adjusting screw incorrectly adjusted.