Yamaha 20C Service Manual
Also see for 20C: Owner's manualOwner's manual
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Contents
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9-6EROUGH IDLINGTRBLSHTGO50000-0*ROUGH IDLINGIs the fuel fresh?Are all wiring connections tight?Replace the fuel.Tighten.YESYESNONOAre the spark-plugs tightly screwed in? Tighten. (P.3-14)YESNODoes sparking take place in all cylinders?YESNOIs the lighting coil used to supply a heavy load? Disconnect the load.NOYESAre the ignition sequence and timing correct? Correct this. (P.3-9 – 3-12)YESNOAre the settings of the carburettor correct? Correct the setting. (P.3-8)YESNOIs the magneto base loose? Tighten.NOYESDoes the reed-valve seal effectively? Replace the reed-valve.YESNODoes the flywheel have excessive run-out? Check the crankshaft (P.5-20)NOYESDoes the fuel-pump operate normally? Replace.YESNODoes the compression meet the specified pres-sure?Inspect the cylinder piston head gasketand piston rings for wear and damage.(P.5-15, 5-19)YESNORE-CHECKGO TO (P.9-4)3 |
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