Yamakoyo YK250 Owner'S Manual Download | Manualshive

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Summary of Contents for YK250

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Page 2: ...l for printing Only the D Type is equipped for both electric and manual starting Indicates serious injury or death will result if instructions are not followed DANGER Pay special attention to these sy...

Page 3: ...NS 3 CONTROLS 4 CHECK BEFORE OPERATION 5 OPERATION 6 MAINTENANCE 7 STORAGE TRANSPORTING 8 TROUBLESHOOTING 9 TECHNICAL CONSUMER INFORMATION 10 SPECIFICATIONS 11 WIRING DIAGRAMS 12 OPTIONAL PARTS BATTER...

Page 4: ...precautions that should be observed in conjunction with engine startup shutdown operation or protective apparel that may be needed to operate the equipment ENGINE SAFETY The engines are designed to gi...

Page 5: ...CATIONS 2 COMPONENTS CONTROL LOCATIONS FUEL FILLER CAP FUEL TANK OIL DRAIN PLUG OIL FILLER CAP DIPSTICK IGNITION SWITCH STARTER GRIP SPARK PLUG THROTTLE LEVER MUFFLER AIR CLEANER RECOIL STARTER CHOKE...

Page 6: ...ng and to reduce the possibility of fuel leakage Throttle Lever The throttle lever controls engine THROTTLE LEVER speed Moving the throttle lever in the directions shown makes the engine run faster or...

Page 7: ...fuel mixture for operation after starting and for restarting a warm engine Some engine applications use a remotely mounted choke control rather than the engine mounted choke lever shown here Recoil S...

Page 8: ...ngine oil level before startup Check the air filter A dirty air filter will restrict air flow to the carburetor reducing engine performance Check the fuel level Starting with a full tank will help to...

Page 9: ...shutdown or operation STARTING THE ENGINE 1 Move the fuel valve lever to the ON position 2 To start a cold engine move the choke lever to the CLOSE position To restart a warm engine leave the choke l...

Page 10: ...mounted throttle control rather than the engine mounted throttle lever shown here 4 Turn the engine switch to the ON position 5 Operate the starter RECOIL STARTER all engine types Pull the starter gr...

Page 11: ...in an emergency simply turn the engine switch to the OFF position Under normal conditions use the following procedure 1 Move the throttle lever to the SLOW position Some engine applications use a remo...

Page 12: ...the desired engine speed Some engine applications use a remotely mounted throttle control rather than the engine mounted throttle lever shown here For engine speed recommendations refer to the instruc...

Page 13: ...usty conditions consult your servicing dealer for recommendations applicable to your individual needs and use MAINTENANCE SAFETY Some of the most important safety precautions are as follows However we...

Page 14: ...tilation whenever you operate the engine Burns from hot parts Let the engine and exhaust system cool before touching Injury from moving parts Do not run the engine unless instructed to do so Emission...

Page 15: ...ch flames or sparks Keep gasoline away from appliance pilot lights barbecues electric appliances power tools etc Spilled fuel is not only a fire hazard it causes environmental damage Wipe up spills im...

Page 16: ...y engine speed under normal load change brands of gasoline If spark knock or pinging persists see an authorized servicing dealer ENGINE OIL LEVEL CHECK Check the engine oil level with the engine stopp...

Page 17: ...ly Please dispose of used motor oil in a manner that is compatible with the environment We suggest you take used oil in a sealed container to your local recycling center or service station for reclama...

Page 18: ...iller neck but do not screw it in 3 If the level is low fill to the upper level mark with the same oil recommended for the engine SERVICING YOUR ENGINE ENGINE OIL RECOMMENDATIONS Oil is a major factor...

Page 19: ...E or SF oil AIR FILTER INSPECTION Remove the air cleaner cover and inspect the filter Clean or replace dirty filter elements Always replace damaged filter elements If equipped with an oil bath air cle...

Page 20: ...air filter element Clean in warm soapy water rinse and allow drying thoroughly Or clean in nonflammable solvent and allow drying Dip the filter element in clean engine oil and then squeeze out all ex...

Page 21: ...lated dirt with nonflammable solvent and dry the case 5 Fill the air cleaner case to the OIL LEVEL mark with the same oil that is recommended 3 for the engine Oil capacity 2 0 US oz 60 cm 6 Reassemble...

Page 22: ...there is any leakage SPARK PLUG SERVICE Recommended spark plugs F7RTC or other equivalents 1 Disconnect the spark plug cap and remove any dirt from around the spark plug area 2 Remove the spark plug...

Page 23: ...hten 1 8 1 4 turn after the spark plug seats If installing a new spark plug tighten 1 2 turn after the spark plug seats 7 Attach the spark plug cap IDLE SPEED ADJUSTMENT 1 Start the engine outdoors an...

Page 24: ...1 Remove the three 4 mm screws from the exhaust deflector and remove the deflector 2 Remove the four 5 mm screws from the muffler protector and remove the muffler protector 3 Remove the 4 mm screw fro...

Page 25: ...ems will vary with such factors as gasoline blend your storage temperatures and whether the fuel tank is partially or completely filled The air in a partially filled fuel tank promotes fuel deteriorat...

Page 26: ...ure that treated gasoline has replaced the untreated gasoline in the carburetor 3 Stop the engine and move the fuel valve to the OFF position DRAINING THE FUEL TANK AND CARBURETOR 1 Place an approved...

Page 27: ...stem cool cover the engine to keep out dust A hot engine and exhaust system can ignite or melt some materials Do not use sheet plastic as a dust cover A nonporous cover will trap moisture around the e...

Page 28: ...y fouled or improperly gapped Gap or replace spark plugs Spark plugs wet with fuel flooded engine Dry and reinstall spark plugs Start engine with throttle lever in FAST position Fuel filter clogged ca...

Page 29: ...ls cannot cause a short circuit if they touch a grounded part while tightening the positive battery cable end 1 Connect the battery positive cable to the starter solenoid terminal as shown 2 Connect t...

Page 30: ...is necessary to loosen the throttle lever friction nut when operating the throttle with a remotery mounted control YK 250 YK 300 YK 400 YK 550 650 E YK 550 650 E R YK 550 650 E L 27 TECHNICAL CONSUME...

Page 31: ...fications to the carburetor If you always operate your engine at altitudes above 5 000 feet 1 500 metres have your servicing dealer perform this carburetor modification This engine when operated at hi...

Page 32: ...ated fuel try to confirm the fuel s contents Some areas require this information to be posted on the pump The following are the EPA approved percentages of oxygenates ETHANOL ethyl or grain alcohol 10...

Page 33: ...gine inspected and repaired by your servicing dealer Hard starting or stalling after starting Rough idle Misfiring or backfiring under load Afterburning backfiring Black exhaust smoke or high fuel con...

Page 34: ...CAL CONSUMER INFORMATION ITEM SPECIFICATION Spark plug gap 0 028 0 031 in 0 70 0 80 mm Valve clearance IN 0 15 0 02 mm cold EX 0 20 0 02mm cold Other specifications No other adjustments needed Engine...

Page 35: ...342 342 391 315 376 362 376 362 371 335 335 335 335 25 28 16 19 15 5 18 5 16 5 19 5 19 22 Model Type Max torque N m rpm Valve Clearance Recommended power kW 3600rpm Fuel consumption g kW h Idle speed...

Page 36: ...0 E R Single cylinder 4 Stroke Forced Air Cooling OHV 5 3 6 0 5 3 6 0 5 3 6 0 16 5 3000 19 3000 32 1500 37 1500 32 1500 37 1500 395 1400 150rpm 10 Chain Mode Clutch Mode 2 1 73x58 77x58 73x58 77x58 73...

Page 37: ...ission Mode Gear transmission Reduction Ratio 2 1 Bore Stroke mm 82x64 88x64 82x64 88x64 Displacement cc 337 389 337 Compression Ratio 8 1 Lubricating mode Splash Starting Mode Recoil start Recoil sta...

Page 38: ...TTERY SPARK PLUG TRANSISTORIZED IGNITION UNIT BI BI Br Br CONTROL BOX OIL LEVEL SWITCH CHARGING COIL RECTIFIER FUSE ENGINE SWITCH CIRCUIT BREAKER W W W Y Y W BI W BI W ENGINE SWITCH IG E ST BAT OFF ON...

Page 39: ...Engine Type with Oil Alert and Without Electric Starting 36 WIRING DIAGRAMS ENGINE SWITCH SPARK PLUG BI OIL LEVEL SWITCH Y Y OIL ALERT UNIT BI Y TRANSISTORIZED IGNITION UNIT Bl BLACK Y YELLOW G GREEN...

Page 40: ...low the correct procedure seriously injuring anyone nearby Keep all sparks open flames and smoking materials away from the battery WARNING LOWER LEVEL UPPER LEVEL Check the electrolyte level to be sur...

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