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LONCIN YF300 User Manual

LONCIN YF300
53 pages
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1
Foreword
The types of motorcycles increased day by day due to new structures
and new technologies are adopted. For users and maintainers knowing
well about the maintenance, adjustment and repair technologies of
LX178MN engine, we made this maintenance manual for more
convenience and better guidance for users and maintainers of Loncin.
All the data, diagrams, informations, performance targets are the latest
when the manual is printing. Loncin motor co. ltd. reserves the right of
revising the manual at any time without notification in advance. All
rights reserved by Loncin motor co. ltd. for any parts of this manual,
and no reprint is allowed before agreed by Loncin.
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LONCIN YF300 Specifications

General IconGeneral
LubricationPressure and splash
Engine TypeSingle cylinder, 4 stroke, air-cooled
Fuel SupplyElectronic fuel injection
StartingElectric
Transmission5-speed
Starting SystemElectric
Fuel SystemElectronic fuel injection

Summary

Foreword

Summary

Precaution in maintenance

Guidelines for using spare parts, lubricant, and ensuring proper fastening of bolts and nuts.

Lubrication system

Notice of maintenance

Introduces washing, inspection, and replacement of lubrication system parts without engine disassembly.

Troubleshooting

Lists common issues like fast oil consumption, dirty lubricant, and lubricant abnormalities.

Checking and adjustment

Notice in maintenance

Details checks and adjustments for engine parts and technological requirements.

Technological requirement

Specifies engine parameters like spark plug type, valve clearance, and ignition timing.

Spark plug

Procedure for checking spark plug condition, insulator, and electrode for damage.

Fuel system

Notice in maintenance

Emphasizes safety precautions when using gasoline and proper handling of fuel system parts.

Troubleshooting

Diagnoses engine starting issues, fuel mixture problems, and idling instability.

Cooling system

Notice in maintenance

Highlights the importance of periodic maintenance and troubleshooting for the cooling system.

Troubleshooting

Addresses engine overheating/under-cooling and coolant leakage issues.

Cylinder head and valves

Notice in maintenance

States that engine disassembly is needed for camshaft, cylinder head, and valve maintenance.

Summary

Overview of basic lubrication requirements for camshaft and valve tappet rod assembly.

Size and specification for each part

Provides standard data and limits for camshaft, valves, and valve springs.

Cylinder body and piston

Notice in maintenance

Ensures proper installation of washer and pin before cylinder installation, avoiding dust.

Summary

Details specifications for cylinder bore, piston, connecting rod, and piston rings.

Specification of each part

Lists standard and limit values for cylinder bore, piston, rings, and connecting rod.

Clutch component

Notice in maintenance

Specifies that clutch work can be done after right crankcase removal without engine removal.

Specification of each part

Details specifications for clutch free distance, plate thickness, and spring length.

Troubleshooting

Addresses clutch skidding issues due to insufficient free moving distance or worn friction plates.

Gearshift system

Notice in maintenance

Ensures no damage to joint surfaces of cover and case during gearshift device maintenance.

Remove cover of gearshift device

Procedure for removing the gear indicator and gearshift device cover.

Remove gearshift spindle

Steps for removing the touching plate, check plate, and gearshift spindle.

Magneto and electrical starting component

Notice in maintenance

Details removal and installation of magneto and starting components without removing the engine.

Crankshaft and transmission device

Notice in maintenance

Explains disassembly and assembly of crankshaft and transmission system before crankcase breakdown.

Troubleshooting

Covers noisy operation and oil leakage issues related to crankshaft and transmission.

Specification of each part

Provides specifications for connecting rod, gearshift fork, and drum.

Fault diagnosis

Hard starting or starting failure of engine

Diagnoses issues like no fuel, faulty spark plugs, or incorrect ignition timing for starting problems.

Insufficient engine power

Identifies causes for lack of power such as clutch slipping, fuel supply issues, or valve clearance.

Bad performance when engine is in high speed

Addresses poor performance at high speeds due to ignition timing, fuel mixture, or engine load.

Abnormal sound of engine

Lists causes for engine noises like valve clearance, piston knocking, or bearing wear.

Bad performance when engine is in low speed or idling

Pinpoints issues affecting low-speed performance like carburetor problems or ignition faults.

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