15GS 461
3.7 Engine
Always check and, if necessary,
repair the following parts before
looking for faults on the engine:
- Air filter
- Fuel supply
- Carburetor
- Ignition system
Problem Cause Remedy
Engine does not start easily, stalls
at idle speed but operates normally
at full throttle
Oil seals in crankcase damaged Replace oil seals
Crankcase leaking or
damaged (cracks)
Seal / replace crankcase
Engine does not deliver full power
or runs erratically
Piston rings worn or broken Replace piston rings
Muffler / spark arresting screen
carbonized
Clean muffler (inlet and outlet
openings), replace spark arresting
screen, replace muffler if necessary
Air filter dirty or wet Clean or dry air filter, replace if
necessary
Fuel line kinked or cracked Fit new lines and ensure they are
installed without kinking
Decompression valve not closed Close decompression valve, check
and replace if necessary
Engine is overheated Insufficient cylinder cooling. Air
inlets in fan housing blocked or
cooling fins on cylinder very dirty
Thoroughly clean all cooling air
openings and the cylinder fins
Air intake in fan housing is fouled Clean air intake on fan housing
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