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Things that can go wrong in the cooling system...

Old impeller-tips worn off, no longer seals to housing
Bad impeller, the brass core has separated from the neoprene blades
O-ring pinched, allows leakage
Impeller to driveshaft key missing
Missing/split gasket
Blocked intake screen
Warped impeller housing/base plate, impeller housing not seated to base plate
Driveshaft seals cracked or pinched
Water tube seals cracked or pinched
Upper water tube seal missing, pinched or cracked
Bent/damaged water tube
Corrosion in the water jacket
Debris in the water jacket (silt deposits, vegetation, pieces of gaskets or seals)
Exhaust leaks into the water jacket
Blocked or malfunctioning bypass valves/poppets
Thermostat malfunction/blockage/corrosion
Improper fuel/oil mix in 2 stroke engines
Improper ignition timing

I've had to deal with all of these problems at least once
either on my own engines or a friends.
 

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Fuel mix doesn't change water flow,
but can make an engine run hotter than desired.
An oil lean mix causes friction,
makes the engine work harder, run hotter.
Leads to early parts failure.

Oil under the cowling?
Somethings leaking.
 
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