Easy to do just dip it in hot water .
if it opens it good , you could even use a thermostat to test heat of water and determine the exact tempreture
it opens at , if your so inclined .
if it opens its good enough for me .
if not try for new and used thermostats here
You can also test the temperature sensor fitted to the cylinder head
Test between the connection at the top of sensor and
the earth of the threads , did in hot water and it should decrease in resistance ohms
value as the sensor gets hotter , if not renew here .
Spark plug dirty, broken, or maladjusted
Spark plug incorrect
Fuel/air mixture incorrect:
Main jet clogged or wrong size
Fuel level in carburetor float bowl too low
Carburetor holder loose
Air cleaner poorly sealed, or missing
Air cleaner duct poorly sealed
Air cleaner clogged
Carbon built up in combustion chamber
incorrect head - barrel combo
other cylinder/head piston faults
Engine oil level too high
Engine oil viscosity too high
Drive train trouble
Engine oil level too low
Engine oil poor quality or incorrect
cooling system :
Coolant level too low
Radiator cap trouble
Water pump not turning
Water pump impeller damaged
Water leak somewhere in system
need a new radiator try here .
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