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Locate thermostat, on 40 HP it is on the left side of the motor near the top of the water jacket, left side from the back. It is held on by 4 bolts. Remove the flywheel cover, then remove the four bolts holding the thermostat/poppet valve cover. Pull out the thermostat. Be sure to note of the direction in which the thermostat is facing before removal. Put in new thermostat in reverse order. You may need a new gasket.

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