Honda HT3810 Owner's Manual page 38

2. Change the engine oil (See p. 41)
NOTE: If the lawn tractor will be stored for longer than 3 months, remove
the spark plugs and pour three tablespoons (approximately 1 oz.) of clean
motor oil into each cylinder.
Place the PTO (Power Take-off) lever in the ON position. Turn the front
clutch several rotations by hand, then return the PTO lever to the OFF
position. Reinstall the spark plugs.
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CAUTION: Be sure to wear heavy-duty gloves when turning the front clutch.
If the lawn tractor has been running, the engine will be very hot. Allow it to
cool before proceeding.
3. Remove the battery and store in a cool, dry place. Recharge it once a
month.
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