Honda AQUATRAX R-12X 2005 Owner's Manual page 164

Engine Cooling System
7. Turn off the water while leaving the
engine idling.
8. Check the tachometer while running the
engine for less than 15 seconds to rev the
engine below approx.
NOTICE
Operating the engine out of water at high
rpm or for longer than 15 seconds at a time
may cause severe engine and/or exhaust
system damage.
9. Stop the engine.
10. Disconnect the garden hose from the
flushing connector.
11. Push the reverse lever to pull up the
reverse bucket.
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Servicing Your Honda