Yes, lots of good advice here- shut the fuel off and run it (in the water or on muffs) till it runs out of fuel, pull it, trim it all the way down to drain any residual h2o and add fuel treatment to the tank. You can also pull the spark plugs and throw a squirt of mystery oil in each cylinder. Definitely change the lower unit oil. On a new, bigger HP engine - read the owners manual and follow it carefully as they might specify what to use to 'fog' the cylinders. No anti-freeze needed.
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