16hp Vanguard replacement

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I have an alkota 5305 hot water washer with a 16hp B&S Vanguard model #303447 would like to repalce and upgrade the motor to a 20hp Honda. what would be a easy bolt in replacement and model #. I'm running a Rk-2120 AR pump


Iif someone can read there engine code on there alkota 5355J That would help alot too model # and Variation example "honda GX620" (QDF QXA QYA QAF1)

Thanks Tom