The SV620 is what you get when an industrial designer heads a team. They expect the blower housing to be removed periodically from cleaning, so they made it a not horrible task. Hence the instructions for changing the spark plug include removing the blower housing.
http://www.kohlerpower.cn/engines/onlinecatalog/pdf/SM_SV470_SV620_2.11.pdf
Husquvarna Riding Mower Spark Plug Change
https://youtu.be/xF-TO2QsLag?t=252
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