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1997 Challenger 787 Winterization

Hi All,
I am pleased to be a member of this forum, lots of good ideas and advice. I'm slightly confused about how to winterize this boat. This is my 4th Seadoo craft, and the other 3 I winterized by running pink antifreeze in the lower flush port while the engine was running. The service manual makes no mention of this method, but suggests pinch clamps and hoses to flow the antifreeze. I kinda like the flush method myself, any thoughts?
 
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