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2286 engine set up with Suzuki 140

rnobbs Member Posts: 1
we have a 2018 Sweetwater 2286 with 2017 140 Suzuki motor and can't seem to get the set up/prop correct.  boat doesn't run over 20mph  with 2 adults in unfortunately the dealer is no help so turning to y'all.
looking forward to the recommended engine placement (hole selection) and prop
have tried all the way down (top hole) and down two and seems to be sucking air (cavitating) when applying even minimal trim. boat appears to be spraying a lot around the motor/transom.  
have tried 14/17 four blade and 14/19 three blade and nothing seems to be getting speeds advertized 30mph.  engine appears to have plenty of rpms (6000 at full).  looking for top end speed vs. hole shot.
any help is greatly appreciated.