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This has been discussed in 2 new posts in the past 2 weeks (or searched the 190 forum) and the remedy/flapper scupper has been suggested to me by the factory.
It is very common with Bay 190's (and with almost any sailboat). You should have a loop of bilge discharge hose going above the water line but once the pump cycles off "back siphoning" may occur is the bilge thru hull is below water line. Install a "flapper scupper" over the thru hull.
A Whale check valve would be an idea (duck bill rubber valve in plastic housing) but you would probably have to pull the whole transom deck up to get to everything. Plus, it could slow discharge as well as become clogged. Call Triumph warranty service dept and they or dealer might send you the flapper style....they couldn't be more than $5 from the look of em.
Your boat has some extra weight in the transom, possibly, such as batteries, storage, heavier than design motor (2 stroke), passengers and possibly water in the inner hull which makes the boat ride an inch or two lower. Mine now rides a little higher now my inner hull is dry/crack repaired.
Just read thru all the posts in the Bay 190 forum, the answers should be in there.
Good Luck, Molar
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