Pro-Line 251 I/O to Suzuki outboard conversion

vthartford

Newbie
Apr 7, 2020
1
1
46
Jax, FL
Name
Bill
Boat
1998 Proline 251
I have the same boat, 5.7 with Bravo 3 Drive. I would like to do the same thing you did in a year or two. I love the boat. MPG isnt bad, but I would love more cockpit room, bilge space (I really want to add a Rhodan GPS Trolling motor and need 3 more batteries. We use the boat primarily to dive out of. Lots of gear and lots of heavy tanks. Do you thing it could handle a 350 and would it be worth it?
 
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a7ewizard

Almost A Member
Jun 4, 2009
150
147
SAN RAFAEL,CA USA
Name
WARREN WEISENBURG
Boat
251,PRO-LINE, WIZARD
No, I don't think a 350hp is needed.
I've seen 47mph with about 1/4 fuel. My boat gets some porpoising around 40mph. It's worse with more fuel in the tank. Trim in and/or bow down helps but it is very sensitive. I've tried 4 props but I haven't solved it.
Best cruise is 27 to 30mph at 2.3 to 2.7 mpg depending on fuel and 1 or 2 people.
 
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Greg Busby

Newbie
Jul 13, 2014
5
7
74
Name
Greg Busby
Boat
Parker 2520XL
Great work on the conversion. I have a Suzuki 300hp on my Parker 2520XL. Motor has been great for 10 years. Wanted the 18.5 pitch but couldn't get the right RPMS
and ended up with the 17" pitch. Cruise at 25 with about 2mpg. I'm probably a lot heavier than your boat. Motor is quiet and always starts immediately.
 
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