I'd go with the 15. Don't think you'll see a difference idling.
2018 G3 Sportsman 17
2018 Yamaha F90 four stroke
Ultra 106sv bow/console
Livescope Terrova 24v Ionic lithium batteriesup2specks LIKED above post
Thank you for all the input everyone. I'm going to go with the 15 EFI and if its pushes little to fast Ill use a troll plate to slow it down. I'll be picking it up tomorrow weather permitting. I use a troll plate already on my pontoon and it works great.
shadboy LIKED above post
It's found a new home. Picked it up yesterday.
Now just have to wait till this dang cold (9deg now) weather breaks to get it installed.
Atimm693, Smitty39365 LIKED above post
Patiently waiting to see the results.
Creativity is just intelligence fooling around
Maybe able to get it on the boat this weekend but highly unlikely I see any water in a liquid form anytime soon to test.
That is made by Tohatsu for Merc and are reported to be excellent motors.
Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va
I have a 15 four stroke merc on my 18 foot Ranger Fisherman and 1.5 mph is the slowest speed I can manage. They make a trolling prop now for merc's but it does not fit my long shaft Bigfoot motor. I would go for the 15 if your boat will handle that. Do a little research from your dealer of choice, I'm sure the technology is better today than my 20 year old 4 stroke.