I ran a 2004 Merc 115 2 stroke years ago. The motor was a "2+2", meaning 2 cylinders shut down under 1800 RPM. It trolled like a dream. I am running a 1996 Merc 90hp. 2 stroke with oil injection I purchased new, and have been trolling with it since '96. I use 93 octane fuel, add Sea Foam fuel additive, and use a good grade of 2 stroke oil. I change out plugs every spring. If you have a "2+2" motor, you're in great shape to troll with it.
Best I have found:
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I also fish out of Braddocks and almost never troll East or West because of the currents. Try taking a diagonal course, it will be easier to maintain preferred down speed.
Get rid of the "fish icons" and read the sonar picture. 2or 3 fish icons close together may not be fish at all, but a bait ball.
There are plenty of vids on You Tube to help with interpreting your fish finder. I run my gain on manual and adjust as needed. It takes a bit of time to get the picture dialed in ..
My neighbor who used to fish the big lake many years ago is moving and cleaning out the loft in his garage. He came over with a small cardboard box and said; " I forgot I put this box in the loft about 30 years ago,... would you like to buy them cheap?'
Needless to say, I did..... all white backs...
sid, Virtually all sonar manufacturers offer their user manuals online as PDF's. Check out the menu formats and ease of use. I selected a Furuno unit years ago because the settings are done with knobs and dials, I didn't have to push 10 buttons to access a feature. The 600 series are nice units..
https://www.hodgesmarine.com/furfcv628-furuno-fcv628-57-fishfinder-wrezboost.html
Dipsys have settings 1-2-3. Slide Divers have settings 1 thru 6. Look at the pic below. Dipsy on the left, S/D on the right. Set both weights to "0", hold them weight to weight as shown. With a marker, transfer the dipsy 1-2-3 settings to the S/D. The new marks on the S/D should match up approx. to 1 1/2, 2 1/2. and 3 1/2. You now have dipsy settings marked on the S/D. Use the Precision Trolling Guide Dipsy charts for the S/D with the new marks. Diver depth has many variables, but this gets me pretty close.
As a follow up to my last post, I use shorter rods ( 7- 71/2 footers) on my 17 ft. boat, easier to store and handle. The short arm riggers allow a bit more room for the shorter diver rods.
Pic of Starboard side set, 2 rigger rods stacked 10 ft. apart, the forward rod on the left is a wire diver. Everything clears nicely.