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Posts: 437
| Dave, I have a Suzuki as well (though a 150) and the inlet hole for the speed had gotten plugged a couple times by weeds or some wood causing it to not function at all. Comparing it to GPS, it is a few MPH faster (meaning GPS reads a lower MPH) than the guage on the boat.
What I did to clean mine out was disconnect the hose, its a clear hose and there is a splice at the base of the motor right where all the cables come out of the engine. Pull that apart there. Then take a VERY small drill bit or if you are lucky enough to have a dentist pick poke that in the inlet hole at the base of the lower unit to loosen up what might have gotten in there. Then using some compressed air (do not pump up over 20PSI) blow into the line toward your speedometer. You should be able to see your guage go up. Then blow back toward the motor, hopefully whatever got in there blows right back out.
You cannot see any hoses other than where they come out of the front of the motor by all the cables. Everything else is inside.
When you said you at a 13 inch prop I was surprised because that seemed extremely small to me, but I dont have that motor. I was thinking a 14 would be much better and it looks like you have found some info to support that.
I believe the 90/115/140 share the same engine block. Not 100% sure, but I know the 115 and 140 do.
I would bet with the right prop and GPS you would be in mid to upper 30's for speed. My buddy has the same boat (with a full windshield) and he gets 34 MPH. He has a 90 Yammy or I would ask what prop he has on it, but it wont really correlate for you.
Do not put one of those wings on there, they really dont work provided you put the right prop on.
I did a quick search on Ebay and found two 14 x 19 props. $160 ish. The Johnson 4 strokes are made by Suzuki so you can use one of them as well, but make sure its a Johnson 4 stroke.
Edited by Captain 8/24/2011 8:24 AM
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