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Posted

I know nothing about setting one up, I let the pros do that.  But when I got mine, the first thing I did was take it on a river with plenty of water to run it, and spent some time figuring out how shallow it would run.  What I did, though I'm not sure I'd recommend it...I happened upon a slick log that was halfway across the river, and was anywhere from a foot under the water to just above the surface.  I ran over that log in several places of different depths, and when I just barely ticked the log going over it I knew how shallow I could run.  

It's a whole lot different from using a prop motor.  The flat bottom of a johnboat is going to skid on sharp turns since the jet doesn't have a skeg.  You have to learn to time your turn to use the skidding and then steer into the skid just like driving a car on ice.  I spent a lot of time the first day playing with it getting a feel for how sharp I could turn and how to steer into the skid.

Posted
14 hours ago, jdmidwest said:

Running streams in kayaks and canoes helped me alot.  Reading the water and seeing the channel helps keep things going on plane.  But there is always the rock or log that likes to hide.  Or there is a wind that makes it hard to read the water.

100% agree. Reading the water is paramount to mimizing damage.  "look for the V" when running upstream through a shoal, that is the deepest water in the shoal.

everything in this post is purely opinion and is said to annoy you.

Posted

Should work fine on a 1648.  I get about 15 mph going up a steep gradient river in my  Panfish 16 which is a heavy v front light duy bass boat.

In a regular jon without extra weights, it should scoot pretty good with 2 people.  My light jon has a Johnson 20 2 stroke jet on it.

"Life has become immeasurably better since I have been forced to stop taking it seriously."

Hunter S. Thompson

Posted

That motor is a sweetheart, but seeing the oil reservoir laying on the floor is kinda disturbing.🤔

Deleting the oil injection on a Yamaha is not like deleting the oil injection on a Mercury or a Johnson/Evinrude.   I'd suspect that some shade-tree Merc or Johnson wrench has exercised his stupidity there. 😉

Yamaha's do not MIX oil into the fuel before the fuel goes into the carbs.....they inject oil into the intake behind the carbs..... therefore some fuel jet, spark plug, and reed-valve alterations would have to be made in order for it to run pre-mix fuel and live a good life.   And nobody, that I know of, has a clue as to the PROPER way to do that.   

Yamaha's oil injection system is very good, extremely reliable, so I would recommend restoring it....NOT deleting it.    👍

Posted
5 hours ago, fishinwrench said:

That motor is a sweetheart, but seeing the oil reservoir laying on the floor is kinda disturbing.🤔

Deleting the oil injection on a Yamaha is not like deleting the oil injection on a Mercury or a Johnson/Evinrude.   I'd suspect that some shade-tree Merc or Johnson wrench has exercised his stupidity there. 😉

Yamaha's do not MIX oil into the fuel before the fuel goes into the carbs.....they inject oil into the intake behind the carbs..... therefore some fuel jet, spark plug, and reed-valve alterations would have to be made in order for it to run pre-mix fuel and live a good life.   And nobody, that I know of, has a clue as to the PROPER way to do that.   

Yamaha's oil injection system is very good, extremely reliable, so I would recommend restoring it....NOT deleting it.    👍

I agree.  I have had a 40/28, 50, and a 90. all oil injected and all worked excellent.

While hooking the oil injection back up, get a set of reeds and remove the reed limiters.  That will really wake up the motor.

everything in this post is purely opinion and is said to annoy you.

Posted
5 hours ago, fishinwrench said:

Deleting the oil injection on a Yamaha is not like deleting the oil injection on a Mercury or a Johnson/Evinrude.   I'd suspect that some shade-tree Merc or Johnson wrench has exercised his stupidity there. 😉

Yamaha's do not MIX oil into the fuel before the fuel goes into the carbs.....they inject oil into the intake behind the carbs..... therefore some fuel jet, spark plug, and reed-valve alterations would have to be made in order for it to run pre-mix fuel and live a good life.   And nobody, that I know of, has a clue as to the PROPER way to do that.   

Why does it make me so happy to learn new stuff that will have absolutely no relevance to me in the future...  thanks Wrench.

Posted
13 minutes ago, Gumboot said:

Why does it make me so happy to learn new stuff that will have absolutely no relevance to me in the future...  thanks Wrench.

FWIW, almost every oil injection system I have seen on atvs/outboards works the same.  Maybe johnson/evinrude is different?  I always deleted them.

everything in this post is purely opinion and is said to annoy you.

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