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Thread: 9.9 part 2

  1. #11
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    Quote Originally Posted by chetc View Post
    i was thinking about the tach, had one on a single cyl bike, i see the hardline's are popular, not sure of the redline rpm's yet, but example let's say it over revs by 3 hundred rpms with the stock prop, i see on youtube where some owners are installing a zip tie on the carb stop to limit the travel of the throttle plate in wide open position, if this is done then i take it the boat will be possibly 2 mph slower, now on the other side of this, if i were to change pitch to get it into the right engine rpm's would i gain much in speed.



    chet
    That would work if you have the most prop you can run and still plane, but the max RPMs are too high.

    I would pay a visit to your local prop shop, as you'll likely have to try several before you find one that is the best compromise.

  2. #12
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    Chet, Iíll tell you my story/setup. Iíve got a 1436 jon with the same motor as yours. My boat will go 23 mph with just me and gear, or about 17-18 with passenger. That is always subject to change with weight distribution.

    I donít know anything about your boats weight or dimensions, but on my 14 ft boat I previously had a 15 hp 2 stroke with a fin. The fin made it plane quicker but it plowed the front end through the water if I added any weight up front. Would get about 24 mph on gps with it but it would splash a little. Holeshot was good.

    On my new motor I initially bought one, but returned it before I drilled the holes for two reasons:
    1) the tail would have been to close to my new transducer on my narrow boat.
    2) the modern trim tab that is below cavitation plate on motor doesnít leave much room for holes.

    Can it be done? Iím sure it can, but I elected not to for those reasons. Am I happy with it? Yes, for now I am. It planes slower, but when it planes out it is SMOOTH compared to what it used to be.

    My two cents I wouldnít add anything to it until you break it in and open it up! Then youíll know what you really have there.


    Sent from my iPhone using Crappie.com Fishing mobile app
    God Bless You
    Likes NCkenner LIKED above post

  3. #13
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    this is how it goes, after 3 times out with the new 9.9 mercury on my 14ft smokercraft boat model is the big fisherman, i added a front casting deck and it is carpeted, battery up front for trolling motor and battery in rear for elec start, with me any my wife in the boat and our gear i weight 205 and my wife around 130, i feel this is a sort of heavy boat, the first 2 times out i went by the rules not to run it too hard ect. yesterday i did crank it wide open, on smooth water with a little wind help me, the best i can get was maybe 9 or 10 mph coming back into a breeze maybe 6 mph, i do notice that the boat does not seem to increase speed over 1/2 throttle, the RPM's are not there, i guess i will have to get some sort of a tach...and take it from there or take a chance on a prop, but not sure where to start


    chet

  4. #14
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    Quote Originally Posted by chetc View Post
    this is how it goes, after 3 times out with the new 9.9 mercury on my 14ft smokercraft boat model is the big fisherman, i added a front casting deck and it is carpeted, battery up front for trolling motor and battery in rear for elec start, with me any my wife in the boat and our gear i weight 205 and my wife around 130, i feel this is a sort of heavy boat, the first 2 times out i went by the rules not to run it too hard ect. yesterday i did crank it wide open, on smooth water with a little wind help me, the best i can get was maybe 9 or 10 mph coming back into a breeze maybe 6 mph, i do notice that the boat does not seem to increase speed over 1/2 throttle, the RPM's are not there, i guess i will have to get some sort of a tach...and take it from there or take a chance on a prop, but not sure where to start


    chet
    You are expecting a lot out of that 9.9. A 25 would be more appropriate for that load.

    A hydrofoil and different prop will make it easier on the motor, but don't expect much.
    Likes Redge LIKED above post

  5. #15
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    Quote Originally Posted by Atimm693 View Post
    You are expecting a lot out of that 9.9. A 25 would be more appropriate for that load.

    A hydrofoil and different prop will make it easier on the motor, but don't expect much.
    i know a 9.9 would not be near the 25yamaha i took off, but did not think it would be that bad, as i said the places we fish are mainly 10hp max. going to look into a hydrofoil and a prop

    chet

  6. #16
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    I'm a big hater of those 10hp limits. Our local lakes claim its to prevent erosion but underpowered boats makes far worse waves which equals worse erosion. They finally upped the limits to 25hp and it's been so much nicer.

    I think when it comes to legally running and expecting any type of performance from a 9.9hp motor you need to make sure the hull is adequate. I like a 1442 flat bottom or mod-v for those small motors. Its fairly stable and they are very light bare bones. If you want a deck you can add on easily with aluminum angle and sheet and hardly add any weight. On 25hp outboards and below, I run a U1 size lawn mower battery to save weight there and use a 3 gal tank instead of a 6 gal one. Personally I like the old 9.9hp 2 strokes that you could turn into 15hp motors. I also like recoil start only to save a little weight on the motor and eliminating the starting battery.

    Any chance you could post pics of your boat?

  7. #17
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    Quote Originally Posted by scout-j-m View Post
    I'm a big hater of those 10hp limits. Our local lakes claim its to prevent erosion but underpowered boats makes far worse waves which equals worse erosion. They finally upped the limits to 25hp and it's been so much nicer.

    I think when it comes to legally running and expecting any type of performance from a 9.9hp motor you need to make sure the hull is adequate. I like a 1442 flat bottom or mod-v for those small motors. Its fairly stable and they are very light bare bones. If you want a deck you can add on easily with aluminum angle and sheet and hardly add any weight. On 25hp outboards and below, I run a U1 size lawn mower battery to save weight there and use a 3 gal tank instead of a 6 gal one. Personally I like the old 9.9hp 2 strokes that you could turn into 15hp motors. I also like recoil start only to save a little weight on the motor and eliminating the starting battery.

    Any chance you could post pics of your boat?
    I AM A BIGGER HATER TOO, i sold a 25 Yamaha last fall the boat was fast, it flew, then i went with the mercury 9.9 what a waste of 2900 bucks, i will not put it in the river, i don't think the motor will take me upriver in the current, but i will get pics, and this boat by no means is a light weight, fully carpeted 2 big batteries and i added a casting deck. i am thinking of selling everything and start over with a 15ft mod vee hull, a boat similar to Richard Gene's Allweld. the other day with a little breeze in my favor was able to get around 9 or 10mph, going into the breeze, whew this boat was topping maybe 6 or7 mph. will get some pics later

    chet

  8. #18
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    Quote Originally Posted by chetc View Post
    I AM A BIGGER HATER TOO, i sold a 25 Yamaha last fall the boat was fast, it flew, then i went with the mercury 9.9 what a waste of 2900 bucks, i will not put it in the river, i don't think the motor will take me upriver in the current, but i will get pics, and this boat by no means is a light weight, fully carpeted 2 big batteries and i added a casting deck. i am thinking of selling everything and start over with a 15ft mod vee hull, a boat similar to Richard Gene's Allweld. the other day with a little breeze in my favor was able to get around 9 or 10mph, going into the breeze, whew this boat was topping maybe 6 or7 mph. will get some pics later


    chet
    Hey if you find one of the Allweld boats I don't think you will be disappointed. I bought a 98 model 15' Allweld tiller steer boat and put an older 25 hp Yamaha on it a few weeks ago... me and my son went down on one of the limited hp lakes down next to Scout-J-M yesterday and had a blast. My son likes fishing out of it better than my 18' Triton aluminum.

  9. #19
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    pics of boatName:  IMG_20210801_193640348_HDR.jpg
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  10. #20
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    You are asking a lot from that 9.9, for sure.
    As for a fuel additive, I am well pleased with Mercury Quickare, an ethanol treatment, fuel stabilizer, and corrosion and gum cleaner. Best price I have found is at Walmart, mix one ounce to 10 gallons of gas. I use it in the boat, pressure washer, weed eater, and two lawn mowers. My pressure washer only gets ran once or twice a year, never a problem at start up. My stuff gets stored with a full tank of treated fuel, works for me.

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