6hp johnson won't plane out my 10' jon boat

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ezeke

Supreme Mariner
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Sep 19, 2003
Messages
12,532
Re: 6hp johnson won't plane out my 10' jon boat

ncfish said:
ezek the prop is 8x7.25
Click to expand...

You might be able to find a OE #0386587 which is 8.25 X 5.

Michigan Wheel makes a 012068, 7.75 X 6.5.

Either would give you a better hole shot.

The OE prop came as aluminum or composite; the aluminum ones are better.
 
S

saaber1

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Mar 7, 2010
Messages
16
Re: 6hp johnson won't plane out my 10' jon boat

No way 6hp is enough for that heavy of a boat. I've had 10' 12' 14' john boats over the years. My 12' riveted weighed about 90 pounds and a 7.5 hp would plane it. With the livewells, depth, etc. of that boat I would use a 15hp johnson/evinrude 2 stroke. They only weigh 75 lbs. which is less than many 9.9, 6hp 4 stroke etc. Can't hurt to have a little extra power and they cost the same as a 9.9
 
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ncfish

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Mar 24, 2010
Messages
37
Re: 6hp johnson won't plane out my 10' jon boat

jay_merrill said:
I have a '56 Johnson 5.5 hp motor that once did double duty an an auxilliary motor in a 26 foot sailboat and as the motor that I used on a 9 foot, homemade dingy. The dingy had a flat bottom and was made of plywood and fiberglass. The 5.5hp Johnny planed it easily. The motor was also a long shaft at the time, so there was a lot of drag from the midsection and gearbox sticking down, way below the bottom.

Unless you boat is particularly heavy, I don't see any reason why a 6hp outboard wouldn't plane it. In fact, it should plane at a pretty low speed.

So, my next question is - what does the boat weigh?


BTW, please resize your photos to no more than 640 pixels on the longest dimension. As they are now, most readers will have to scroll right/left, in order to reas the text in posts.



???
Click to expand...

thats a good question, i have no idea, all i can say is it's two man heavy, thats what it took to load in the truck. two more would have been much easier. ps. I'm not computer savvy i thought i was doing good just to post a picture. sorry for any inconvenience i may have caused.
 
D

DJ

Guest
Re: 6hp johnson won't plane out my 10' jon boat

I agree, the boat looks terrific! Great job!
 
jay_merrill

jay_merrill

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5,653
Re: 6hp johnson won't plane out my 10' jon boat

ncfish said:
thats a good question, i have no idea, all i can say is it's two man heavy, thats what it took to load in the truck. two more would have been much easier. ps. I'm not computer savvy i thought i was doing good just to post a picture. sorry for any inconvenience i may have caused.
Click to expand...

Weight and prop pitch might be your issue. Even if the boat is a "two man lift," its small and you could probably weigh it by getting some help and planting a corner on a bathroom scale, with the boat on end so that all the weight is on the scale. It might be useful to do that, just so you know what your boat's empty weight is.

The 7.25 inch pitch prop that you have isn't helping your situation, but it would be fine for most 10 foot boats. The reason why my 5.5 Johnson pushed a big, heavy sailboat, is because it had a low pitch prop on it and a displacement hull doesn't require much power to move at minimal speeds. As long as I wasn't dealing with seas, a headwind or an opposing tide, it served its purpose in getting me in or out of a slip, or in/out of a harbor.

Getting a boat up on plane is another matter. The good news is that your boat has a flat bottom, which requires much less power than a v-type hull, to plane. The "bad" news, is that your boat is a bit "beefier" than the average 10' jon, so its probably heavier than most, as well. You are also carrying a battery and water in a live well. You could have an extra 100 pounds of weight, just between those two items.

At this point, I think I would go find a prop with less pitch. You can buy one right here at iboats. The one in the following link is 6-1/2" pitch. One thing, however, if your motor is a 1965, this prop won't fit. It will fit later models.

http://boatpropellers.iboats.com/Jo...andard&**********=500608057&*******=155844317


Don't worry about the photos. Everyone puts large photos up the first couple of times. You can resize your originals using the editing tools in Photobucket or with Picasa. Keeping the size down makes it easier to read threads, makes the photos load faster (less band width) and reduces server storage requirements.



???
 
B

bob johnson

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Re: 6hp johnson won't plane out my 10' jon boat

that boat probably weighs close to 200 lbs...but as a flat bottom, it should'nt draft that much...have you tried a tiller extension???? start the motor and move up to the middle seat.....

i would not hesitate to put a 15 hp on that boat!!!!

a 9.9 weghs the same as a 15...go for the extra power...you dont have to turn the throttle all the way you know!!!!

you dont always floor your truck do you???

I was at a boat launch last weekend and a guy putting a 12 or 13 foot whaler in the water with a 40 hp on it!!!!!!!!!!!!!!!!!

anyway it was soooo smalllllllllllllllllllllllll!!! the motor looked HUGE


ps, I d check the trim pin and see where it is, maybe even move it to the lowest setting...might help get that lower unit up tight to the transom...which if you didnt have the inside photo of the transom I would have sworn it was a flat transom based on the picture of the boat and motor sitting on the flat bed!!!!!!!



bob
 
R

rjezuit

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Sep 24, 2007
Messages
418
Re: 6hp johnson won't plane out my 10' jon boat

If you can put a tachometer on it, much of what has been suggested would be verified. Tinytach makes one that wraps around a plug wire. it will tell you the RPM and what pitch you can go to. Rick
 
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ncfish

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Mar 24, 2010
Messages
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Re: 6hp johnson won't plane out my 10' jon boat

thanks for all the suggestions, i will post back when i get this thing on plane, im in learning on some of this stuff, but just one more question, when doing some wiring i had to remove the top of the bow, it was packed with foam insulation im guessing it is to damper the bow smacking the water?
 
T

tx1961whaler

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May 31, 2008
Messages
5,197
Re: 6hp johnson won't plane out my 10' jon boat

ncfish said:
thanks for all the suggestions, i will post back when i get this thing on plane, im in learning on some of this stuff, but just one more question, when doing some wiring i had to remove the top of the bow, it was packed with foam insulation im guessing it is to damper the bow smacking the water?
Click to expand...
It's probably flotation to keep the boat from sinking to the bottom if it was swamped,
 
B

bob johnson

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4,306
Re: 6hp johnson won't plane out my 10' jon boat

ncfish said:
thanks for all the suggestions, i will post back when i get this thing on plane, im in learning on some of this stuff, but just one more question, when doing some wiring i had to remove the top of the bow, it was packed with foam insulation im guessing it is to damper the bow smacking the water?
Click to expand...

imagine if the boat got a hole punctured in the side while out in the water and it started to fuill up with water...once the water came over the top.... the metal boat would sink to the bottom of the lake...

but foam stored in under the seats and the bow, keeps the boat from sinking...and provides the boater with a place to hang onto until help arrives.

so it not only could save your life...it keeps you from losing your boat..

because you can get it towed to the shore and emptied, then you can fix the hole and be back to boating..

bob
 
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ncfish

Seaman Apprentice
Joined
Mar 24, 2010
Messages
37
Re: 6hp johnson won't plane out my 10' jon boat

bob johnson said:
imagine if the boat got a hole punctured in the side while out in the water and it started to fuill up with water...once the water came over the top.... the metal boat would sink to the bottom of the lake...

but foam stored in under the seats and the bow, keeps the boat from sinking...and provides the boater with a place to hang onto until help arrives.

so it not only could save your life...it keeps you from losing your boat..

because you can get it towed to the shore and emptied, then you can fix the hole and be back to boating..

bob
Click to expand...

Thanks bob, im glad i put back what i took out. i had a feeling it was something important.:)
 
N

ncfish

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Joined
Mar 24, 2010
Messages
37
Re: 6hp johnson won't plane out my 10' jon boat

ok well i made a tiller extension out of 1 1/2 pvc, and moved to the middle and it did pick up a little speed, but it still diden't get out the hole, i have a tiny tach on order, i still haven't weighed the boat, i dont think our digital scale will work as it only gives you a few seconds then freezes the read out. if that makes sense. and a smaller pitch prop seems hard to find, so i got a deal on a 1979 15hp evinrude with electric start:D had to drive 2hrs across state line to get it, but man was it worth it! it was a kicker on a 70's 19' boat, compression i got was 112psi on top and 110 on bottom from the pull rope, the lower unit oil was the color of fresh motor oil, and no metal or milky stuff. i have an impeller on order, when i get that in i will be off to the lake, if this bad boy wont get it on plane i will just give up! just to stay on topic im adding a tip and pic of the rope starter removal to get to the carb nut, it made it a lot easier. also used duct tape got that from here..thanks. the 1/4 bolt stoped it from winding the rope up which we all know makes it a pain to put back....i may post a link to video when i get this thing on plane if anyone is interested.. thanks again.
 
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