Thinking about putting an 8 hp (probably) a Honda 4 stroke on a 1436 John boat. Motor will be about 84 pounds then the gas can. Is this too heavy. Anyone out there using a similar set up? All the 4 strokes I have looked at less then 8 hp are single cyl. have a nasty vibration and are noisy. Whats your opinion?
You will be fine with an 8 HP, 4 stroke.
Just plan on balancing it with some weight up front, like a passenger, ice chest or battery.
You're set up will be fine weight wise.
The BIA plate on your jon boat should tell you, but you sure will not be over the rated hp for a 14 footer. Your motor, if it is a short shaft, will be 92# with the tank. I have run my 9.8 Merc at 64# on my 10' jon boat and it went real good. Not to say that my 2.3 Honda might have been a better, safer choice, but that 9.8 didn't sink it.
I have seen MANY 14ft 36in wide Duracraft boats with 20 HP motors on them. Boats were completely safe. I had a Honda 3 cyl. 30 hp on a 16 ft 42 in for several years, fantastic fishing rig. I am almost 74 YO and some of you may have never seen are heard of a Duracraft Fisherman or it's carbon copy the War Eagle.
My old Alumacraft (1976) has a 20hp rating tag on it and I've been running a 15hp Evinrude since the mid 80's
Short shaft? Aren't those model sizes built with the shallower transom?
Osky
The problem is, the horse power rating on the boat is correct but the weight of the new 4 strokes are nearly double the wight of the old 2 strokes. The smaller boats can take the horse power but not the weight . I used to run a 15 hp motor on the same boat and it was just fine. Now just one person and the weight of the motor and gas is close to over loaded. With that much weight all in the back it makes the bow stick up and the transom dangerously low. Sad situation..
I assume that would be the "Sloop John B".
I have a 1436 " Jonny" .. I have a 3.5 horse and it plains with me and my son. I dont use exterior gas can though. I also put a 5 horse Merc but it is a long shaft on a short shaft boat. It works and it plains very good. I use the 5 horse long on my bigger boat and dont care to have 2 motors so I started using my long 5 horse Merc. I do wish I would have went with an 8 horse cause its a 2 cal. and likely much smoother. My single cyl. 5 horse is not smooth. It uses very little gas however.
No issues with the 8hp 4 stroke on a 1436. Standard rig around here. I was looking at the Honda 9.9 for my 1436 but went with a Suzuki 9.9 EFI instead.
The 15 or so extra pounds a 8 or 9.9hp fourstroke has over an older two stroke, or a smaller 4 stroke really isn't much as far as weight in the boat. Its more of a issue if you have to tote the motor around from the garge to the boat a lot. As far as balance in the boat get or make a longer fuel line and move the fuel tank up front. If you have an electric on the boat you can also move the battery around to help level the boat.
I have a 6hp tohatsu on a 12 ft V-hull and while I agree its got a lot more vibration than a twin cylinder, particularly at low ( trolling speeds), as long as you primarily using it to go from point A to Point B a 6hp would serve fine. If your going to troll a lot then I would definitely go for the 8 or 9.9. Even though the 6 does vibrate a bit, it doesn't load up like a 2 cycle and you can troll with it, its just not smooth.