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I was considering a 50hp honda for my whaler but already have a super clean 70hp yamaha with controls,the honda weighs in at 203lbs and the yamaha weighs in at 223lbs,,do you guys think this will bee TOO much weight motor,I am converting it to a center console and moving the battery console and fuel tank fwd to compensate,thanks Doug.

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Have you been drinking? A 70 on a 13'? Holy smokes....

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no not yet,lol

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All joking aside, it is after 5 o'clock back there... isn't it? :o

Seriously, that is an awful lot of power for a 13'.
Not sure I would even consider driving it unless it had some kind of throttle limiter or stop.

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On the up side, no issues pulling skiers... or most anything for that matter.

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It WILL have a kill switch and I WILL use it,I am more concerned about the weight,may just hang it and drop it in the water and move the weight around to see if it will balance out at all,this will probably limit me to two or three people also,I justed purchased the whaler a couple of weeks ago,stripped it down the first day,filled all the holes then primed with awlgrip 545 then block sanded reprimed sand blocksanded again,the hullsides will be awlgrip royal blue and the inside will be awlgrip off white,I will be adding several layers of 1708 to the transom if the extra horsepower is added,btw the boat is a 78 model.

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Here's a chart we have for Current Engine Choices and their weights for 13' models.

http://www.whalercentral.com/articles...icle_id=78

Check the weights just for reference.

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Thanks Joe,this motor is not out of line weight wise,versus most of the 40hps on that chart so weight may not be as big of an issue as I thought,my lead foot,{arm} might be the problem though,

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I have seen older 13's with the 15" transoms with 75 Johnson stingers, so it's been done. Go for it but watch coming down too fast off plane or you'll take water over the back. Post video and make sure to say "here hold my beer" before starting your run lmao

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There is a difference in the way the 13' and the 15' take corners at speed, at least in my own experience using "normal" HP (but no passengers, 1/2 pint of gas in the tank, leave the anchor, life jackets, cooler, and spare shoes on the beach). The flat bottomed 13 skips around almost like a tunnel hull without leaning into the turn very much. But at some point it digs in abruptly and the adrenaline flows. The 15 tilts into fast turns a little more and doesn't dig as easily. More predictable if you know what I mean.

I had a friend in high school who had a 60 Merc on his 13. He flipped it doing fast turns. I say the 70 is going to be a fine fun thang; I'd do it in a second. But I wouldn't put a novice behind the wheel.

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Have already gained a bunch of good advice today,I was unaware of the hook built into the back of the 13s,I am going to flip the boat over and take out the hook,extend the strakes all the way to the back of the boat,I have a freind that designs/builds boats I will have him look at the bottom and reccomend changes,

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Sounds like too much HP for my taste. When I was younger, I had a merc 200 on a 17' Avenger. Boat went about 75-80 mph, needless to say I flipped the boat hitting a nice size wave that came out of nowhere. Ended up with a dislocated elbow and ripped the boat in half, lucky to be alive. Point is, overpowered boats can be dangerous.

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From my experience a 13 over 40 mph is WAY to dangerous. With 40 hp and propped with a 15"ss I could trim it out, the hull would come up out of the water, I would hit 45.1 mph, and COULD NOT STEER THE BOAT! When I turned the wheel the bow would move in the direction I steered, but the boat still went straight. At some point after turning more it would begin to turn. That's when the trouble started. It would turn, but lean OUTSIDE! Then it would start jumping and eventually the side on the outside of the turn would DIG IN! that would throw you out of the boat if you weren't hanging on for dear life. The excitement was right up there with the terror.
Why am I telling you this? If you remove the hook, which limits your speed, you will be asking for trouble. I've seen a 13 with an 85 on the back. The owner said it was good when he needed to run away from a storm. If you keep the hook and the 70 will push you over 40 mph then it MIGHT be steerable. I find that 40 mph is always enough.
Mike

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I got a funny story to tell. Yesterday my seven year old son and I were hanging out in the garage talking "Whaler" stuff and I told him that this guy on WC wanted to put a 70hp motor on a boat that's the same size as ours. My son knows how fast our boat is with a 40hp on it. When I tiold him a guy is putting a 70hp on his 13', my sons eyes almost popped out of his head in amazement. He told me that the guy is going to kill himself.....I agreed with him. Funny thing is my 7 year old even knows that this is a crazy idea......lol.

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Who in their right mind would try and steer or make abrupt turns in a aired out WOT max or overpowered 13 Whaler? lol

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Only BOB KEMMLER JR would try that as far as I know!!!

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That combination might just qualify one for a Darwin Award.....lol.

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The 1975 13 I just got came with a 1974 65hp Merc rigged on it. The guy I got it from said it was a great motor and would pull a 200+ lbs slalom skier up with 3 people in the boat. I have not run the boat yet but I am looking forward to it. I will let you know how it runs :).

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My 13' with a 40hp can be downright scary solo in any waves. I know I scared some people on the river last year when I had it about two feet out of the water jumping the wake of a large vessel.

I would approach any larger motor with a lot of caution and prop it for payload rather than speed.

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You are "begging", yes "BEGGING" to get hurt ! It will eventually "FLIP", no matter how careful you are ! If you get thrown from the boat, and that kill switch fails, you'll get ground into hamburger by the boat doing circles until the prop strikes you. Seriously, DON'T DO IT ! There's a lot of people telling you "NO" here for a reason, they've seen what can happen out there on the water.

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How many of you run WOT every where you go? Keep it below 60-75% throttle you should be fine.

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lol, I have a 13 with a 40 hp I can't imagine the need for more power.
My gf wants to trade the 40 for a 25 or 30.

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LMAO!!! I picture a man typing in a heavily padded foam suit with a helmet on, hockey gloves and knee /elbow pads. Any boat can and will flip if the operator is careless under the wrong sea conditions.

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and I picture a man in a heavily padded "Rubber Room" with a helmet on, complete with a "Drool Cup", that want's to add a 70 hp to a 13' boat !
LMAO !

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Ya know the 90 weighs the same as the 70, why not just get one of those? Those 3 cyl yammies can be modded for more HP too, maybe you can get 115 or so out of that 90, that should be plenty to pull even the biggest skier up :D

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LMAO in Montana too! At least you guys both agree about the heavy pads and a helmut!

My hi-po boat I think pales in comparison to some of you guys. It was a 16' American with a 150 Merc. Had a custom tuned 2-blade nibral prop and did right around 55 mph. It flew with one guy in it. You had to roll the wheel back and forth to counteract the rhthymic thud of the hull as it alternately went semi-airborne and thudded back down. We didn't call it chine walking back then - a solo run in that boat was called "going for a thud". Turning at speed was an adventure.

After that a 40 on a 13 never quite held the same thrill . . . and my current 60 on a 15 is similarly tame . . .

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i think its a great idea:D
make sure ur kill switch works and go for it!