1960 sportwin 10 hp

[sctrr1]

I have a 12 foot basstracker tadpole with a 1960 sportwin 10 hp on it. It will not plane the boat with 200 lbs in it. I cleaned the carb and put new plugs in it. After investigating i found out the butterfly valv in the carb is not openind fully. i looked at the linkage and found no way to adjust it. the linkage is connected on the shaft with a screw but the shafts are cut with a flat spot on them so the linkage will not slip.I have adjusted the mixture needles and have had no luck.Should this motor be able to plane this boat?<br />Please help..

 

[Lark40]

Re: 1960 sportwin 10 hp

When that engine was new, they could plane my friends' 9 foot runabouts, carrying one 120 pound kid.<br /><br />Anything bigger, like a 12' boat required an 18.

 

[sctrr1]

Re: 1960 sportwin 10 hp

The sticker on the boat say's it is rated for a 6hp. Do you think a 18hp will be to much?

 

[alcan]

Re: 1960 sportwin 10 hp

Hi Sctrr<br /> This sounds like the roller that follows the cam is missing. There should be a roller attached to the linkage above the carb. This roller rides a cam that is attached to the timer base, which rotates via the throtle control arm (tiller). If the roller is not missing, then you will need to adjust the cam. This procedure is called a link and sync. You should have a manual handy to get this right. You my also have an ignition problem. Do you have good spark to both holes? A 10hp motor on a 12ft boat should be kind of scarry, that's my opinion.

 

[sctrr1]

Re: 1960 sportwin 10 hp

I checked the follower and it is in good shape.It contacts the metal plate were there is a line on it and rides on the plate until the end of the plate. The follwer is wedged between the plate and the motor.Should it contact the plate before the mark? I agree with you this thing should fly.

 

[slow_boat]

Re: 1960 sportwin 10 hp

The center of the follower roller should align up with the engraved line at the very instant the butterfly (throttle) shaft begins to move. Fashion a short piece of stiff wire into an alligator clamp, clip this to the throttle rod, and turn the throttle grip slowly until you detect movement in your wire contraption. The line should be directly on the center of the roller @ this point. If not, get a manual & set the timing. Even if the timing is off you should be able to get the butterfly wide open if the throttle linkage is connected correctly at the twist grip.<br /><br />FWIW, my '57 fastwin will plane my 14' aluminum boat with one person on board but just barely.

 

[alcan]

Re: 1960 sportwin 10 hp

Ok, That sounds pretty good. The roller should just start to contact the cam at the mark. Actually the throtle plate should just begin to open at the mark. This word "wedged" bothers me. And the follower is a roller, correct? When you reinstalled the carb did you get the levers with the set screws and "D" slots put back correctly? If so, and you still can't get full throtle at full advance (timer all the way advanced). Then you may need to loosen the cam retaining bolts/cap screws and move the cam outward until you get full throtle. It is a little unusual for this to be out of adjustment like this, (how ever possible). The cam will angle so you will be able to maintain the pick-up mark. You never did say about you spark. How do your coils look? Are you sure you firing on both holes?

 

[steelespike]

Re: 1960 sportwin 10 hp

There is no question the 10 will plane that boat.<br /> If you are 200 lbs and the tank is in the back of the boat and the motor is trimmed out it will be tough to plane.Trim in, move the tank and other weight forward.If the boat is a real small 12 footer it might have trouble getting the weight up.<br /> When I was a kid we had a 10 Johnson on a 14ft<br />Crestlener utility It took some doing but it <br />would plane with 2 of us kids on the back seat<br /> About 200 lbs. It topped out at between 19 and 21 mph.

 

[sctrr1]

Re: 1960 sportwin 10 hp

I took the boat to the lake today but the water was to choppy to get the boat out so i ran it at the dock. I started the motor let it warm up and ran it in forward wide open. While it was wide open i opened the butterfly valve on the carb wide open with my finger. It hade no affect. While i held it open i tried richining and leaning the carb and got no more improvement.I also noticed a 20 stamped on the head so i am assuming that the motor was rebuilt with 20 over pistons. I use to race 2 stroke dirt bikes when i was younger and we would have the head shaved to increase power and put in new reed valves and jet the carb doeas that same principal apply to boat motors? Will this help or would it be to costly should i work with this one or go up to a 18 or 20 hp. A used 20 around here would run approx. $700.

 

[alcan]

Re: 1960 sportwin 10 hp

My opinion is that 10hp is more than enough to plain your 12ft boat with any load it will safely haul. It sounds to me like you just have a minor adjustment problem. Maybe the timer plate is not rotating to full advance. If not, all the throtle in the world won't help. Are you adjusting the needle valves with the linkages disconnected? Don't give so easy, this is a simple little problem. I doubt that stamp on the head has anything to do with bore size.

 

[OBJ]

Re: 1960 sportwin 10 hp

I agree with alcan. The 5.5 and 10 horsepower motors are great little engines when they are properly set up. If unsure of what to do next, beg, bum or borrow a manual and get the engine tuned in right. You won't be sorry you did!