1963 evinrude 10hp sportwin need help

[63evinrude10hp]

ok guys, i need some help, i know mechanics very well, iam very skilled in auto, boats uhhhh little bit, know the basics of internal combustion. i have a 63 10hp sportwin, i need alot of suggestions, the guy before me put all new electric in it IE coil, points etc.. now my problem, it seems like when its off water, hooked up to hose for water, it runs pretty good, if i play with mixture screws but a little tempermental, now i put in water, under a load, and it runs ok but at full throttle it seems like half throttle, out of water it idles just fine, in water it dies, i have to start it in gear at half throttle, i just need some suggestions on what to do, its winter here, and want to do it right this time, so i dont miss so much fishing timr, by using my 30lb thrust electric motor on my 12 ft v hull alum boat!!! i seen it run top throttle once, for like 10 seconds, it was fast!!!!! but i dunno i stumped, it runs great out of water, in water it seems to be under a load not as much power, has good compression, new plugs old wires????????? new coil, points condensers, the wires for plugs are old though. ant suggestions?

 

[SeaKaye12]

Re: 1963 evinrude 10hp sportwin need help

Well...I can predict what a lot of the replies to this thread are going to center around. Three things actually.

(1) Compression. Have you tested it? Both cylinders should give readings within 10% of each other. Without good even compression everything else is not going to achieve much.

(2) Spark. It kinda sounds like you're running on one cylinder. Take a look at the plugs...and/or hook up a spark checker. Probably you'll end up replacing those wires that you put all those ?????? marks after

(3) Fuel. If you haven't already checked/cleaned/rebuilt the carburetor...now's the time. It doesn't take much $$$ or skill to do that.

OK...I'll sit back now and wait to see what the real experts have to say.

Good Luck, Chuck

 

[1946Zephyr]

Re: 1963 evinrude 10hp sportwin need help

Yep, i agree with the above. Check the gap on your points. Sometimes they can close up on ya, after a trial run. Then do a spark test.

 

[kfa4303]

Re: 1963 evinrude 10hp sportwin need help

Ditto. Also you can't run that motor on muffs! If must be run in a test tank with water up to a few inches below the main exhaust port. Here's a link that can walk you through a complete tune up. It's for a Johnson, but it's essentially the same as your e-rude.

http://www.sschapterpsa.com/ramblings/johnson_QD.htm

 

[F_R]

Re: 1963 evinrude 10hp sportwin need help

Guaranteed it is running on one cylinder. Now it's up to you to find out why. Shouldn't be hard for an experienced auto mechanic. Almost guaranteed it is an ignition problem, but check compression first. Other possibilities are: Could be the fuel pump diaphragm is holed and squirting raw gas into the missing cylinder. Last possibility is water ingestion into the missng cylinder. It is NOT the carburetor!!!! The carburetor feeds both cylinders equally.

 

[kbait]

Re: 1963 evinrude 10hp sportwin need help

Consistent, 1/4" snappy-blue bolt from both leads w/a tester is required. (If you get that, make sure you have good plugs..J6C's at .030") Still running on one, then compression/water intrusion/fuel pump checks F R mentions (agree that your carb sounds fine).

If you can manipulate your flushing device so water comes out w/exhaust when testing.. Good job! I always run 'em in a barrel, as my cheap, round-cupped flusher would never work... unless I sliced the hose-end cup to fit along the cav. plate so it could surround and seal the intake plate.. hmmm...

 

[kfa4303]

Re: 1963 evinrude 10hp sportwin need help

I agree that you're probably only running on one cylinder, which these old motors do surprisingly well. Here are some links that can walk you through an entire ignition rebuild, carb rebuild and general maintenance. It's a very simple job and you can get a "tune up kit" (points and condensers) right here at iboats for about $20. I would also replace the spark plug wires too while you're at it. You'll need 7mm, copper core wires. They're available at some auto parts stores. I've had luck with Car quest and NAPA. They usually sell it for about $2-$3 a foot. You'll only need 6 ft. or so. No sense in getting a nice fresh ignition system only to use the same old crusty wires. If you do replace them, be sure you TWIST the new wires on to the posts of the coils, rather than just poking them on there. You don't need any special too except a flywheel puller and a feeler gauge. Keep us posted. Holler if you get stuck.

http://www.duckworksmagazine.com/06/columns/max/index6.htm

http://forums.iboats.com/showthread.php?t=158086

http://www.outboard-boat-motor-repa...on 3 HP 1952-1967 Ignition System Tune-up.htm

http://www.outboard-boat-motor-repa...hnson 5.5 HP 1954-1964 Carburetor Tune-UP.htm

 

[63evinrude10hp]

Re: 1963 evinrude 10hp sportwin need help

Yea, i agree i rebuilt the carb w/ a rebuild kit thats easy stuff for me, not carb... Now i tested compression shes all good in 1 and 2, now there was a plug wire pulled of a coil, it was running on one cyliner, i reattached it, thats when it ran fine out of water( when i first got it for free, it was a Nightmare) But i built a Muff i made a adapter plate,i take off stock water plate above cavitation plate, Then i put in my plate (only for out of water tests) and i made the plate with a threaded hole, then a adapter for my hose that screws into the plate. Ok now that its not compression, not carb, i gonna pull everything off and just start over again, spend a whole day on this sucker, making sure points arer at .020, plugs .30, good coils, condensers, fuel pump,etc.. I asked a so called boat expert here at home, he just said, oh its expected these older motors are just finicky, theres nothing we can do about it. Being a ASE Mech, i know better, no motor is like that, yes there finicky but there is always something that could be done. I would like to say thanks guys for everything on my post. ant more suggestions are more than welcome.....

 

[63evinrude10hp]

Re: 1963 evinrude 10hp sportwin need help

I also built a Puller also, i fabricated a 1/2 inch steel plate, and drilled and tapped the bolt holes, works great, i got almost every tool known to man, but not a puller, i have a Three jawed puller, but i didnt wanna hurt the soft aluminum wheel, but thanks guys for everything for all the help!!!!!!!!!!!!!

 

[F_R]

Re: 1963 evinrude 10hp sportwin need help

TEST that sucker for running on one cylinder!!!!! All you have to do is ground the plug wires one at a time. But you already know that. If it isn't ignition and isn't compression, that leaves the more sneaky stuff I mentioned. My money is on ignition. You car mechanics get stumped by two-strokes. But that's ok because I'm an outboard mechanic and I get stumped by cars. I gotta tell you that outboards certainly are easier to work on.

 

[kfa4303]

Re: 1963 evinrude 10hp sportwin need help

I agree with F_R. Don't listen to the guy who said "they're just finicky", BS!!!! It's just the opposite. The old universal magneto systems are dead simple and I dare say every bit as reliable, and certainly easier to diagnose and fix, than modern, black-box computerized motors. Use the links in my previous posts and you'll have her put back together in no time. Once you do it once you'll wonder why all motors aren't that way. You should be able to get a flywheel puller at most auto parts stores for about $15-20. Be sure to get 1/4" x 20 x 3" GRADE 8 bolts and washers. The ones that come with the puller are not strong enough for this application. A strap wrench is handy for holding the flywheel too. Don't be alarmed when the flywheel comes free. It may make a loud "Bang", but that's normal. To help prevent the flywheel from, well flying off, Leave the flywheel nut on after you've loosened it initially. Good luck. Holler if you get stuck.

 

[63evinrude10hp]

Re: 1963 evinrude 10hp sportwin need help

Hey, Thanks guys for everything, and you are right, all my schooling, and yrs of auto experience, i can diagnose and fix almost anything with 4 strokes in it!!!!!! but two strokes..... i think like a 4 man and try to use 4 stroke tactics on 2 strokes, lol i agree its the ignition , i just gonna take it all down ohm everything and do it step by step, Thanks guys, you all have been more than helpfull

 

[samo_ott]

Re: 1963 evinrude 10hp sportwin need help

It's running on one cylinder! But you know that by now. And 2 strokes are easy! Way less moving parts to worry about! And once it's running it's be more reliable than a modern engine in my opinion. And way easier to fix if ti does break down on a desert island!

 

[kfa4303]

Re: 1963 evinrude 10hp sportwin need help

yup. these old gems are purely mechanical and simple as can be. I'm 90% sure I could rebuild my motor on the water with some bubble gum and a paperclip, if I had to, and I 'm really, really dumb. I love starting my motor with one pull at the dock as I laugh quietly at the guy with the $50k batmobile, bass boat who can't seem to start his to save his life. Less is more. 2 strokes rule. Good luck!