70 evinrude problems

[scothorn]

Ok I'll try to make this as short as possible. My father and I share a boat, 17ft tracker 70 evinrude, Pretty sure it's a 90 model. Anyway, he was having some problems and had it serviced, carbs cleaned /rebuilt about a year ago. He said it ran fine afterwards. The boat has set a lot in the garage since then, only used about 4 times a year till I got it. The engine starts normal(easy) comes out and on plane quickly, but when you are going around say 25 and throttle down it starts bogging like it's not getting enough fuel, when you let off sometimes it normalizes, some times it won't. I changed the lines, ball, and filter and put a can of seafoam in it and took it back to the lake today. Seemed good as usual, but after i throttled down at 25-28 mph it bogged again. I stopped, took it out of gear and throttled up a couple of times, put it back in gear and took off again. It came out on plane fast as usual, no bogging at all, ran fine at 25-28, throttled down and acted up again. I repeated this process a few times. I did't have a ton of time so I had to go. When I let my wife out to go get the trailer I took it back out for a few rounds, and it seemed to be getting better and bogging less. Do you think it''s the seafoam starting to work? Or maybe VRO problems?Possibly carbs? Help! Thanks,
Scott

 

[scothorn]

Re: 70 evinrude problems

I should add it also had the original gas tank on it, metal Rust/corroded, which I also swiched when I switched the other things. also, I only switched the main lines, not the lines from the VRO to the carbs

 

[rickdb1boat]

Re: 70 evinrude problems

So are you saying that when you let up(Throttle down) on the throttle, it bogs down? Or when you give it more throttle it bogs down? It may be that the Seafoam is breaking up some stuff in the carbs, but if it doesn't get better, I would tear the carbs down and clean them. Last thing you want is for one cylinder to run lean. Especially since it was used so little in the past year or so. They tend to gum up..Might have some crud in there from the old fuel tank too...Next time you are out, try pushing the key switch in (Primer) and see if it picks up. If so, carbs are clogged most likely..

BTW- I have the same motor in the 91' version..

 

[scothorn]

Re: 70 evinrude problems

I'm sorry, yes when you throttle up, when I said down I meant pushing the throttle lever down. And as you mention it, My father said he had to push the choke in once to get it to run right before. So carbs?

 

[scothorn]

Re: 70 evinrude problems

choke/primer I mean

 

[scothorn]

Re: 70 evinrude problems

Oh also before I replaced everything, the other day on the lake it was Bogging down, really bad I was throttled up75 % and only barely on plane, all of a sudden, it surged then died, and the warning buzzer sounded. I was only 200 yards or so from the dock so I trolled in. When I went to load I figured I would turn the key on to see if it still buzzed, It didn't, started fine so I loaded with the motor. Any thoughts?

 

[jtexas]

Re: 70 evinrude problems

If you ran it with a rusty tank even just a little, and now it bogs down on acceleration, I'd be willing to bet you've got tiny little particles in your carb(s). Don't ask me how I know. 8) Don't think the Seafoam can do anything about foreign matter blockages.

If you didn't do this before, drain the carb bowls and pump the primer bulb with the drain plugs out to flush 'em out (might have to do one at a time). Might not do any good...but what the heck. While you've got 'em out, look at the ends of the screw plugs...if the carb is varnished, they will be too.

Here's another trick, it's a long shot, something I learned last weekend...rebuilt my carbs due to bad idle, afterwards I had good idle but bogging at hi-speed (new problem). I took out the screw plugs and gave the hi-speed orfices a few blasts with a spray can of b-12. Cleared it out. Keep in mind that won't help with varnish. Would've rather used deep creep but all I had was the b-12.

 

[scothorn]

Re: 70 evinrude problems

ok will do thx, By the way what is deep creep and where do I get some?

 

[jtexas]

Re: 70 evinrude problems

deep creep = seafoam in a spray can. They carry it at my local Autozone, I've heard napa has it too.

 

[rickdb1boat]

Re: 70 evinrude problems

And you might ask Dad when the last time the waterpump was serviced. If more than a couple of years ago, it's due. That warning horn you heard is for overheat if it was a solid tone...And as a side note, an outboard that sits too long is trouble waiting to happen. Rubber parts dry out (Waterpump impeller, Seals, Etc) and fuel passages get clogged. Once you get it going, try to run it at least once a month and winterize it properly before you lay it up for winter and it will serve you well and cost alot less to maintain...

 

[scothorn]

Re: 70 evinrude problems

I've told him that, he is stubborn, and mumbles something about my uncles boat and motor not being serviced regularly and it runs fine. My reply, My uncle uses his boat every other week! And he needs to service his too! oh well I'm trying, I usually end up fixing things only to have to fix them again. That's why I'm looking for my own boat. Thanks Rick I really appreciate your and others input greatly.
Scott

 

[fireman57]

Re: 70 evinrude problems

When it bogs have someone watch with the cover off and make sure that the timer base isn't sticking. If it sits a lot any oil or grease will get thicker and won't let it spin as free as it should. you can probably do this with the engine not running.