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I fired up the motors today to get ready for the season and one of the motors was smoking and spitting oil out the exhaust along with the water and grey smoke. I tried to increase the rpms but it would onlr reach 2800 then stall? The motors are 1987 Yamaha 70 ,ETLH,2 stroke. I think it has something to do with the choke,mabey its sticking? What the next step. Thanks.

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I would spray some carb cleaner in it and see if that will clear it up. Follow the instructions carefully so as not to damage anything or cause a backfire

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How long did you have the engine running for overall?

Also, check your fuel lines, primer bulb, etc for air leaks (pre pump) as air in the fuel makes the VRO pump inject much more than its normal pace.

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certainly sounds like a carb problem to me too.....but not sure why so much oil is coming out. Definitely clean the heck out of your carbs though.

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air in the lines is possible,I re-routed the fuel lines,Ill try cleaning the carbs with cleaner,the motor will keep running as long as I dont raise the rpms too hige,then it stalls
thanks for the suggestions,Jerry

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I always wonered if you guys up North have to do any kind of un winterizing to the engines after they have been fogged? could this be part of the problem??? BG

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If you used fogging oil to winterize the motor it could take a little bit to get that out of the motor. Also could be water in the lines, and if you try some dry gas in the fuel this could help. I have had similar problems in the spring and is usually based on getting the winter "gunk" out. Good Luck

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for de-winterizing, I just fire up on the old plugs, (engine was fogged, so start up is easy) then run for a while, then pop in fresh plug's, that's it, total cost for the year- a few spark plugs, she's a tad smokey at start up (normal), clear's right up, engine was protected all winter, job done ! it's the easiest thing to do before putting the boat away, "Fog & Flush", always start with "FRESH" fuel, the old stuff (even w/ fuel preserver) is now for the lawn mower, if that "Blows" I can pick up another one out of somebody's garbage, can't do that w/ the O/B.

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DO NOT spray carb cleaner in the carbs. For one, it DOES NOTHING, except make more smoke. On top, it washes down your cylinders and CAN cause scoring. Get rid of that stuff.

Many questions here:

1. What kind of oil?

2. Gear lube, ouboard powerhead lube?

3. Any fuel leaks? Carbs leaking?

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OK,the oil comming out I believe is VRO oil,unfortunately the fuel is over a year old(full tank-63 gallons!),that said, the port motor runs fine with the same fuel?,and no I dont see any carb /fuel leaks. Confusing thing is I fired the motors up last fall before I winterized them and they worked fine? Thanks for the input.

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I can appreciate your aggravation due to the fact they ran fine last year, however, with two strokes there are gremlins that sometimes play tricks. Anyway I would not get to excited because if it ran fine last year it will most likely be something simple but keep in mind that things freeze, causing them to warp and or crack over the winter. If it is sucking air there is a trick you can try, be very careful, it does work. With the engine running, take a propane torch do not light it but just open the valve abit. run the nozzle around carbs and or lines if the engine smooths or idles faster then there is most likely an air leak but be careful not to get a false reading from propane getting sucked into air cleaner. As a side note this works great on finding leaking fuel injecters or fuel rails. It won't take alot of propane so don't spend alot of time blowing propane.

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If you think about how the oil injection system works, it's metered in proportion to the fuel. So if all was correct there, and you're getting lots of oil out the exhaust, you'd also be seeing that much more fuel, which it doesn't sound like you are.

Since you say it didn't happen in the fall, and I assume you re-routed the fuel lines since then, a air leak could be your issue. If it were me, I'd disconnect the fuel line to the engine and run a short (known good) line from a portable tank. Or you can even swap lines with the other motor as you say that one's fine. Try and bypass the current fuel lines and see if that doesn't solve the problem.

Keep in mind, there's a lot of oil in the cyl's now, so you'll have to run for a bit to burn it off. And a plug cleaning now might be a good idea to help it run better when you next start it.

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I should clarify my statements. I bought the bought last fall and started the motors just to winterize them. So when I say they ran last season,thats what I mean. I will try the propane trick ,clean up the plugs and also try switching the lines. Ill also let the motors run for a while to see if it is just something that needs to burn off.
Thanks again.Jerry

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Jerry,
Did you pull the plugs? Do they all look the same?
Mike

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all identical,with what seems to be possibly a mixture of oil and gas?

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Did you try fresh plugs?

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nope,I planned on dewinterizing the motors then putting in the new plugs, I dont think the plugs are the issue,I also swapped the ones from the motor that was working fine and they made no difference? Thanks for the suggestions.

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You'd be surprised about the performance issues of a spark plug. I've used plugs that look perfectly normal to the naked eye but when they are put under a load and used at higher RPMs, they break down and didn't work as they should have. I would take the advise of the other guys and put in new plugs and then take it for a ride and see what happens. I tend to agree, replace the plugs.

Good luck.

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A friend spoke to his friend @ yamaha and he said it sounded like the carbs could be gummed up? If cleaning the carbs dosent work then Ill try the propane,then plugs.
Again thanks for all the advice. Jerry

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I would Re-Inspect the fuel lines as well, you're going to need new plugs anyway.

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Stop towing fat chicks on skis! Words to live by

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huh?

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Sounds like a can of Sea Foam wouldn't hurt.

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i cant find sea foam locally,who makes it?

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You can buy Sea Foam from O'reillys, Pep boys, NAPA, Parts plus etc. Here's the website for SeaFoam

http://www.seafoamsales.com/buy.htmom/buy.htm

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Keep in mind that it's going to take some time for the sea foam to travel up the fuel line and make it to the carbs at idle, esp depending on the set up, and with a poor running engine that can be difficult.

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well I went to Pep Boys and picked up a can of Sea Foam,got home ,started the troubled (port)motor and viola, it ran fine,I didnt even need the sea foam! I guess the motor was gummed up and saw the can of sea foam and decided to work. Thanks for the advice this sea foam works better than I thought!:o
Jerry

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It's a miracle product, no doubt! Really, if you use it according to mixing directions it can really help keep those carbs clean. I had a rough idle and used it and after 18 gallons the idle smoothed out, or at least seemed to. Keep us posted on your progress with the engine.
Mike

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Maybe the gas from running the motor sitting in the carbs and other areas for several days acted as a solvent.

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You'd be surprised about the performance issues of a spark plug. I've used plugs that look perfectly normal to the naked eye but when they are put under a load and used at higher RPMs, they break down and didn't work as they should have. I would take the advise of the other guys and put in new plugs and then take it for a ride and see what happens. I tend to agree, replace the plugs.

Good luck.
I gotta say this is dead on. Do yourself a favor even with it running right, do the seafoam treatment now on the old plugs and then swap for new. Made a big difference in my 88 SPL

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"Sea Foam" or "Carbon Guard"/"Ring free" is a "MUST" for the crummy fuel we now are using in our EXPENSIVE engines. I use it EVERY time I top off.