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Author Topic:   1989 70hp yamaha outboard
RICK CATFISH posted 08-27-2004 01:27 AM ET (US)   Profile for RICK CATFISH   Send Email to RICK CATFISH  
PLEASE HELP: I am running the above on a 15' SD80 Skeeter Bass Boat. (came with the boat) I bought it brand new in 89. "DUUUHHHHH"

Everytime I launch or have had the boat in the water just trolling with my trolling motor for say, anywhere from 3 minutes to 3 hours I have to raise the idle arm all the way up and sit there for a good solid 30 seconds to 60 seconds waiting for the motor to quit spitting and sputtering (I'm not exagerating on this one guys) very very very very violently and until it finally seems to idle up like it should and then we can hit the throttle all the way down and scoot on down the Red River in Shreveport, Louisiana. I have drained any condensation out of the floats, put a new bulb and hose assembly from my gas tank to my motor.
My motor also starts fogging up the air with oil smoke all around us just before the idle kicks in and starts running like it should. Is there a fuel filter other than the bulb located on this motor that I can change out or can I adjust the timing or do you think the gas mixture screws on the side of the carbs need adjusting? I am out of ideas.
You can email me at "" if you would like. I'll try almost anything right now.

Thanks so much,

jimh posted 08-27-2004 09:07 AM ET (US)     Profile for jimh  Send Email to jimh     
I was going to delete this...but had second thoughts.

Any ideas to help this guy? Other than get a new Whaler?

Peter posted 08-27-2004 09:27 AM ET (US)     Profile for Peter  Send Email to Peter     
Ok, I'll give it a guess. Besides putting this motor on a Whaler hull, it sounds like the motor could use something like a sync & link check. A sync & link makes sure that all the throttle butterflies are synchronized. If all of them are not closing all the way at idle speed, it will not idle right. That's just one of several possibilities but its a simple check that a mechanic can do in less than 30 minutes.
15ftlover posted 08-27-2004 09:46 AM ET (US)     Profile for 15ftlover  Send Email to 15ftlover     
May want to use some carb cleaner or techcron if you've never done that. Also consider de-carbing the engine if it's an '89 hasn't been done
Bigshot posted 08-27-2004 01:19 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Techron never hurts but before you adjust ANYTHING hook up a portable 6 gal tank and use that o make sure gas supply is clean and free of water. There is a small fuel filter on the port side of engine, drain and clean. Change plugs and try again. Look at old plugs as well. If plug or plugs are really clean, then you are ingesting water which is the cause of the rough idle, the cleaning of your plugs, and mist in the air. I have seen MANY a Yamaha get a pinhole in the water jacket which allows water into a cyl or more than one cyl. This is usually corrected with a new/used head(e-bay?). If the internal jacket is leaking and head is still good, you may be able to JB weld it for another couple seasons. NOT adjust anything, especially when she runs good after you clear out the engine witha fast idle.

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