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  1. #1
    Lieutenant scoutabout's Avatar
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    Default Blue smoke out of a Yamaha 4 stroke?

    Any input on this mystery is appreciated. I've got a 2004 Yamaha 90 4 stroke purchased last year with 24 hours on it.

    We've put about 60 hours on it this season and I've noticed the idle getting progressively lumpy over the summer. In neutral at the dock it stumbles a little like it's missing slightly. Warm, it idles at about 600 rpm but has me reaching for the throttle as it sounds like it's going to stall. Despite this it has run fine at all speeds above idle.

    Last week, the day after a particularly long cruise (for me) of 50 miles, it started with a fairly large cloud of blue smoke and idled very rough as well as ran rough in gear at dead slow. Blue smoke out of a low hour engine that's not supposed to burn oil has me twitchy to say the least...

    Any ideas or a list of usual suspects to check on the idle and smoke issue? Are they connected? This is my first full season with a Yamaha and I've come across other threads where people say they should be run with additives like Stabil all season to keep the carbs from gumming up. Can it be expected that the carbs would need adjustment or go out of synch in one season?

    All thoughts appreciated.

  2. #2
    Supreme Mariner
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    Default Re: Blue smoke out of a Yamaha 4 stroke?

    if left tilted down blue smoke at start up is normal. oil tends to run downhil past the rings and will collect in the combustion chamber.
    the rough running will be most likly a carb issue and I think it should idle closer to 750 or so, but I cant remember the exact number. may be time for a trip to a dealer for a leakdown test,a decarb and check the throttle linkage.
    make sure the dealer has a leakdown tester and a techmate or equivalent.

  3. #3
    Lieutenant scoutabout's Avatar
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    Default Re: Blue smoke out of a Yamaha 4 stroke?

    thanks rodbolt -- I've made the appointment. My lake has no official dealers and only one marina but I think the exercise of trailering it an hour to a pro every once in a while will be worth it.

    Cheers,

  4. #4
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    Default Re: Blue smoke out of a Yamaha 4 stroke?

    just make sure they have the proper test equipment I mentioned and the 4 stroke school certificate on the wall. if not run away.

  5. #5
    Lieutenant scoutabout's Avatar
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    Default Re: Blue smoke out of a Yamaha 4 stroke?

    Quote Originally Posted by rodbolt View Post
    just make sure they have the proper test equipment I mentioned and the 4 stroke school certificate on the wall. if not run away.
    Are there not minimum training requirements a Yamaha dealer must meet, especially since 4 strokes make up so much of the new outboards up here these days?

    All I see here is that they are a 5 Star Dealer. Does that mean anything?

    http://www.paynemarine.com/service_dept.html

  6. #6
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    Default Re: Blue smoke out of a Yamaha 4 stroke?

    is 5 star meaningless? no. means they watched a 20 minute video.
    no there are no standards just like in the american auto industry.
    ya got a set of wrenches and u b a techynitian.
    I wish there were minimum profeciency standards in my industry. would weed out a lot of crap dealers and techs.
    however best the consumer can do is look at the yamaha web site under school certs and find a dealer that trains techs not monkeys.

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