94 merc 25 throttle ?

Discussion in 'Outboard Maintenance' started by bartbarry, Sep 10, 2012.

  1. bartbarry

    bartbarry I Love microskiff.com!

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    I have circled the throttle lever in the pic below...my question is this, Is the plastic bushing that rides in the slot SUPPOSED to be flat on one side? looks like wear.but I'm not sure. I'm having issues getting the motor to start without forcing the throttle open. I also cant get it to hold a proper idle. Wide open runs fine, Seems like a low end range issue, it just settles down and then starves out.
    [​IMG]
     
  2. Brett

    Brett > PRO STAFF <

    No idea if it's supposed to have a flat spot.  :-/

    But as long as the fit is snug in the slot, I'd leave it alone.
    Problems maintaining idle usually indicate dirt in the carb on my outboards.
    Check to see if the plugs are showing black and wet.
    Indicates too much fuel entering the firing chamber at low rpms.
    If dry and tan then fuel starvation is taking place at low rpms.
     

  3. bartbarry

    bartbarry I Love microskiff.com!

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    Carb is freshly cleaned and rebuilt, no change in the problem. As for "snug" :-/ ... there is a good amount of slop in the linkage,but has been like that since I got the motor,and it ran great for the first year, this issue has come on slowly and I was keeping it at bay by adjusting the linkage and tweeking the idle...I'm over it and want to get to the root of the problem. I'll check the plugs again, they are new and have never seen much run time other than in the driveway while running in the water tank, no real "use".

    One other thing, Mine doesnt have a carb cover,never did. Could that pose an airflow issue? I know my neighbors generator WILL NOT run without the carb cover on.
     
  4. Brett

    Brett > PRO STAFF <

    I think your outboards just in need of a tune up.
    If you're sure the carbs clean, then I'd be checking my plugs
    and checking my carb linkage and throttle synchronization.
    Verify idle rpms in water with engine in forward gear.
    Not on hose flush, important to set idle rpms to compensate for
    back pressure created by water level in exhaust housing.
     
  5. DuckNut

    DuckNut Brandon, FL

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    You mention that the carb is clean and rebuilt. One thing you did not mention was if you had the volume of the jets checked.
     
  6. anytide

    anytide Administrator Staff Member

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  7. bartbarry

    bartbarry I Love microskiff.com!

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    Carb is clean, plugs are new. I'm at the point of trying to sync the throttle linkage. I know it needs to be done in the water...also, my outboard does not have a carb cover. could this be an issue as well. It never had one since I got it and it ran fine for a while...I think the mech just had it tweaked to run,but not "set correctly" :(
     
  8. Brett

    Brett > PRO STAFF <

    Many of the older carbed 2 strokes didn't have the intake baffle.
    I think it was meant to be a venturi noise suppressor.
    Kept intake whistle down to a whisper.
     
  9. anytide

    anytide Administrator Staff Member

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    did you clean the idle jets?
     
  10. bartbarry

    bartbarry I Love microskiff.com!

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    Not really sure. This was my first venture into the carb, i'm not that familiar with the idle jets and no, I don't have a manual :-[
     
  11. Creek Runner

    Creek Runner Well-Known Member

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    Your motor doesn't have a carb cover from the factory. If your talking about the roller cam on the lnkage no it should not have a flat spot, but that wouldn't casue your problem.

    You can't say the carb is clean and recently rebuilt if you don't even know if you cleaned the idle jets.

    Take it into te shop spend the 1.5 hours of labor and get it fixed.
     
  12. bartbarry

    bartbarry I Love microskiff.com!

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    Yup thats about where I'm at...really thought I could do it myself but I just don't really have the time or knowledge.