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I Love microskiff.com!
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Discussion Starter #1
I have a 2004 Merc 25hp , 2-stroke . My problem has been with this engine since I bought it new . It will start fine , idle fine and run 1/2 throttle fine and that it !  The rpms will not go any higher than about 50% . The throttle is open wide , carb throttle is also open all the way , carb was just  rebuilt , new pump bulb for fuel tank , cleaned the carb filter & fuel tank filter . New spark plugs installed . Fuel tank connections are all good and tight . Coils are fine as well .
I only used this engine maybe 15 gallons over the last 6 years . I bought it new and didn't run really well to me at that time . Just figured it needed time to break in .
I did use new 2 stroke oil in the fuel along with Sta-bil Marine .
The one and only time it ran full rpms was last month for about 1 mins then started dying at full throttle . Then I would take out of gear and it would start right back up no problem . This went on for about 20 mins or so untill it got to the point of not starting at all .
After a crb rebuild it seemed to run ok but only at about 50% of the rpms it should be running at full throttle .
Right now it will start and run just fine BUT will only rear 50% of the rpms the engine has .
I am starting to wonder if the "reeds" were bad from the beginning . That is the only thing I can think that might be causing this problem .

PLEASE HELP !

Jim
 

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> PRO STAFF <
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7,519 Posts
I had an outboard that no matter what I did, it wouldn't produce full rpms.
I knew compression was good, spark was good, fuel pump was good, intake vacuum was good,
I finally just replaced the entire carburetor with a new one, solved my problem.
 

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Brandon, FL
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10,682 Posts
Do as Brett said or try to find someone who has a set of carb jet bits and have them clean and check the jets.
 

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Stripper in my own Mind!
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2,537 Posts
Had the same issue on a Yamaha. Replaced endless parts. Do as Brett said and just buy a new carb. That's the problem altogether...
 

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Boozle on...
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859 Posts
I have the same exact engine, that had the same problem. I replaced the pick up tube in the tank and all the fuel lines and bulb, cleaned the carb a little and she has ran perfect ever since. I didn't have to buy a new carb, maybe you don't either.
 
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