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25hp Merc that wont troll

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Well I did it! I left gas in the tank this winter and now am paying for it! I have a 94 25hp merc. I put new gas and oil in the tank with seafoam and new plugs. The engine will run fine at higher RPMs however when I troll it down, it dies When I put it in reverse it dies right away. I can keep it running by pulling the choke out and pushing it back in, but after about ten minutes that gets old!. Any suggestions as to what to try next! Thanks! An Armchair Mechanic

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The symptoms are correct, that's dirty carb problem. You can try to run motor with heavy concentration of Seafoam for a while, it might fix it, or you have to disassemble carb, clean it and re-assemble, and while is open rebuild it.
If you find an honest shop, it shouldn't take much money and time, problem is they are all very busy lately.

Val

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Be sure to pop off the sediment bowl, as well as the screens to be sure you don't have suspended rust flakes in the system. Do this several times until you see no contamination or scum on the fuel screen. Take a good look at your fuel tanks too, they may be flaking inside and need of replacment?

You may need to back flush the whole system if you see rust? Be careful not to too use high of air pressure if you blow out the carb. Take it cool or you may do more damage then good.

“Sea-Foam” is a very good plan. Run it in your tanks for the next few months and be sure to winterize it properly this winter.

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Please also consider that the seafoam will change your mixture and octane rating in the tank. If the octane rating/oil mixture is different than normal the idle speed is the first thing that will be affected. You can compensate for different mixtures a little by adjusting the low speed mix screw on the carburator, but since you're not going to run seafoam in the tank all the time..........try the simple thing first. Try using gas without the seafoam. Do a visual chack of the sediment bowl and screens for rust first just to make sure.....but I would be surprised if the problem with idle was anything other than a mixture problem due to the seafoam.

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[This message has been edited by wastewaterguru (edited 05-28-2002).]

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