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25hp 2 stroke not idling

Engine starts ok but does not run any length of time then splutters and stops.

When put in gear and revved up it sometimes loses power and stops.

Have had the carbs off twice, cleaned out jets with fresh fuel and compressed air. Did find some water in the fuel bowl but not much dirt, now looks ok.

Was some dirt and water in the fuel filter but have cleaned and dried out several times.

Did find some dirt and water in the bottom of the fuel tank, so completely drained, cleaned and dried the tank and filled with fresh fuel, still no better.

Any ideas on what else I can try?
 
Year/model?
The low speed air screw might need to be adjusted?
Set at 1 and 1/2 turn out for inital adjustment then after it's warm you adjust.
 
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