Question about Poulan 38-Inch Steel Deck 15.5 HP Briggs & Stratton I/C Engine With 5 Speed

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15.5 ohv briggs and stratton

After motor gets hot engine will only run in idle speed and i cannot engage belt drive to cut the grass and when i apply gas to motor it wants to die unless i go back to idle speed i am burning no oil but suspect head gasket might be bad.

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It could be "starving" for gas, not getting enough gas. Check the plug, if it is white then the engine is running to lean and will overheat. If this is the problem, then the carbertor will have to be adjusted, and or cleaned, or replaced.

Posted on Jun 24, 2009

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It appears that you have a slight mis-adjustment in the idle speed and idle mixture. To adjust setup, start with at least a half tank of fuel, and have engine at operating temperature (That is warm but not overly Hot). The Briggs & Stratton Website manuals section should show the locations of the adjusting screws if you are not sure of them.
To adjust idle speed set Throttle control to minimum and adjust screw on throttle butterfly to maintain a good idle speed. To adjust idle mixture, screw in idle mixture screw (Lean) until motor falters and then screw out (Rich) until it falters again. Correct setting is the halfway point of these two positions. You may have to re-adjust idle speed again and also the mixture to get best running.
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