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Yesterday I cranked the old mower which I had tuned up by a professional just over a year ago and when it warmed up it ran poorly and would hunt and surge when running more than idle.

The fuel tank at that time was very low so I topped it off with fresh fuel and basically had no effect. I had a similar problem last year at which I could get a bit better performance by pulling on the choke, but this time that make nearly no difference.

Do I have to take it back to the pros or is there something that I can do? I heard this model has no mixture screws to check/adjust. The unit has a 19.5 Briggs & Stratton V-twin engine.

Thanks!
 

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Every time you buy gas for your mower put Stabil in it and use it year around. This problem will not happen next year. Roger
 

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Yesterday I cranked the old mower which I had tuned up by a professional just over a year ago and when it warmed up it ran poorly and would hunt and surge when running more than idle.

The fuel tank at that time was very low so I topped it off with fresh fuel and basically had no effect. I had a similar problem last year at which I could get a bit better performance by pulling on the choke, but this time that make nearly no difference.

Do I have to take it back to the pros or is there something that I can do? I heard this model has no mixture screws to check/adjust. The unit has a 19.5 Briggs & Stratton V-twin engine.

Thanks!
This sounds like to me and it is my opinion that the carb either has trash in it or bad fuel...I have fixed several issues like this for myself and friends and more times than not it was a carb issue
 
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