I had my lawn mower serviced earlier this summer (walk behind Murray, 4 cycle, B&S engine). My carb was full of particles and rusty. The technician advised
-use fresh fuel each time
-do not store gas longer than a month
-use the mid grade gas instead of the 87
-add a fuel stabilizer to the gas can then add the mixture to tank
-empty gas from tank before storing (I know this is something many already do in the winter, but I have been neglectful in the past)
I hope this helps anyone who doesn't know, if any of this is inaccurate or there are other tips let me know. Also, this is not for 2 cycle.
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