The last time I changed the oil in our 2017 Yamaha I took a Phillips head screw driver (large one) and made a hole in the spark arrestor (about 3/8 inch diameter). I really believe the cart runs better, no change in gas mileage, no change in noise level, but the cart seems to have more get up and go.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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