Well that was a lot of fun. Glad I asked. I do idle it down, unless I forget, and the backfiring stops. Just wondering if I had a defect. Perhaps an exhaust valve could be causing it, but that would be beyond me. My old 127 with power lift and a hydrostatic is a most amazing unit. It was 10 years old when I bought it from my next door neighbor and other than a couple filter changes and new oil ever 15 hours or so it still runs like new. I don't let rust get to it and while faded in places it looks good. I can't believe the condition of some of the Cubs I see. Some looks like they have been salvaged from a Spanish Galleon. Kind of sad really.
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