I too have struggled with a Zenith on a 140. Either it would overflow gas and flood, or it would not take gas at all.
I must have disassembled and reset the float level a good 8 or 10 times. Thoroughly frustrated I finally discovered the viton tip on the new needle valve was molded off-center. Also I found small dimple worn into the float arm. This was catching the bottom end of the needle and preventing the float from operating properly.
Solution was to polish out the dimple in the float arm, then stick the old needle and seat back in.
But finding the right float level was still difficult. Took a bunch more trial and error adjustments to get the tractor run without leaking.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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