While I usually have great luck with inexpensive mail-order import replacement carbs for OPE, man has my 18.5hp Briggs 31P777 series engine proven to be challenging in this area! I had some issues earlier this year which warranted replacing the original ~2007 OEM carb on this engine. The first replacement eBay carb came with a misaligned choke, that I was able to fix short term, but iteventually broke all together. The second eBay replacement was fine aside from the electrical connector to the fuel shut-off solenoid not allowing the wire from the tractor to lock in properly, plus a very slight fuel weep from the solenoid somewhere. Today the mower wasn't acting right and I discovered sparks from both ends of the throttle shaft and the little fine wire return spring on the throttle was glowing like a light bulb filament! WTH!! If you pull the fuel shut off solenoid wire the sparking stops (but obviously kills the engine). Killing the ignition also stops the short. I'm assuming the solenoid although doing it's job, has an 'electrical leak' going on? Never ran into this one before. Luckily I've got 2 other solenoids from the other 2 carbs to try to swap to.
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