Briggs: 331777-1107 B1 080320z (numbers are pretty tough to read. I cleaned it up the best I could but am not sure about the last couple in the code.
Nikki Carb 594601 (part number from parts site)
Off a tractor but not original to the tractor. Someone put this engine in an old MTD. What a mess.
I got this tractor in that had trouble starting. It needs to be primed with a little gas down the throat to start but once it starts, it's fine. So I took the carb off and noticed a couple of things.
1. The after-fire selenoid plunger is sluggish and the solenoid itself is filled with gas. When I shake it, I can hear it sloshing around in there. I'm guessing there was some sort of o-ring around the plunger shaft but that's long gone if there was.
2. I guess there are two carbs for this engine. The carb I have is the one with the plastic fuel transfer tube body. The float and needle are also plastic. The main jet is a little thing that has an o-ring on it which I guess is supposed to provide enough of a fit to keep it in the end of the plastic tube. But it falls out pretty easily.
Here's a link to the carb info.
http://outdoorpowerinfo.com/repairs/briggs_intek_single_ohv_nikki_carb.asp
I'm guessing the solenoid is junk?
And that main jet, it fell right out of position when I took the carb apart. And when I install it and tip the body upside down, which is the way it rides, it falls out most of the way. Is a new o-ring and/or main jet needed?
Thanks very much.