I have a Toro 721 snowblower. A few seasons ago I accidently overfilled it with oil. It blew out the oil thru the breather tube. I cleaned it off and made sure to top it off correctly. It worked fine the few times I had used it since. I found it leaking though, which I think I narrowed it down to a leaking drain plug or the breather tube again. There are two oil plugs and two dipsticks... one accesible from the top for changing oil and the other on the bottom. The bottom one was leaking (I never opened that one before) and while I had it flipped over redoing that plug, a significant amount of oil leaked from the breather tube thats attached to the ohv cover. Is that supposed to happen if I had it tipped over the wrong the way with a drain plug open? Or does that indicate a larger problem? What damage could I have caused by overfilling it in the first place?

So, last week the mower worked fine. I tried to start it this morning and it ran rough for about 3-5 minutes, then stopped. It did this every time I tried it. I had bought a carb rebuild kit last year but never got around to doing that job, so I took this opportunity to do that. I disassembled everything, thoroughly cleaned every orifice with carb cleaner, replaced all gaskets, seals, even replaced the tiny pink rubber "washer" that the small float rests on (and the float). After reassembling everything, it won't start at all. I took the air filter assembly apart and noticed that the plastic "arm" that controls the choke/metal plate was not moving, so I fixed that issue and now I can move that arm back and forth freely and see the choke plate move freely. One thing I didn't pay attention to unfortunately that I'm now questioning is this. In the attached pic, that white plastic piece is sitting flat (that's a pic I grabbed online. It's not mine.) My plastic piece is raised up maybe 1/2", but I couldn't see anyway to make it sit flush. Is that plastic piece supposed to be setting flat, or should it be raised up about 1/2"? I can get a pic of how it looks tonight or tomorrow if that helps. When I put that small "pink washer" that the float sits on inside the hole, I made sure it was oriented right, then used the blunt end of a 3/16" drill bit to gently push it down all the way. It looked like it was sitting flush at the bottom of the "shaft" it went into. The one simple thing I didn't pay attention too is probably the thing that's causing me problems. :( Other than that, is there anything else I can check, or do you suspect that is the issue (the big white plastic piece not sitting flush)? Briggs & Stratton engine Model 126T02 Thanks, Andy