So I'm going to start by saying I know nothing about small engines or carburetors or anything having to do with this section. And I'm kind of embarrassed by my lack of knowledge but I need to ask... I have a Yard Man snowblower, one of the big ones on tracks instead of wheels. I have two issues. First - after running for a while, it looses it's "go". Like it slows down and won't move as fast. Sometimes it will quit moving altogether (the engine runs, it just won't move). From looking at the parts diagram I see there's a friction disk part. I'm guessing replacing the rubber there would be my first step in trying to fix this? Anything else to look at? Second - this is the dumb one. My muffler glows red hot sometimes. I'm guessing this isn't normal? So when this happens, I can get it cooled down by closing the throttle a bit. But, obviously I'd rather get it fixed right. This would be a carb issue? Is it running lean? Is it worth trying to run some carb cleaner through the fuel, or should I start with taking the carb off and trying to clean stuff? I have no idea what I'm doing so I was thinking about taking it apart, hosing everything down with carb cleaner, and re-assembling. My engine is a Tecumseh HMSK90 - I Google "HMSK90 carb rebuild kit" but all I get are replacement carbs. I couldn't find a rebuild kit listed as a part looking at genuine Tecumseh parts dealers, either. Does this mean there's not such thing, or am I mis-Googling here? Thanks for any help!