First off, if this is the wrong place I'm sorry. I have a 1990 Yamaha blaster that i got for $320. Turns out it needed a top and bottom end rebuild. I took it apart, replaced the crank with a wiseco one, replaced the main bearings, and most of the seals. I then put it back together with a wiseco piston, rings, bearings, etc set. I started it up yesterday for the first time, and it ran meh. wouldn't idle, but it would run. I held the throttle open just enough to keep it running for about 15 minutes, then drove it around for a little bit, but it would never idle. today, i got it to kinda idle, but only on half choke. full choke, dies. no choke, dies. It also runs hot and started to melt the rubber connector between the expansion chamber and silencer before I shut it off. Also, the plug is sooty, as it looks like it is running rich. I don't know why it is running rich,nor do i know why turning the choke off doesn't make it run better. Also, I realized that that whole time I was running 1:50 premix instead of 1:32 for that whole time. I thought that the premix chainsaw containers made 1:32 but they make 1:50. Would this toast my rings in about 1 hour of total run time? I added oil to my tank to change the ratio back to an acceptable level, but I hope it's not too late. One final thing, what does that little plastic tube on the clutch cover do? It's hard to explain what I'm talking about, but it is a tube that juts out of the cover and it is approx. 1.5" long. It's not connected to anything. Would this cause my engine to run odd? Any help will be appreciated. I will answer all questions.