I was having heat problems earlier this week, and asked you guys for some help, and got a ton of feedback. I checked my plug, fine. I tried 16:1, 24:1, and 32:1 with similar/same results. Checked for air leaks and cleaned the air filter. I decided I would put a few more miles on it so I could be sure it was broken in, before I continued annoying you guys. Anyway, I've run a decent amount more gas through it, and it's still a problem. It seems that people here are a little divided over whether or not it'd OK for water to boil off of the head, but for the short length of time it takes to get to that point, there's no doubt in my mind that it's not doing what it's supposed to. Also, something that I didn't mention before, when I open the throttle too quickly (much more prominent on a cold engine) the engine bogs down-- I am pretty sure it is four stroking. With such a cheap engine, I would be surprised if four stroking *didn't* happen, but, it happens a lot... do you think I might have a fuel-air ratio problem? or any other ideas? Thanks guys, sorry to be so pesky about this. Grubee skyhawk 66cc slant head.