My first action was to pull the belt cover and put a wrench on the bolt head of the crank. I was able to rotate the engine about 3/4 way backwards and forwards. I have a flat-head Honda generator I was given which had the same symptoms but was caused by crud build-up on the cylinder head.
When I pulled the head of the snowblower the cylinder was about 1/2 inch from the top and had about three tablespoons of water frozen there. I scooped it out and the engine would rotate freely completely around. I left it open with a heater on it to evaporate any water I couldn't get with a cloth. The head had the very start of rust (water was only in for three weeks by my guess) and was easily cleaned up with a scotchbrite pad.
When I thawed out the chunk of ice which was in the carb bowl, the gas started flowing into my catch can completely freely.
I had just changed the oil but when I checked it yesterday it wasn't "fresh" oil. It had a slightly milky appearance. That leads me to believe that I have water in the crank still. My sleuthing has led me to the possibility that with a bit of water in it the oil will froth up and cause this issue.
I also think that there could be water frozen somewhere in the system. causing the over pressurization. I plan to change the oil again and keep it in a heated area for a while and see where that gets me. I don't mind pulling it apart again but taking off all the fiddly little bits of plastic is a chore. I did re-use the head gasket but it looked pristine to me (even though the machine is 7 years old). There was no scoring or significant discolouration of the cylinder or cylinder wall. And it ran fine for 10 minutes after re-assembly. I'm hoping its errant water frozen somewhere and will work out with some heat.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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