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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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