Posted by Roger46 on July 25, 2010 at 17:57:01 from (75.221.170.183):
I will try to keep this short as I have tried everything I can think of to get my Cub started after taking it to the Wisc Farm Tech Days. I thought I could get any engine to run, but apparently I have failed on this one. First, at the Farm Tech Days, the last day it rained two inches and the Cub was outside. I had the muffler covered, so no rain in there. I ended up loading it dead on my trailer to get it home. First I thought the magneto was wet, but everything seems dry and if I take out one of the plugs and crank the engine I get good spark (I even checked and adjusted the points). I checked the timing and it sparks at the plug (out of the engine) at TDC (also put my finger over the spark plug hole to make sure I was on the compression stroke as I was hand cranking it to TDC). I checked the wiring to make sure someone didn't mix them up, but that is correct (1-3-4-2). I did a compression check and got about 120+ per cylinder. When I crank it with the starter it does not fire at all. I pulled the plugs and they were wet with fuel (gasoline drips out of the carb after cranking). I even put in new gasoline (purged old gas out of carb by draining and letting some run out to clear the lines) and nothing. Then I took off the air cleaner pipe and sprayed starting fluid in while cranking with the starter and still nothing. I even changed some of the spark plugs with some I knew were good and still absolutely nothing. I took the plugs all out and let them dry off and let the cylinders dry out from the fuel thinking it was maybe really flooded, but still nothing when I put them back (after letting it set for a day). It seems to be an ignition problem, but with spark at the correct timing it would seem to rule that out. Can anyone think of other things to try? Is there anything weard about a magneto that will let it fire at the correct point at very slow speed with the hand crank, but when cranking with the starter it fires at the wrong time (my starter cranks the engine over quite fast) Roger
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