Compression test,Here is my results.
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Posted by Marcus (184.108.40.206) on July 20, 2005 at 17:37:55:
I have a 1970 mercury 4 h.p. model 40 ser# 2925185.I checked the compression when dry and got 30lb put 1/2 tespoon 30 wight motor oil. went up to 90lb hooked up a wd40 tube in the carb and sprayed the same time I was pulling the rope. Notto nada zip. I had gas hooked up at the same time. I check the compression, after all that and got 75lb. I did have oil on the plug amd smelled like wd40. What next
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