Small Engines (Lawn Mowers, etc.): 12hp briggs doesnt run, automatic decompression, wd 40

Question
Hi, I have a 12hp briggs that doesnt run. It has  good spark and its getting fuel, but I think compression is the problem. I pulled the head off and it seems like the valves do not shut completely.Other than that, they seem to operate normally.Is this normal? Or do I have another problem? Any help would be great!  

Answer
Hi Scott,

Normally the valves should close but some models have an automatic decompression relief, which I am not familiar with.  
For more info check out: http://www.briggsandstratton.com/display/Router.asp?DocID=64103

Your valves may just be sticking.  Try some WD-40 to loosen them.  Or they may need resurfacing.

Let me know how you make out.
Michael