Posted by George Marsh on October 31, 2013 at 11:41:03 from (205.188.116.10):
Helping a friend get his mower running. I think he has a bad cam. I put my 400 cca battery in mower. Starter won't spin motor over. Took spark plug out; motor spinns just fine. I checked exhaust valve and set it to .004. When I turn motor over by hand, shouldn't the exhaust valve open for a moment during the compression stroke, exhaust valve becomes the decompression valve? Well it doesn't. So, I decided to put spark plug in only half way allowing some compression to escape past the plug threads.
It spins over and starts just like it should.
I'm thinking it has a bad cam? Anyone have cam problems with the 18 hp single cylinder briggs? Anyone have experience changing the cam?
Any idea how to tighten spark plug while it's running?? Just a joke, OK?
I'm thinking Bubba may install a pet-cock valve like those on the old JD's? George
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