Engine Compression Question

joemoss

Forum Newbie
Joined
Apr 19, 2017
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I have a 11.5 hp Briggs with intake valve issue. On the compression stroke the intake is open .005, when the piston is about 1/2 inch from top dead center it closes. At tdc the valve tappit gap is .007. The timing of the valves is correct. Exhaust closes as it should. What could be causing this? Is this a cam lobe problem? Thanks in advance, Joe
 
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bertsmobile1

Lawn Royalty
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Nov 29, 2014
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YEs the intake closes then reopen a touch to decompress the cylinder at cranking speeds.
 
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