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Rick, Factory Authorized Trainer
Category: Small Engine
Satisfied Customers: 8063
Experience:  Outdoor Power Equipment technical trainer since 1990, covering eight states.
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what are the valve settings on a briggs 18.5 motor

Resolved Question:

what are the valve settings on a briggs 18.5 motor
Submitted: 7 years ago.
Category: Small Engine
Expert:  Rick replied 7 years ago.



When you say 18.5 hp, I'm assuming this is a 31P777 model single cylinder overhead valve engine or similar? Is it's different, please let me know, but the following is correct for this family of engines.


Intake - .003"/.005"

Exhaust - .005"/.007"


The setting should be done on a cold engine with the piston 1/4" past top dead center on the compression stroke.


Hope this is helpful!


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