This video shows how to adjust valves on a 18.5 hp single cylinder Briggs & Stratton engine. This is a common engine found on John Deere Z225 riding mowers.
The procedures are the same for most Briggs & Stratton single cylinder engines, but make sure you have the right specs by looking for the correct repair manual and finding the correct specifications for your specific engine. Here are the links:
Briggs & Stratton repair manual lookup by model number: www.briggsandstratton.com/content/dam/briggsandstratton/na/en_us/Files/FAQs/model_vs_repair_manual2.pdf
Manualslib.com URL: www.manualslib.com
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DIYmoto