Read this Kelly- re .020" Ryobi sparkplug gap- As per Denso
http://www.globaldenso.com/cgi-bin/global/plug/usa/sme/sme-plug.cgi?action=search&filename=sme-916.txt
Hi and welcome to FixYa, I am Kelly.
The spark Plug Gap is 0.030. Any original or aftermarket spark plug for this unit is pre-set to 0.030. Unless you dropped the replacement plug it should be fine. All Ryobi engines 2 and 4 cycle have a 0.030 spark plug gap.
Thanks for choosing FixYa,
Kelly
I had lost the user manual. When I found the manual it said 0.20.
Correction. The manual said 0.02
Every manual I look at has it at 0.30. Your owners manual may be correct but as a service person since the 1960's I have never seen a spark plug gap less than 0.025 on any lawn maintenance engine. The range is 0.025 - 0.032 regardless of brand. All Ryobi service manuals have the gap listed at 0.030. With a gap of 0.020... a speck of carbon will cause your spark plug to ground out and you will be cleaning the plug or replacing it. Your choice as how to proceed. I am just passing on almost 5 decades of my own small engine repair experience.
Kelly
Word for word from the manual: SPARK PLUG REPLACEMENT
This engine uses a Champion RY4C spark plug with .025 in. electrode gap. Use an exact replacement and replace annually.
Kelly
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