Ryobi Conversion
 

Go to this web sight. http://www.rcfaq.com/ You can find out about everything you need to know about gas engine conversions. Very good information. Some where in this information there is a mention about a replacement custom built ring for the Ryobis and other engines. I am told it is woth the cost of $12.00 dollars being asked. I am present converting 5 of these.