This is a line of 4 stroke products called "Air Clean" to address mounting critisizm from the greenies about 2 stroke pollution.
Not true, there are patents on features used in the Ryobi, they only offered to license other manufacturers.The only one to take them up on the offer was Zenoah/Redmax, the Ryobi Gen III is the same as the 25cc Redmax, why anyone would want to copy that POS is beyond me.
I've not yet been burned on Ebay either. Best advise is to write emails to the seller and gage the responses. Most
crooks are illiterate and have no social graces, so you likely can tell with whom you're dealing. Anyway, the mailman will be here soon with my carb, so we'll see.
It wasn't long ago someone posted a link in this forum to an auction that was offering brand new carbs, well they weren't, so my guess is that the crooks are working the forum and ebay in tandem.