The gap for most Ryobi that are two cycle are 0.020 in. 0.5mm and this is 0.025 in. which is 0.635. With this engine it doesn't make that much of a difference. It's not a highly tuned precision engine.
Great question, Cupton! The spark plug is built for use with 2-cycle engines and fits RYOBI and Homelite 2-cycle trimmers. I hope this helps and we appreciate your interest in RYOBI! -Keri
Hello Kame, I apologize for the delay in response and thanks for your question. This RYOBI 2-Cycle Spark Plug socket is 3/4". - Eve
The only Expand-It Ryobi's I'm familiar with are 40V electrics and not gas powered, therefore wouldn't be using a sparkplug. The Expand-It I'm referring to applies to MODEL: #RY40250. Is this what you have or do you have a gas powered trimmer of theirs that has interchangeable parts?
RDJ7Y according to the manual
Hi Rory, Thanks for your question on the Ryobi AC00160A 2-Cycle Spark Plug. This spark plug fits RYOBI and Homelite 2-Cycle Trimmers. Thanks for reaching out to us! - Eve
You could contact our Customer Service Center (1-800-860-4050) and speak with a Ryobi Technician, or you could check your unit in for service at your local Home Depot store's Tool Rental Center department or Special Services desk.
Hi CS this spark plug will fit the RY29550/E530 touchstart trimmer. Thanks for asking. Greg
Hi EricH, With out knowing the actual model i can not say for sure this will fit the blower. But this plug will fit the majority of our 2-cycle tools. Thanks for asking. Greg
Hi pa, spark plugs generally come pre gapped. Hope this helps!