i have a 1936 seaking made by montgomery wards the size is 2.5.the flywheel turns and its getting a spark with the right tools and a little know how you can have it running like it was 3 yrs ago.The reason i'm selling this is because i dont have the tools to take it apart and clean what needs to be cleaned.I'm not sure if u can tell in the pic's it has it's own gas tank built in and i have a pull string to.