I'm currently in the middle of doing a motor swap from the original FR691V to the FB460V after the FR691V decided to blowup. So far everything has been lining up on the swap until I get to the oil drain it puts it right where the motor sits, so that has me a bit confused on how to drain the future oil changes.
Use a sump pump
They are cheapest from boating supplies
I have not touched a sump plug for over 12 years and that includes my cars & motorcycles let alone customers mowers .
