Guys. I’ve had this mower since early 90’s. I believe it was built in 86. I have yet to find the correct maintenance manual for it. It used to have a sticker on the gas tank that said it was a 12SB with what I think is a lawn boy f series motor. I also think they only used the motor in it for 1 year. I’ll attach pics of serial/model number and what it looks like. I’ve looked everywhere for it. I’ve even been to JD site. Even the dealer has had a hard time looking it up. Any help would an appreciated. 
