Here is a cylinder  from a Lawnboy model number 10227 serial number 6920839. Engine was a 4.75 Hp commercial grade silver series   picked this unit up on cleanup week so I don't know any history. all parts sold as is. no broke fins threads good. some scoring will need to be honed out to next piston most likely. currently std bore.

CHECK YOUR LOCAL DEALER FOR FITMENT IF YOU ARE NOT USING THIS ON THE EXACT SAME YEAR AND MODEL.I leave feedback once it has been left for me, this tells me you had gotten the part. WE COMBINE SHIPPING. Items are usually shipped within 5 business days of payment, PLEASE ALLOW AMPLE TIME FOR IT TO GET TO YOU BEFORE CONTACTING ME, Once shipped I have NO CONTROL over it. IF you think shipping is too hi, just don't buy, it's non-negotiable. A lot of these parts are 25 yrs old or more, if you are looking for perfect parts do us both a favor and buy new. these are used and no warranty. These are meant to get your bike/unit on the road and use YOUR judgement for restoration purposes. When asking ?s give info such as addresses & item #s or your ? may not be answered. FREIGHT CHARGES PREFIGURED ON LARGE ITEMS SUCH AS FRAME & EXHAUST MAY NOT ALWAYS BE CORRECT. ALL SALES FINAL!