Re: Mcculloch 4hp no start Home › Forum › Ask A Member › Mcculloch 4hp no start › Re: Mcculloch 4hp no start john8504Replies: 169Topics: 31 May 24, 2018 at 1:37 am #76630 Putting back together and I have a o ring missing from upper shaft where it connects to block. How pertinent is it to have? Attachments: