Re: Unusual problem on a 5.5hp Johnson 1960 Home › Forum › Ask A Member › Unusual problem on a 5.5hp Johnson 1960 › Re: Unusual problem on a 5.5hp Johnson 1960 stevehUS Member - 1 Year (includes $3 online payment fee)Replies: 127Topics: 26 June 27, 2018 at 12:58 am #78527 My ’59 CD-16 5.5 had similar symptoms. I replaced the thermostat and cleaned the points. Fixed the issue.