Re: 1957 Big Twin 35hp questions oil, engine "Bucking" Home › Forum › Ask A Member › 1957 Big Twin 35hp questions oil, engine "Bucking" › Re: 1957 Big Twin 35hp questions oil, engine "Bucking" fleetwinUS Member - 2 YearsReplies: 4737Topics: 46 June 11, 2015 at 11:59 am #17959 Yes, definitely run the engine at 24:1