Re: Is there a 12 volt starter that would fit in a RDE-17 1955 Johnson 25 hp starter bracket? Home › Forum › Ask A Member › Is there a 12 volt starter that would fit in a RDE-17 1955 Johnson 25 hp starter bracket? › Re: Is there a 12 volt starter that would fit in a RDE-17 1955 Johnson 25 hp starter bracket? olcahUS Member - 1 Year (includes $3 online payment fee)Replies: 566Topics: 94 April 19, 2018 at 2:34 pm #74320 I believe there are both large diameter six volt starters (cira 1954) and smaller diameter (later) six volt starters. I think that the bracket and starter that Wyo has is likely from a 1956 30 HP and the 4001 starter is a six volt.