I have an old Ohlsson and Rice model C 3 Motor. By what i have been able to find out it was modified by Octura to water cooling for boats. the motor runs real good, the previouse owner changed the carb to what looks to be a large nitro carb (not sure). He was building a scale boat with the motor in it before he passed away. one thing the motor needs is a collet for a 3/16 shaft. He set the boat up for this motor and a 3/16 shaft. Any ideas?

Nice piece of History .... How far we have come in 2 stroke tech
Paper weight is my thought ....