RE: help please
The bulk of the membership on RCU may not be familiar with this "Himark 2000" motor. I know I haven't heard of it, and I can't find any useful reference to it with Google. Can you post a link to it?
Without any specifications, there's no way to know what battery and prop will work, or if the motor is even suitable for your application.
What was your reasoning behind choosing this motor?