If it's a DC motor, running at a little higher or lower voltage isn't a big deal, the motor will just spin faster or slower.
Most electric motors that are higher voltage, such as 200-300 volts are usually AC. DC motors in that range would be very unusual.
AC motors need very different control than DC. Always make sure you know what you have. AC and DC are two very different things when it comes to motors.
I just looked up the Kostov brand. Yipes! They make some big DC motors!
http://kostov-motors.com/tractionmot...ctricvehicles/
They have a couple of DC motors that are rated for pretty high voltage. The Open Revolt will work fine with those motors, but you will have to keep the charged battery pack voltage lower than 200VDC.
You probably wouldn't want to do more than a 156V nominal battery pack. It would still run a Kostov fine, it just won't spin as fast as it would at a higher voltage.