To get the 5300 rpms out of the generator, 

½” pulley on the dynamo.  

For our engine, the flywheel is 2.5".  5300/5 = 1060 rpms roughly.

These steam engines typically run at 500 RPMs and the boiler works hard for it. 

So finding an engine with 6.5" dia. flywheel would be ideal. 5300/13 = 410 rpm roughly

Optimizing the pulley and flywheel sizes can help achieve the desired RPM efficiently and improve engine performance. Considerations like these are crucial for maximizing generator output.