It will go about 70-75 stock
With stock gearing around 63 mph
stock gears around 75-80mph
700cc / .73qt
With stock gearing 62-65 mph
Stock the claimed hp is 40 hp.
These (link below) are for a 08 RM 125.
Will a 94 rm 125 engine fit on a 2000 rm frame?
A 1997 rm 125 can go around 60mph.
There is a big difference the rm is much faster