Seems the mabuchi search link didn't work........
Here's another.

http://www.mabuchi-motor.co.jp/en_US/pr ... _0305.html

Home Appliances & Cordless Power Tools

Drill
Screwdriver
Garden Tool

RS-380PH
RS-540RH/SH
RS-550PC/VC
RS-755VC/WC
RS-775WC
RT-8B7WA


Gives an idea of the possible motor specs.