I have at least 3 gallons throw my Savage and more then likely like 5 and with my pull starter I still have the same one way bearing. I am getting ready to do a big change over on my Savage and updates. One of them is LCG chassis and you cannot user a Roto Starter with the LCG chassis.

According to Towers this is the backing plate but I would check the number on HPI web site first before ordering.
http://www2.towerhobbies.com/cgi-bin...?&I=LXFET1&P=V