Honestly, I've only used 2....May 18 2012 at 3:29 PM
from IP address 220.127.116.11
Response to polymer gears
....and the engines are in "toys" that really don't see enough mileage to warrant an inspection.
I don't care for the bronze gears and the steel gears seem to be the best bang for the buck.
B2 Motorsports, LLC