Can i and should i break in metal (steel pinion/alum crown) gears as i do plastic gears on G3R polymer setup?? thanks in advance mj

Whose gears,and yes i would break them in.
You might try asking your question here,these guys are into the hardcore stuff.
http://www.ho-tips.org/

Thanks Hornet, Wizzard gears steel pionon (7T) and bronze crown (23T). I want to try metal and see how it compares. I will also try that tips sute. mj

You might see your laptimes go up,quite often fresh plastic parts are faster.