V-Spec Bearings
#2
I'd say at the first sign of wear eg. excessive float or feel gritty. Or just precausionary after 20 litres (5 gallons)
#3
I had 4 gallons through mine and the main bearing went and made the piston rub. So I changed the main bearing right from the beginning, I will not go over a gallon with the stock bearing. When you take it apart the stock bearing looks cheap. I believe my v-spec is a 2006 because on another thread someone said that the 2006 v-spec has a silver backplate and the 2007 has a black backplate. I'm not sure, if you have the 2006 v-spec watch out for the bearing issue.
#5
I always use and suggest the TKO ceramics in my modified Vspec's, or stock Vspec's.
#6
my main bearing went so i replaced both bearing (poss overkill) with TKO ceramics and a new rod, still going strong and it seems to really make the engine fly, as if they werent fast enough stock