bore it?? to wat IDK but want sumin

[EX400rider]

my 400ex is getin a lil to slow for me. I want to bore it up but dont no wat to bore it up to. Maybe a 416,426, or 440. If i do get one of these then will i have to treat it any different then stock. Also if i do have to treat it diferent then will i have to change piston and rings often like the 450r? PLZ help me yall!!!

[4everhonda]

Just put a higher compression stock or 1mm over piston. You dont get all your power from cc's, you will hardly notice 426 from stock. its the compression that matters.