EX400rider
04-03-2006, 08:01 PM
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!!!