so i bought a 26mm carb for my 04' 250ex off ebay, turns out the intake side is 26mm so is my stock carb. so now i have two identical carbs. the piston valve is 20mm which i now believe is how honda measures. the forum suggest using a 26 or 27mm carb from an ATC 200 deos anyone have the physical demensions of the carb so i can purchase the proper size. i have a full HMF exhaust and K&N filter with no lid do you think persuing a larger carb will help?