hi guys I am new to posting and asking questions but not real new to the site. with that being said, I just bought a 2000 Yamaha YZ426f and when I got the bike the breather box was opened up and I had assumed that they had re-jetted the carb as well but I was wrong. the bike was running way too lean and back firing when I let out of the throttle. I re-jetted the carb taking out the stock 42 and 162 jets and replaced them with 48 and 170. now the bike runs good at idle and above 2/3 throttle but when held in any gear around 1/4 to 1/3 throttle it sounds like it misses every now and then also still has a little popping noises when let off the throttle but not a backfire. Is my bike still running lean and if so should I go to a bigger pilot jet for the lower idle?