I acquired my 2001 WR 426 three years ago from a gentlemen that rode it twice and did not like it. I then immediately started adjusting it to fit all 6’6” 275 lbs of me. Flex bars, free mods, Quick shot, Z clutch, Race Tech fork and shock springs jets and I had a bike for once that fit me. (both of us big and heavy) I am a woods rider and I have become quite fast as this bike and I work well together. The last couple of rides I have started to notice some white smoke more so when cold or under heavy accel. Maybe a slight loss of power. I am meticulous with my maintenance. This bike has always started in one kick never hesitates, bogs or surges. I don’t even remember what jetting I ended up with as it has been flawless. I am looking at the 444 big bore kit and I am somewhat hesitant as I do not want to end up with all kinds of drivability problems. I am spoiled with my now tired machine. I think I would like to upgrade the power, what do you guys think? I hate to take it apart and not give her a little something. I guess I need to know the power difference and how I would need to jet it as I am so spoiled with how it runs know. Any thoughts would be most welcomed. Thanks.