Well today i picked up by 14r from the shop after getting it streched out 6 in and lowered. Well i too had the HORRIBLE 2nd gear stumble,the bike shop mechanic took it for a 5 mile drive and said oh yeah that sucks.Well anyway put back on the 42 rear sprocket and.........PERFECT. Thank god it's back to normal he said its the ecu reading the new sprocket and the rotation is off or something like that don't really remember to be honest,all i care about was its back to being normal. And truthfully i cant tell the difference from the 43 to 42 sprocket change,but i sure as hell can tell the difference with the 16 front sprocket back to 17,i did that last week and at first the bike felt soooo much slower building speed,but its alot smoother on the highway now that's for sure. And to be honest streching the bike 6in and lowering it i don't feel that much diffrence to be honest. Now i'm no corner carver but in the long nice sweeper it feels very planted now.Plus it feels so much better on my wrists with the bike being lowered a few inches!! The only real complaint is when i downshift now its kind of rougher like a harsh snap. I guess its from the longer chain or now i have a stronger chain[EK ZZZ] i don' know really,but i know when i downshift its much harsher,but only on the downshift the upshifting feels just fine. Thanks again seno my babys back!!!!!!!!