My e50 airsal is single embossed needle clipped third down from top. Not sure if I am getting past 40 as speedo doesnt go past 40 but with the mesh filter and 14x40 gearing it is screaming loud, especially when I lay off the throttle (i am guessing bearings and seals). I can accelerate up big hills. Need to tune clutch to be able to get off the line with 16x40 and expect better top end but 40 is more than fine really. I like the sound of the mesh filter but I like what you did with the stock airbox. I would like to quiet my bike down a bit and not lose anything. how did you decide on the 2.17 for the 14 as opposed to the 2.22? Is there any difference between a 1/14/152 and 1/14/160 other than when they were made?