Wanted to make a quick post on my layman observations of needle trial,and pose a question. 2002 WR426 Canadian Main-165 Pilot-42 OBDQR-Clip-4 P/S-1.5 Turns Out All Air Jets Stock Air Box Baffle Removed & 4 Holes 1inch in diameter,stock Euro exhaust,94 Octane Sunoco Unleaded,Fresh CR8E Plug.Stock AP Setup At or Near Sea Level Temp 60Farenheit Stock machine ran great,roll on throttle wheelies in 2nd & 3rd gear.OBDQR needle pulled great mid to 3/4 throttle.I liked it!!!BBUUUUTTT!!!!! I'm curious so I bought a OBELN & OBEKN I know,I know they are a half a clip apart,like I said I'm curious!!!Trying to get this machine to run better with stock exhaust configuration. Trial #1 Note:Main & Pilot Never Change,just needle & PS Setting. OBELN-Clip 3 PS 1.0 Turn Holy Crap!!!!!!Gobs of power down low a tractor.but it did'nt seem to follow through all the way.IMHO you might want this for offroad,single track.Did not match the midrange of OBDQR.Albeit a good choice to shift power/torque down low. Trial #2 OBEKN-Clip 4 PS 1.25 Turns A shift of power!!more like stock but seems too rich in the middle,struggling against backpressure of Euro exhaust,but more tractable,gone are the roll-on wheelies,IMHO too rich. Now the question I pose to myself and fellow TTer's WHAT to do.I may consider dropping the Needle on the OBEKN to see what happens.What is the difference between OBEKN-2nd clip & OBDQR 4th clip?I would like to know.Is there more POWER to be found in the middle?OR did Yamaha get in right with this bike?A fellow rider rode this bike and swore to me it ran better than a U.S.model WR400 with throttle stop/air box/exhaust plug out.Go Figure.Anyhow I suck at typing so I'm done.Any similar experiences/comments with these Canadian WR 426's would be appreciated. Oh P.S.-520 EXC rider rode this bike in stock configuration and commented "This thing snaps like a two-stroke!"