OBELN vs.OBEKN vs.OBDQR
Posted May 21, 2002 - 02:08 AM
2002 WR426 Canadian
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!"
Posted May 21, 2002 - 07:16 AM
Posted May 21, 2002 - 12:31 PM
The exhaust may be keeping it rich on top and the Exx needles need smaller main jets than Dxx needles because the smaller(E) needle tip lets fuel pass more easily. The richer clip position (#4) is used to balance the smaller main jet in the middle. An open exhaust YZ426 will use ~ELN#5 (EJP#4) with a #162 main.
Posted May 21, 2002 - 01:44 PM
Posted May 21, 2002 - 10:39 PM
[ May 22, 2002: Message edited by: blue beast wins ]
Posted May 22, 2002 - 10:45 AM
Posted May 22, 2002 - 12:50 PM
the reason some are running leaner here is due to high altitude
or to running the #160MAJ
if you go to 168 i think you'll be fine. drop the needle at the same time to keep that sharp midrange.
i'd recommend the 38PJ as long as you go to #60PAJ.
[ May 22, 2002: Message edited by: Taffy ]
Posted May 23, 2002 - 01:33 AM
Sorry Garry thought you had a YZ just re-read your old post My mistake
[ May 23, 2002: Message edited by: RSA210 ]
Posted May 23, 2002 - 02:47 AM
Posted May 24, 2002 - 03:03 AM
If I decide to try the ELn again, w/40p..would the 75PAJ make the starting issue less of a roadblock w/small temp/humidity changes??? I was just made changed it back to the way it was...let me know what you think on this..much calmer today so I could be tempted for more testing
BTW, the bike never started(2plugs) yesterday w/the ELN needle in there. Jason
[ May 24, 2002: Message edited by: Jason in KC ]
Posted May 24, 2002 - 10:34 AM
we are both fluent but sadly at two different languages. what the blinkin 'ek did you say?
Posted May 25, 2002 - 09:16 PM
What Jason is trying to get across is his cold start problem. He was wanting to know if going to the 75PAJ might help. He believes that the 100PAJ that he has installed with this set up is allowing to much air for the amount of fuel at start up. Causing a very lean start mixture.
40PJ, 100PAJ, ELN @ #3clip.
He is thinking about going to
38PJ, 75PAJ, ELN @ #3clip.
This is a cold start issue that he is addressing, hopefully this interpretation will work.
Posted May 25, 2002 - 12:42 PM
try 158MJ and needle on c4 (half way)
ELN clip 4
PS 1-2 turns
Posted May 28, 2002 - 06:47 AM
I will order the 75PAJ today and hopefully get to try it out soon. Any other needles worth trying, granted I am sold on the ELN, just wondering what else may work good w/the YZ426. Thanks a bunch and I will report my findings..