WR426 cam timing / jetting
Posted March 25, 2003 - 05:54 PM
Posted March 25, 2003 - 09:49 PM
I will post my results.
Posted March 26, 2003 - 04:55 AM
My bike is set up pretty much the same as yours but I have left it WR timed. Jetting is stock. Raised the needle one clip (5) and went in a bit on the fuel screw. The bike runs fantastic at all throttle positions. I have an ELN needle and other jets but it runs so good I won't mess around with jetting (at least for awhile). Most of the jetting experts agree that going to YZ cam timing does not effect jetting. I think the open airbox and open pipe need the richer E taper, YZ jetting. I run the Baja designs vor tip at sea level and wonder if the E taper might be a little rich with the insert in. Good luck with the search for perfect jetting.
Posted March 26, 2003 - 06:01 AM
HERE you will see that changing to YZ timing definatly affected my bike.
Changed it back to WR last night and it still ran like crap, so I put in a new plug and it purred like it always had. So YZ timing definatly affects jetting in my book.
Posted March 26, 2003 - 06:40 AM
Seems to me that if you changed to YZ timing and it ran like crap, changed back to WR timing and it still ran like crap, changed the plug and all is well. You had a bad plug during your YZ timing run. Don't think you should draw any conclusions other than the plug.IMO
Posted March 26, 2003 - 10:29 AM
Dont have an opinion on jetting affects based on YZ/WR timing changes...havent changed mine...havent found a need to now that it's jetted well.
Posted March 30, 2003 - 06:59 PM