Posted June 23, 2001 - 05:48 AM
Fitzy, I have the same version of the WR426 that you have that came with that Euro/Canadian muffler. I bought my pipe from Pro-Curcuit at a race for a discount (not really) and had them install it. They told me not to change my jetting at all and to leave it stock, I too ride at sealevel. But like most guys I wanted to make sure that I was getting the most out of my bike so I tried every combo of main and pilot jets and different clip positions only to find out that nothing worked for me, I mean I foulded plugs, the bike popped and spat up and never wanted to start. Alot of guys on this site have spent countless hours of testing different configurations for the bike and for the life of me I can't get my bike to work any better than stock!!
Best of luck to you!!