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Message: [QUOTE="mountain, post: 241821, member: 27629"] I just want to confirm what I am doing is right..... I have a 2000, XR400. I put a Unifilter in and removed the airbox snorkel. I have removed the baffle inside my muffler, and I have a high-flow muffler tip which users the turbine style spark arrestor (which is an awesome idea, as this has a big 2-3 inch hole with NO screening . The turbine flow catches the sparks instead of a screen, which allows tons of flow). I have aslo heard about grinding down the welding beads inside of the header pipes to increase flow there as well, and I definitely plan on doing this too. So....I figure that my 400 will be breathing pretty darn good w/ these mods. Now for the jetting, to make sure I'm not runnin too lean..... I have heard from some people that a 60 pilot and a 160 main jet are the sizes to use for this setup. (FMF website even recommends 62/162 with their pipes and snorkel removed). BUT, a few other people have told me that 160 main sounds really big. Too big. A guy I talked to at a race this weekend only went to 145 main with nearly the same setup as mine..... I ride in Texas, and it's HOT here in the summer, making me run richer, right? Should I go smaller in the summer? What size? I will definitely be checking my plugs when I re-do the jetting to check myself, but I just wanted some input from you guys as to your first hand experience w/ your trials and tribulations. 1) Is 60/160 too rich for my setup right now? If so, what are you guys runnin? 2) Should I expect 60/160 to really change/ get too rich in the summer months? If so, how what sizes should I go to. 3) I hear the 60 pilot will help w/ starting. What have any of you guys noticed that have gone to a 60 pilot? Thanks very much for your input..... Josh:think [/QUOTE]

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