Hello all... This is my first post, but I'd like you all to know I've already learned a lot about my machine from your past discussions using the search feature. I just purchased a 2000 XR650L with a White Bros. E-Series pipe. The previous owner said the local Honda shop had re-jetted it for him, but it was obviously burning way too rich. I checked the air filter, it was the stock filter and totally plugged up. I got it home and removed the smog pump to get rid of the popping, ripped the snorkel off the air box, and opened up the carb to check what jetting I had. I have a 152 main, 55 pilot, and it appears to be a stock needle (J8KC). Now for my questions: I will be ordering an Uni foam filter and riding between 800' and 3500' elevation. What main jet should I pick up 160 or 165? There is a plastic stepped washer under the needle now, is this stock or somebodys attempt at shimming the needle? Do I add a .035"-.040" washer in addition to the plastic washer? I will also be drilling the slide out to 5/32". The WB pipe is too loud for me, will the WB silencer add on tip help much? Thanks, Bill P.S. Almost forgot, I'll be grinding the tab off the bowl to be able to adjust the air screw. Where should it be set? It was at 2 1/2 turns out.