Hi everyone this is my first post but I have been reading this forum for a while now. The most useful info on the web. I just bought an 04 xr400R and I couldn't be happier. When I got it, it was running wierd and took several kicks to get it running. I started reading a lot on here and figured rather then buying a rebuild kit, I'll just buy a mikuni pumper for the power increase and ease of starting. I ordered from xr's only and had to email them because I never got the package. They told me carbs were on back order, so I went a head and pulled the stock carb apart. I cleaned everything several times and set the float height dead on. Wow I couldn't beleieve it the bike starts first kick weather its hot or cold and even if you dump it. Most of the time it will stay running when you dump it. Now thats why I bought a honda, cause they're reliable and user friendly. Anyways, I e-mail xr's only to tell them they can keep they're carb, I'll sacrifice the power increase for a bike that runs this great! Two day's later they send me an e-mail back saying they just sent out the carb. I pondered for weeks weather to put it on or send it back, and I figured just put it on, I've heard lots of good things about the Mikuni. Now my bike starts like crap! It will start in 2 to 4 kicks with the choke/start circuit on, but takes probably 10 or more kicks to start when its hot. The pilot screw runs best at 1 to 1.5 turns out. I saw lots of threads on here similar to this one, but none that said its hard to start hot. Anyone have any advice before I put the old carb back on? Other then starting, it runs pretty good. I don't feel like it idles as smooth as the old carb, but when you pin the throttle, you can't keep the front wheel down!