1993 XR600R having issues, nothing detrimental, but just enough to really, irritate the hell out of me. Ok, so this is gonna be long winded, but bear with me, I wanna make sure I provide as much info as possible. So, here's the deal, I just finished rebuilding the top end completely: rings, cam, rockers, valves, the whole nine yards. Everything went back together smoothly, and it runs great, but it is unbelievably hard to start now. Before, first or second kick everytime, whether it was 40 degrees or 90. Now it takes 20-25 kicks, using the decompressor intermittently, to get it to even start to think about running and it won't start at all with the choke on. Its got to be some sort of carb issue, but I'm at my whits end trying to figure out what. I mean, I did nothing to the carb during the rebuild, and everything ran fine before? It runs great once its warmed up, idles fine and has great power. I did have to jet it up after the rebulid, with a Mikuni flatside, non-pumper, it came with a 240 main jet, but with that after the rebuild it was popping on decel. So, its up to a 270 now and its not popping anymore. But, there is one more issue, I race it alot and in order to pass the sound test, I'm always right on the line and the ranger will always say, "you know that popping is why its so close, if you get it jetted right, it won't do that and you wont have any problem passing." So, what I'm saying is when I open the throttle up about half way, under no load, it wants to pop a little even still. Does anyone have any idea where I should start? I haven't had the carb apart in a while, I suppose that would be a good place to start, but I wanna see if there's anything obvious I'm missing before I tear the whole thing apart.