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87' XR250 help

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I've got an 87 xr250r that I just got rebuilt. I have pulled the baffle, installed a uni fileter/cage, pulled the snorkel and had it bored .20 over. The bike starts first kick and runs good until it warms up. Then it will run ok off idle and on the main jet. However right from 1/4 throttle to 3/4 throttle the bike sputters and goes no where. It smokes a bit still(blue), but it's not broken in yet. I had the valves done and all. It's got a 125main and a 40 pilot(stock). Could this just be a float issue when hot or air/fuel screw? I'm wondering when hot if it's lean or what? Any help?

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