I've had this bike since the beginning of the year and it always started and ran pretty good. I got a 2003 yz450 exhaust cam really cheap for easier starting and it went in with just a valve shim change. The valves were in spec on the intake and exhaust. 1.76 and 1.78 to 1.95 and 2.00. Got it together and checked timing and then checked again. When I started it up with the choke, it would run but never could get it to start or idle without the choke. Maxed out the throttle stop screw and still dies. I checked the jets and cleaned them. 45 pilot, 178 main and 65 starter. The pilot screw was already at a bit over 3 turns out. Pulled it out and checked to see if the o ring and washer were on. Checked out ok. Accelerator pump looks good. The hot start button is somewhat bent near the end of the shaft so I pulled it off and tried it with the hose blocked. I couldnt blow through the valve with it closed anyways. Unplugged the TPS. The thing doesn't want to idle. Any suggestions? A new plug and probably going up a size on the pilot would be where I'd go next. I ride at sea level and around Hollister Hills. It has a white brothers e-series header and silencer. Just wondering if anyone has any ideas. I've been enjoying reading the tech stuff here for some time now but never had a reason to post before now.