I recently just installed new top end, including new piston,rings,SS valves, guides,seals and SS springs. While apart I also removed and cleaned the carburetor. It doesn't even attempt to start while using the choke. It will try to start using the hot start knob, but only for about 2 seconds then it dies. After trying to start for a while, I pulled the plug to check the spark and also the condition of the plug. I have spark and I also noticed the spark plug is dry as a bone. The AP seems to be working ok as it squirts fuel through the carb when the throttle is turned. The timing is correct as stated in the manual and the valve clearances, after installing new shims are close to nominal on both intake and exhaust. The engine cranks over like normal and the decomp also seems to be functioning as it's supposed to be. Any help would be greatly appreciated. Thanks.