Last week, I had my 00 426 torn down changing the oil and checking valve clearance. I reassembled the bike, gave 'er a test kick, and it fired right up no problems. It was popping a bit though, so I decided to remove the carb and clean it out. I pulled the carb, removed all the jets, the slider, the needle, etc., blew out all the carb passages with compressed air, reinstalled everything, and reinstalled the carb. I also installed a fuel filter after finding some grungy buildup in the top housing you remove to take out the slider and needle. After reinstalling the carb and installing the fuel filter, my bike will not start. When I first turned the fuel on, a little ran out the float bowl overflow hose then stopped. The thing only ran for a few seconds, and only with the throttle half open. Once I let off the throttle, it died. I tried a variety of things to get it to start, including opening up the throttle. It started with the hot start pulled open. Also, it would temporarily lose compression. I was able to kick it through 3-4 times without full compression. There was still some compression, but it was constant, and not enough to stop the piston at TDC, and there was no need for the compression release. Flicking the comp release lever a few times seemed to fix this problem, but it would come back. There was no regular pattern to the compression loss. I am at a complete loss and need some help! If its any help at all, I've got a 162S main (S for stock???), 42 pilot, and all other jets are stock. I started out with the fuel screw at 2-3/4 turns out, then backed it down to 1-1/2 turns. The bike has fresh Mobil 1 15-50 (red cap) in it- it has only been run about 2-3 minutes since an oil/filter change. Please help! I have no idea what is happening, and its starting to worry me.