So - My 89 TW has been sitting for over two years, victim of the eBay carb kit that is full of worms! Well I've finally got some time (and got OEM Yamaha parts) to correct the cheapo carb kit's disaster. Everything has gone smooth, but right after I took the valve seat screw off, I ran into a difficult problem. For whatever reason I cannot get the valve seat to come out. My guess is the cheap rubber gasket the carb kit came with has become like glue inside the carb body. I've been soaking and soaking now, for 24 hours. Not even vice grips can get this thing out. I'm starting to think I might be in big trouble, as in, have to buy a used carb... Any suggestions?