i have a 1999 90 yamaha and recently have had enginge problems.half power and wont start and evrything in between.i took of the carbs and cleaned them.when i went to fill up the carbs,i was pumping the bulb and gas started pouring out of my exuast.the top carb wasnt even getting gas.<br />I took apart the carbs again and clean the needle valves really good.but i cant get the bulb hard.gas pours out the exaust..please anything i should try.?