well i flushed the oil gas tank out before i did anything.....then i had to remove all the fuel rubber hose that some guy used to bypass the regular solid fuel line......nothing but clean fuel coming out of gas tank now........well after soaking the valve in mystery oil yesterday i still cant move the valve.........my next step is heating up the head around the #4 intake valve and try to move it..........if that fails then i am going to have to remove the head.......that stuck valve is being a pain in my rear...........