Overheating in 1 cylinder?

[bendemay]

I have a 97 1100 stx(3seater) and it has been blowing off the water flush fitting and then it would pump sea water into itself. I pulled the head off and blew the cooling sleeves with compressed air and then I put it together again. When I run the enging in my driveway with water going threw it the middle and fron cylinders are reletivly cool, and the back one keeps on getting hotter and hotter. But when I plug the overflow with my finger, it starts to cool down. I have no idea what the problem is, any input would be great.


Also, I think the fuel gauge sensor may be bad because it never gives the right reading, I dislike the digital gauge.



Ben