I have a piston and sleeve that is so tight that even after running in 3/4 a gallon, is so tight that I have to take the engine apart to get it unstuck. Any Ideas? Idle temps for running in has been from 170 to 205.....

The piston keeps getting stuck and when I remove it, it has a sticky film on the sides of the piston, and to get it to start up again, I have to clean the film off the sides of the piston....I've done this 3 times and I'm about to toss it to the side.

thanks