Any reason why the piston and sleeve on my engine would all of a sudden tighten up when it was loose before? My engine roughly gone through around 3/4 gal of fuel and should be fully broken in. Previously when taking the head off and turning the crank over, theres little to no resistance from the piston reaching TDC. But after the session this past weekend, I turned the engine over again while the head is off and felt quite of bit of resistance when the engine reached TDC.

Not sure how something being loose before can suddenly be tight. I just hope I didnt mess anything up with the engine and warped the piston/sleeve.