Originally Posted by Roelof

A loose sleeve wil have some space for expansion. I had some JP Kangaroo 2003 teamspec engines and bothe sleeves were very easy to take out and both were running great. I think whent the temp is going higher on high RPM with a tight sleeve the piston will expand, the sleeve not and so there will be friction and wear on the piston. When the sleeve will expand with it it will give the piston a better room.