ORIGINAL: caseyddr
definately not why.
The reason is because if you dont have it at BDC after running (break in or regular running) if the piston is at TDC or near, the sleeve could lose its pinch by cooling around the piston, ruining your new engine.
Exactly, it helps when you are heat cycling the engine during break-in. Heat cycling is the heating and cooling of the engine to properly seat the sleeve in the cylinder, and the piston in the sleeve.
Casey, maybe you should read and understand a post before saying someone is wrong. I did not feel a need to get into the particulars since it is explained in the newbie FAQ.