The answer would be yes. In many cases motors do not break in properly, with respect to the piston rings and cylinder bores. In most cases it is the ring packs that get fowled during break in. A combination of high heat and metal wear, as the rings seat or mate with the cylinder walls, can result in lower than desired compression in one or more cylinders. When this occurs the over all performance of the motor is less than optimal. And the long term life of a motor is compromised.
There is a test performed on a Harley V-Twin engine that did not break in properly, up on the Auto-Rx web site, which is a good read.
Cleaning up the rings and lands with ARX gave this motor A SECOND CHANCE AT A PROPER BREAK IN.
