.   Some theorize

that
breaking in a piston engine "hard" produces better ring to cylinder seal
and
a motor which will produce more hp than a "lazily" broken in motor.
This
theory is pretty popular in the sportbike community presently.

Marc, Most tuners now use a dfferent set-up. I built bike engines for some time, and the last
set-ups, also used by most of the auto tuners is to hone the cylinder as round as possible and to
use a VERY fine hone. Often the final is 600 stones or finer. This is almost polished with very
few hone marks. The engine is assembled nearly dry. The rings seat instantly or not at all. The
tip seals of the rotary do break into the surface, but it is highly polished so break in is
dependant on the compatability of the materials used. Don't forget the tip seals are thrown rather
hard by the centrifugal force in the rotary. If the materials aren't right they would wear out
fast!  Bill Jepson

 
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