let me guess... you got it new and took it very easy, in case it was damaged as you broke it in?
experience shows that gentle breakins cause damage.
if you load them down, run them at full throttle with the brakes on so hard it can barely rev, the rings actually get a chance to bed into the cylinder bore. after letting them idle to a warm up...without feeling the urge to blip the throttle like most people do when starting an engine.
just start it, let it idle by itself til warm...then load it up as much as possible.
this only takes about ten minutes, tops. after that...use it as normal.
if any thing DOES break at this point...you got a lemon. look at the warranty card.
then you dont get any nasty blowby products contaminating your oil. your piston skirt remains clean. power is increased as compression is retained... the engine lasts longer. the valves tend to seat in better, the cylinder hone marksare smoothed off but remain, retaining oil and keeping the rings/skirt lubed up. blah blah, yarda yarda.
also, replace the oil at least 3 times in the first few hours of operation. dont bother with synthetics, just plain old 30W engine oil. especially on the initial break in!
ten minutes of aluminium and steel filings will destroy things, so imagine what 5 hours of gunk can do.
after all the shiny glitter stops coming out...its good to leave and change every 25 hours or so.