Ok so i was riding my 2010 ninja 250r this afternoon, it only has 298 miles on it, I was driving around 40-45 mph when i noticed a sound coming from the back tire, So i turned around and headed for home to investigate. I noticed that my chain was about 3 to 3 1/2 inches loose/ or slack, It was rubbing on the arm. So i read my manual and did everything it told me to do, as i was tightening the chain bolt=Very little pressure the bolt snapped and broke. Any idea's the price it will be to fix this? and with the amount of pressure i put on it could it be a manufactures default?