so i bought my bike about 5 months ago and just this last month had to have it rebuilt. turns out it has an andrews cam s&s rods and wiseco pistons. the guy i bought it from tore the motor down and sandblasted the cases but the dumb ass forgot to clean the sand out before he put it back together WTF right. the good thing is not to much is messed up but still. how many people has this happened to and how do you go about checking for this if you are buying a used bike. does feeling the oil help?