ok so started to take my bike in because it is acting funny but noticed a glob of crap on the block just behind the front sprocket cover. Turns out the previous owner sold me a bike with horribly jb welded, cracked block. So instead of living with it and paying some one to fix my current problem I am just going to replace the motor. Does anyone know of any good places to get a motor from and how much should I expect to pay? I have a 2003. Thank you for any help.