Hello all, Newbie to the fourm. I just purchased a couple bikes and have a question about one of them. I scored a Roketa 200cc at a garage sale for $50.00 The seller bought it for his kid for Xmas and the motor seized up after a couple days of riding. Needless to say he sold it to me at his garage sale. I pulled the motor and found a nut floating on top of the piston that was wedged to the wall of the head next to the valve. Weird huh! Anyways it looks like I can smooth out the gouge in the head and on top of piston and put everything back together. My question is what are the torque settings for the head bolts and is there a site where I can buy a new head if I need to? Thanks for all your help.