You didnt do bad..To rebuild the motor would cost $400 or more depending on who does it..You should be able to find a copy of the original owners book, but they are pretty much UNHELPFUL (thanks sears) to help you out...they just give you the convidence the screw it up (trust me I know)...but check in the yahoo groups, their are service books for the engines in some of them groups, and those are more helpful...