Thanks for looking into this thread. Posted a message in the mini-bike forum and got no replys. My 10 yr old son got a Suzuki DS 80 to ride with me this spring. He learned the ropes quickly this fall, and can move through the gears efficiently enough for the yard. A bit more practice and we hit the trails. The bike is a 1980, and is in good shape, ran well, just a few small repairs. This winter I would like to go over the entire engine to ensure a fun breakdown free spring. Never did a top end and don't know what to look for. Can anyone give me some advice as to where to begin and what to look for. I have done a great job maintaining my 2001 kdx, have the tools, etc., I'm ready to get the DS ready. Thanks and Merry Christmas in advance.