I bought an old TT600 from 1987 a couple of years ago. It sounded real bad and it was the nut on the primary gear that was loose! It had sheared the key almost completely off! I bought a new key and new washers and used locktite as well. After assembly it was OK! I checked the ignition and pulled the flywheel; the timing was one tooth off and one slipper blade was dislocated. Before taking a trip around the world I would check up such things on a TT or XT. My TT used a bit of oil and it was the rings that where worn. I have fitted new rings and valve seals now. The cylinder bore and piston was very good so no rebore was nessesary.
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