 It had an 80 mm bore and the 58 mm stroke giving 583 cc, whereas the first Pantah based racer, the 600 cc TT2 racer used 81 mm) The last of the 600SL bikes had MHR paint.The styling of the 1982 600TL proved unpopular, and the model lasted only until 1983.In 1983 the 650SL was produced to homologate the TT1 750 racer’s 61.5 mm stroke.