I had rd ypvs 2 1987-1989 and i drove over 20000 Km/year. After every 15000 km i change piston rings ( plus normal service of course) and i didnt had any problems. And here in finland temperature changes are very bigs during the season. -5 to +30 celsius degrees. Rd is very nice bike if you dont travel. its perfekt bike to play. Check www.planbee.org