Just bought a registered 'repaired wreck' GS500. All good except for dent in tank and no tacho. Might get a tacho down the track if I find a cheap one, meanwhile could a GS500 owner give me an idea what speed the bike does in the top 4 gears at say 5000 rpm? Then I know I'm safe at up to double that speed! Also chasing an owners and/or workshop manual. It had 3900ks when I bought it, so assume it had the 1000km service. When are the next few oil/filter changes due, and what type of oil is recommended. Thanks!! David.