GasGas 125 Pampera speed question

[solo_gg]

I'm helping a buddy with a 2007 125 Pampera (like this; I assume that's an enduro?). It sat for a while, so we've cleaned the carb, spark plug, and the air filter. It runs smooth at idle, but I took it for a run and it tops out at 60 km/h (~ 40 mph) at redline in 5th... I'm thinking it should be good for a bit more speed. Is that normal (I'd love to hear from other owners what speeds they get)? If it's not, does anyone have any ideas what could be wrong? Are we dealing with ridiculously low gearing? Thanks for any suggestions,

Paul