have to agree wif nismo... Rpm is more impt that speed... used
to have tzm(1st hand) and the manual say that for the 1st 500km or
something... rpm should not be above 5000...
>500km, rpm not more than 6000
>1000km, can open the damn valve liao... 
juz imagine that u riding at 5000rpm and your speed is oni 60km/h

correct me if i'm wrong, at 5000rpm using lowest gear, speed should
be ard 80-90km/h, rite?